ZIP codes and county lines in Missouri

468 of the 1040 ZIP code areas in Missouri, or 45.0%, overlap more than one county. If your territories, tax rules or service areas are set by county and your list is by ZIP, these are the rows where the two disagree.

ZIP code areas: 1,040
In more than one county: 468
At least 5% in a second county: 379
Cross a state line: 9

How Missouri compares

Missouri ranks 10 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 115 of its counties have at least one split ZIP code area along an edge. 9 of its ZIP code areas also reach into Arkansas, Iowa and Illinois, so a ZIP list that is meant to stop at the state line does not.

Counties with the most split ZIP code areas

Christian County: 18 ZIP codes shared with another county
St. Louis County: 17 ZIP codes shared with another county
Johnson County: 16 ZIP codes shared with another county
Lawrence County: 16 ZIP codes shared with another county
Douglas County: 15 ZIP codes shared with another county

Every split ZIP code area in Missouri

Each row is one ZCTA and the counties its land falls in, largest share first. Counties in another state are marked with that state. Sort by the share outside the main county to put the most evenly divided ones first.

	Share of land by county
51640	Fremont County, IA 81.9% Atchison County 18.1%	18.1%	2
52542	Van Buren County, IA 80.5% Scotland County 19.5%	19.5%	2
52573	Van Buren County, IA 65.3% Clark County 23.8% Scotland County 10.9%	34.7%	3
52626	Lee County, IA 54.5% Van Buren County, IA 23.9% Clark County 21.6%	45.5%	3
63005	St. Louis County 97.3% Franklin County 2.7%	2.7%	2
63014	Franklin County 97.6% Gasconade County 2.4%	2.4%	2
63015	Franklin County 64.5% Jefferson County 35.5%	35.5%	2
63020	Jefferson County 93.5% Washington County 6.4% St. Francois County under 0.1%	6.5%	3
63025	St. Louis County 57.5% Jefferson County 42.5%	42.5%	2
63026	Jefferson County 50.5% St. Louis County 49.5%	49.5%	2
63028	Jefferson County 83.2% Ste. Genevieve County 16.3% St. Francois County 0.6%	16.9%	3
63030	Washington County 93.8% Jefferson County 6.2%	6.2%	2
63036	St. Francois County 74.9% Ste. Genevieve County 25.1%	25.1%	2
63037	Franklin County 98.6% Gasconade County 1.4%	1.4%	2
63041	Franklin County 97.5% Jefferson County 2.5%	2.5%	2
63049	Jefferson County 80.4% St. Louis County 19.6%	19.6%	2
63068	Franklin County 96.2% Gasconade County 3.8%	3.8%	2
63069	Franklin County 43.1% St. Louis County 33.2% Jefferson County 23.7%	56.9%	3
63072	Franklin County 96.9% Jefferson County 3.1%	3.1%	2
63080	Franklin County 56.6% Washington County 39.3% Crawford County 4.0%	43.4%	3
63087	St. Francois County 91.2% Jefferson County 8.8%	8.8%	2
63091	Gasconade County 79.6% Franklin County 20.4%	20.4%	2
63105	St. Louis County 95.7% St. Louis city 4.3%	4.3%	2
63117	St. Louis County 94.4% St. Louis city 5.6%	5.6%	2
63119	St. Louis County 99.1% St. Louis city 0.9%	0.9%	2
63120	St. Louis city 93.6% St. Louis County 6.4%	6.4%	2
63123	St. Louis County 95.0% St. Louis city 5.0%	5.0%	2
63125	St. Louis County 98.5% St. Louis city 1.5%	1.5%	2
63130	St. Louis County 98.0% St. Louis city 2.0%	2.0%	2
63133	St. Louis County 99.1% St. Louis city 0.9%	0.9%	2
63136	St. Louis County 96.0% St. Louis city 4.0%	4.0%	2
63137	St. Louis County 85.2% St. Louis city 14.8%	14.8%	2
63138	St. Louis County 99.0% St. Louis city 1.0%	1.0%	2
63143	St. Louis County 74.3% St. Louis city 25.6%	25.6%	2
63333	Montgomery County 92.9% Lincoln County 7.1%	7.1%	2
63334	Pike County 94.9% Lincoln County 5.1%	5.1%	2
63343	Lincoln County 92.6% Pike County 7.4%	7.4%	2
63344	Pike County 53.1% Lincoln County 46.9%	46.9%	2
63348	St. Charles County 78.4% Warren County 19.5% Lincoln County 2.1%	21.6%	3
63349	Lincoln County 90.8% Warren County 9.2%	9.2%	2
63351	Warren County 54.9% Montgomery County 45.1%	45.1%	2
63352	Audrain County 89.6% Ralls County 10.4%	10.4%	2
63357	Warren County 96.2% St. Charles County 3.8%	3.8%	2
63359	Pike County 52.6% Montgomery County 36.3% Audrain County 8.2% Lincoln County 2.9%	47.4%	4
63361	Montgomery County 76.0% Callaway County 24.0%	24.0%	2
63363	Montgomery County 96.2% Warren County 3.8%	3.8%	2
63381	Warren County 34.3% Montgomery County 32.9% Lincoln County 32.8%	65.7%	3
63382	Audrain County 47.6% Ralls County 41.0% Pike County 11.3%	52.4%	3
63383	Warren County 97.3% Lincoln County 2.7%	2.7%	2
63384	Montgomery County 82.3% Audrain County 13.2% Callaway County 4.5%	17.7%	3
63390	Warren County 87.8% Lincoln County 12.2%	12.2%	2
63401	Marion County 50.1% Ralls County 49.9%	49.9%	2
63432	Scotland County 87.6% Clark County 12.4%	12.4%	2
63435	Lewis County 68.0% Clark County 32.0%	32.0%	2
63437	Shelby County 86.8% Monroe County 8.5% Macon County 4.7%	13.2%	3
63438	Lewis County 68.1% Marion County 31.9%	31.9%	2
63439	Shelby County 72.3% Marion County 27.7%	27.7%	2
63440	Lewis County 72.1% Marion County 25.6% Shelby County 2.3%	27.9%	3
63441	Pike County 90.2% Ralls County 9.8%	9.8%	2
63443	Monroe County 48.8% Shelby County 33.2% Marion County 17.9%	51.2%	3
63446	Knox County 91.9% Lewis County 8.1%	8.1%	2
63447	Lewis County 95.6% Knox County 4.4%	4.4%	2
63450	Shelby County 56.4% Monroe County 43.6%	43.6%	2
63451	Shelby County 90.4% Knox County 9.6%	9.6%	2
63454	Marion County 71.6% Lewis County 28.4%	28.4%	2
63456	Marion County 39.3% Ralls County 33.8% Monroe County 26.9%	60.7%	3
63459	Ralls County 92.0% Pike County 8.0%	8.0%	2
63462	Ralls County 58.7% Monroe County 41.3%	41.3%	2
63468	Shelby County 62.1% Monroe County 37.9%	37.9%	2
63469	Shelby County 97.1% Knox County 2.9%	2.9%	2
63471	Marion County 78.8% Lewis County 21.2%	21.2%	2
63473	Lewis County 52.1% Clark County 47.9%	47.9%	2
63474	Clark County 93.8% Scotland County 4.3% Lewis County 1.9%	6.2%	3
63531	Knox County 53.6% Scotland County 46.4%	46.4%	2
63533	Adair County 91.2% Knox County 8.8%	8.8%	2
63534	Macon County 98.0% Randolph County 2.0%	2.0%	2
63535	Schuyler County 68.3% Putnam County 31.7%	31.7%	2
63536	Schuyler County 55.1% Scotland County 44.9%	44.9%	2
63544	Adair County 45.1% Sullivan County 42.9% Putnam County 12.1%	54.9%	3
63546	Adair County 64.9% Schuyler County 33.1% Scotland County 2.1%	35.1%	3
63547	Knox County 88.9% Adair County 11.1%	11.1%	2
63549	Macon County 68.4% Adair County 29.3% Knox County 2.3%	31.6%	3
63557	Linn County 66.3% Macon County 21.3% Adair County 9.2% Sullivan County 3.2%	33.6%	4
63558	Macon County 68.7% Chariton County 31.3%	31.3%	2
63559	Adair County 88.3% Putnam County 11.7%	11.7%	2
63560	Sullivan County 87.2% Putnam County 12.8%	12.8%	2
63563	Knox County 51.9% Scotland County 48.1%	48.1%	2
63565	Putnam County 98.3% Sullivan County 1.7%	1.7%	2
63566	Linn County 61.0% Sullivan County 39.0%	39.0%	2
63620	Iron County 68.5% Madison County 20.8% Reynolds County 10.7%	31.5%	3
63621	Iron County 68.7% Madison County 31.3%	31.3%	2
63624	St. Francois County 54.7% Washington County 29.2% Iron County 16.1%	45.3%	3
63625	Reynolds County 82.0% Iron County 18.0%	18.0%	2
63626	Washington County 81.4% St. Francois County 18.6%	18.6%	2
63627	Ste. Genevieve County 94.2% Jefferson County 5.8%	5.8%	2
63628	St. Francois County 84.0% Ste. Genevieve County 7.8% Washington County 6.3% Jefferson County 2.0%	16.0%	4
63629	Shannon County 48.0% Reynolds County 32.7% Dent County 19.3%	52.0%	3
63630	Washington County 93.3% St. Francois County 6.7%	6.7%	2
63631	Washington County 64.5% Iron County 35.5%	35.5%	2
63636	Iron County 46.0% Wayne County 30.5% Madison County 23.5%	54.0%	3
63638	Reynolds County 82.0% Shannon County 18.0%	18.0%	2
63640	St. Francois County 66.1% Ste. Genevieve County 33.9%	33.9%	2
63645	Madison County 87.4% St. Francois County 8.3% Ste. Genevieve County 4.3%	12.6%	3
63648	Washington County 92.6% St. Francois County 7.4%	7.4%	2
63650	Iron County 75.4% St. Francois County 21.5% Madison County 3.0%	24.6%	3
63654	Reynolds County 98.8% Iron County 1.2%	1.2%	2
63655	Madison County 65.8% Bollinger County 22.3% Wayne County 12.0%	34.2%	3
63656	Iron County 50.9% Reynolds County 49.1%	49.1%	2
63673	Ste. Genevieve County 49.5% Perry County 30.2% Randolph County, IL 20.3%	50.5%	3
63730	Stoddard County 54.6% Bollinger County 33.9% Cape Girardeau County 11.5%	45.4%	3
63732	Perry County 62.2% Cape Girardeau County 37.8%	37.8%	2
63735	Stoddard County 89.5% Scott County 10.5%	10.5%	2
63740	Scott County 50.2% Cape Girardeau County 49.8%	49.8%	2
63764	Bollinger County 97.7% Cape Girardeau County 2.3%	2.3%	2
63766	Cape Girardeau County 67.4% Bollinger County 32.6%	32.6%	2
63770	Perry County 53.4% Cape Girardeau County 46.6%	46.6%	2
63771	Scott County 73.3% Stoddard County 25.0% Cape Girardeau County 1.7%	26.7%	3
63775	Perry County 97.6% Bollinger County 1.3% Cape Girardeau County 1.2%	2.4%	3
63780	Scott County 96.9% Cape Girardeau County 3.1%	3.1%	2
63781	Bollinger County 99.0% Perry County 1.0%	1.0%	2
63785	Cape Girardeau County 97.4% Bollinger County 2.6%	2.6%	2
63787	Bollinger County 95.4% Wayne County 4.6%	4.6%	2
63801	Scott County 57.9% New Madrid County 29.8% Stoddard County 11.0% Mississippi County 1.3%	42.1%	4
63822	Stoddard County 92.1% Dunklin County 7.9%	7.9%	2
63823	Mississippi County 82.3% Scott County 17.8%	17.8%	2
63833	New Madrid County 53.1% Stoddard County 46.9%	46.9%	2
63834	Mississippi County 85.0% Scott County 15.0%	15.0%	2
63837	Dunklin County 72.4% New Madrid County 27.6%	27.6%	2
63845	Mississippi County 86.4% New Madrid County 13.6%	13.6%	2
63848	New Madrid County 83.6% Pemiscot County 16.4%	16.4%	2
63849	Dunklin County 84.7% Pemiscot County 15.3%	15.3%	2
63852	Dunklin County 86.9% Pemiscot County 13.1%	13.1%	2
63857	Dunklin County 97.1% Pemiscot County 2.9%	2.9%	2
63863	Dunklin County 72.0% New Madrid County 28.0%	28.0%	2
63870	New Madrid County 64.2% Stoddard County 35.8%	35.8%	2
63873	New Madrid County 68.7% Pemiscot County 31.4%	31.4%	2
63877	Pemiscot County 94.1% Dunklin County 5.9%	5.9%	2
63935	Ripley County 92.5% Oregon County 6.7% Carter County 0.8%	7.5%	3
63937	Carter County 78.5% Butler County 14.1% Wayne County 7.3%	21.5%	3
63941	Carter County 66.3% Oregon County 32.9% Ripley County 0.7%	33.7%	3
63942	Ripley County 71.7% Oregon County 28.3%	28.3%	2
63943	Carter County 71.7% Ripley County 28.3%	28.3%	2
63945	Butler County 89.6% Ripley County 10.4%	10.4%	2
63953	Ripley County 82.3% Butler County 17.7%	17.7%	2
63954	Butler County 93.6% Ripley County 6.4%	6.4%	2
63957	Wayne County 75.7% Reynolds County 24.3%	24.3%	2
63960	Stoddard County 92.0% Bollinger County 8.0%	8.0%	2
63964	Wayne County 95.3% Madison County 4.7%	4.7%	2
63965	Carter County 97.2% Reynolds County 2.8%	2.8%	2
63966	Wayne County 78.5% Butler County 21.4%	21.4%	2
63967	Wayne County 69.7% Butler County 30.4%	30.4%	2
64011	Lafayette County 79.5% Johnson County 20.5%	20.5%	2
64017	Ray County 59.4% Lafayette County 40.6%	40.6%	2
64020	Lafayette County 73.3% Johnson County 22.4% Saline County 4.2%	26.7%	3
64024	Clay County 62.8% Ray County 37.2%	37.2%	2
64034	Jackson County 80.5% Cass County 19.5%	19.5%	2
64035	Ray County 96.0% Carroll County 4.0%	4.0%	2
64037	Lafayette County 97.2% Johnson County 2.8%	2.8%	2
64040	Johnson County 99.1% Cass County 0.9%	0.9%	2
64048	Clay County 63.3% Clinton County 36.7%	36.7%	2
64061	Johnson County 83.9% Cass County 15.5% Jackson County 0.6%	16.1%	3
64062	Ray County 73.2% Clay County 13.5% Clinton County 11.0% Caldwell County 2.3%	26.8%	4
64070	Jackson County 82.4% Johnson County 17.6%	17.6%	2
64075	Jackson County 90.9% Lafayette County 9.1%	9.1%	2
64076	Lafayette County 89.7% Johnson County 10.3%	10.3%	2
64077	Ray County 90.1% Clay County 9.9%	9.9%	2
64080	Cass County 97.0% Jackson County 2.6% Johnson County 0.4%	3.0%	3
64082	Jackson County 90.8% Cass County 9.2%	9.2%	2
64089	Clay County 73.3% Platte County 26.7%	26.7%	2
64096	Lafayette County 93.7% Saline County 6.3%	6.3%	2
64118	Clay County 98.9% Platte County 1.1%	1.1%	2
64147	Jackson County 90.1% Cass County 9.9%	9.9%	2
64150	Platte County 99.8% Clay County 0.2%	0.2%	2
64151	Platte County 99.8% Clay County 0.2%	0.2%	2
64155	Clay County 99.6% Platte County 0.4%	0.4%	2
64423	Nodaway County 97.9% Andrew County 2.1%	2.1%	2
64427	Andrew County 82.3% Nodaway County 17.7%	17.7%	2
64428	Nodaway County 86.5% Atchison County 13.5%	13.5%	2
64429	DeKalb County 32.8% Caldwell County 30.9% Clinton County 30.8% Daviess County 5.6%	67.2%	4
64430	DeKalb County 84.5% Andrew County 15.5%	15.5%	2
64437	Holt County 99.6% Atchison County 0.4%	0.4%	2
64439	Platte County 58.7% Buchanan County 41.3%	41.3%	2
64440	Buchanan County 90.6% Platte County 9.4%	9.4%	2
64441	Worth County 61.7% Gentry County 38.3%	38.3%	2
64444	Platte County 77.0% Buchanan County 18.8% Clinton County 4.2%	23.0%	3
64454	Clinton County 56.1% Buchanan County 43.9%	43.9%	2
64455	Nodaway County 91.0% Andrew County 9.0%	9.0%	2
64456	Worth County 93.9% Harrison County 6.1%	6.1%	2
64457	Nodaway County 85.5% Andrew County 14.5%	14.5%	2
64458	Harrison County 95.1% Worth County 4.9%	4.9%	2
64463	Gentry County 66.3% DeKalb County 26.0% Andrew County 7.7%	33.7%	3
64465	Clinton County 86.3% Caldwell County 13.7%	13.7%	2
64469	DeKalb County 98.3% Gentry County 1.7%	1.7%	2
64471	Harrison County 79.0% Gentry County 21.0%	21.0%	2
64474	DeKalb County 57.4% Clinton County 42.6%	42.6%	2
64475	Nodaway County 60.0% Worth County 38.1% Gentry County 2.0%	40.0%	3
64479	Nodaway County 84.3% Gentry County 15.8%	15.8%	2
64484	Buchanan County 66.4% Platte County 33.6%	33.6%	2
64486	Worth County 60.6% Nodaway County 39.4%	39.4%	2
64487	Nodaway County 75.1% Atchison County 16.3% Holt County 8.7%	24.9%	3
64489	Gentry County 77.5% Nodaway County 22.5%	22.5%	2
64490	Clinton County 59.9% DeKalb County 39.9% Buchanan County 0.2%	40.1%	3
64492	Clinton County 71.9% Clay County 21.7% Platte County 6.4%	28.1%	3
64494	Andrew County 53.1% DeKalb County 46.9%	46.9%	2
64497	DeKalb County 66.0% Daviess County 34.0%	34.0%	2
64499	Worth County 70.3% Gentry County 29.7%	29.7%	2
64505	Andrew County 77.1% Buchanan County 22.9%	22.9%	2
64506	Buchanan County 96.0% Andrew County 4.0%	4.0%	2
64507	Buchanan County 98.9% Andrew County 1.1%	1.1%	2
64601	Livingston County 99.7% Daviess County 0.3%	0.3%	2
64624	Caldwell County 49.4% Carroll County 26.3% Ray County 18.5% Livingston County 5.9%	50.6%	4
64625	Caldwell County 66.5% Daviess County 22.9% Livingston County 10.6%	33.5%	3
64628	Linn County 86.8% Chariton County 13.3%	13.3%	2
64630	Sullivan County 52.7% Linn County 47.3%	47.3%	2
64631	Linn County 68.8% Macon County 31.2%	31.2%	2
64632	Mercer County 58.6% Harrison County 41.4%	41.4%	2
64635	Livingston County 74.5% Linn County 15.4% Grundy County 10.1%	25.5%	3
64636	Daviess County 74.3% Harrison County 25.7%	25.7%	2
64637	Caldwell County 76.5% Ray County 23.6%	23.6%	2
64638	Livingston County 59.1% Carroll County 40.9%	40.9%	2
64641	Grundy County 78.5% Sullivan County 21.5%	21.5%	2
64642	Harrison County 64.7% Daviess County 23.8% Grundy County 11.5%	35.4%	3
64643	Carroll County 54.4% Livingston County 45.6%	45.6%	2
64644	Caldwell County 80.4% Daviess County 19.6%	19.6%	2
64645	Sullivan County 70.8% Mercer County 29.2%	29.2%	2
64646	Sullivan County 87.8% Linn County 12.2%	12.2%	2
64648	Daviess County 78.1% Grundy County 14.9% Livingston County 7.0%	21.9%	3
64649	Caldwell County 58.0% Daviess County 42.0%	42.0%	2
64652	Grundy County 96.8% Sullivan County 2.3% Linn County 0.9%	3.2%	3
64657	Gentry County 54.0% Harrison County 35.8% Daviess County 10.2%	46.0%	3
64658	Chariton County 75.2% Linn County 22.1% Macon County 2.7%	24.8%	3
64667	Sullivan County 38.4% Mercer County 34.5% Putnam County 27.1%	61.6%	3
64668	Carroll County 80.2% Ray County 19.8%	19.8%	2
64670	Daviess County 77.9% DeKalb County 12.2% Gentry County 5.2% Harrison County 4.7%	22.1%	4
64671	Caldwell County 60.8% Ray County 39.2%	39.2%	2
64672	Putnam County 96.1% Mercer County 3.9%	3.9%	2
64679	Grundy County 88.0% Mercer County 12.0%	12.0%	2
64681	Chariton County 93.5% Linn County 6.5%	6.5%	2
64683	Grundy County 92.1% Livingston County 7.9%	7.9%	2
64688	Livingston County 74.0% Linn County 26.0%	26.0%	2
64724	St. Clair County 63.0% Bates County 35.6% Henry County 1.4%	37.0%	3
64725	Cass County 81.9% Bates County 18.1%	18.1%	2
64726	Henry County 92.0% Johnson County 8.0%	8.0%	2
64733	Johnson County 66.0% Henry County 34.0%	34.0%	2
64735	Henry County 97.8% Benton County 2.2%	2.2%	2
64739	Cass County 71.5% Henry County 28.4%	28.4%	2
64740	Henry County 69.1% St. Clair County 30.9%	30.9%	2
64742	Cass County 69.1% Bates County 30.9%	30.9%	2
64744	Cedar County 57.3% St. Clair County 27.7% Vernon County 15.0%	42.7%	3
64747	Cass County 80.9% Johnson County 19.1%	19.1%	2
64748	Barton County 45.7% Dade County 28.7% Jasper County 18.8% Lawrence County 6.8%	54.3%	4
64750	Vernon County 89.4% St. Clair County 10.6%	10.6%	2
64752	Vernon County 53.0% Bates County 47.0%	47.0%	2
64755	Jasper County 65.3% Barton County 34.7%	34.7%	2
64756	Cedar County 76.7% Dade County 23.3%	23.3%	2
64759	Barton County 99.0% Dade County 1.0%	1.0%	2
64761	Johnson County 79.6% Henry County 20.4%	20.4%	2
64770	Henry County 83.5% Bates County 11.8% St. Clair County 4.7%	16.5%	3
64776	St. Clair County 94.3% Benton County 5.7%	5.7%	2
64779	Bates County 72.2% Vernon County 27.8%	27.8%	2
64780	St. Clair County 58.3% Bates County 41.7%	41.7%	2
64783	Vernon County 73.1% St. Clair County 26.9%	26.9%	2
64784	Vernon County 74.4% Barton County 24.1% Cedar County 1.5%	25.6%	3
64788	Henry County 74.5% Bates County 25.5%	25.5%	2
64804	Newton County 81.3% Jasper County 18.7%	18.7%	2
64832	Jasper County 60.0% Barton County 40.0%	40.0%	2
64840	Newton County 87.2% Jasper County 12.8%	12.8%	2
64842	Newton County 94.4% Barry County 5.6%	5.6%	2
64843	McDonald County 86.3% Newton County 13.7%	13.7%	2
64848	Lawrence County 98.8% Jasper County 1.2%	1.2%	2
64850	Newton County 96.1% McDonald County 3.9%	3.9%	2
64855	Jasper County 87.0% Barton County 13.0%	13.0%	2
64861	McDonald County 96.1% Newton County 3.9%	3.9%	2
64862	Jasper County 60.7% Newton County 25.1% Lawrence County 14.2%	39.3%	3
64865	Newton County 84.3% McDonald County 15.7%	15.7%	2
64867	McDonald County 62.9% Newton County 37.1%	37.1%	2
64873	Lawrence County 53.5% Newton County 46.5%	46.5%	2
65001	Maries County 73.1% Osage County 26.9%	26.9%	2
65011	Morgan County 87.0% Moniteau County 13.0%	13.0%	2
65013	Maries County 61.4% Osage County 38.6%	38.6%	2
65014	Gasconade County 69.4% Osage County 27.4% Maries County 3.3%	30.6%	3
65017	Miller County 98.6% Camden County 1.4%	1.4%	2
65018	Moniteau County 92.8% Cooper County 7.2%	7.2%	2
65020	Camden County 99.5% Laclede County 0.5%	0.5%	2
65023	Cole County 75.3% Moniteau County 24.7%	24.7%	2
65025	Moniteau County 60.9% Cooper County 39.1%	39.1%	2
65026	Miller County 97.8% Morgan County 2.2%	2.2%	2
65032	Miller County 68.3% Cole County 31.7%	31.7%	2
65034	Morgan County 75.1% Moniteau County 24.9%	24.9%	2
65037	Morgan County 87.6% Camden County 12.4%	12.4%	2
65039	Boone County 92.1% Callaway County 7.9%	7.9%	2
65040	Cole County 83.7% Miller County 16.3%	16.3%	2
65041	Gasconade County 71.0% Montgomery County 17.6% Warren County 11.4%	29.0%	3
65047	Miller County 82.8% Camden County 17.2%	17.2%	2
65049	Camden County 50.1% Miller County 49.9%	49.9%	2
65051	Osage County 99.4% Gasconade County 0.6%	0.6%	2
65058	Maries County 69.1% Osage County 18.7% Miller County 11.7% Cole County 0.5%	30.9%	4
65061	Gasconade County 51.7% Osage County 48.3%	48.3%	2
65062	Osage County 64.7% Gasconade County 35.3%	35.3%	2
65063	Callaway County 100.0% Boone County under 0.1%	under 0.1%	2
65064	Miller County 98.9% Moniteau County 1.1%	1.1%	2
65065	Camden County 87.7% Miller County 12.3%	12.3%	2
65066	Gasconade County 90.0% Crawford County 10.0%	10.0%	2
65068	Cooper County 95.1% Moniteau County 4.9%	4.9%	2
65069	Montgomery County 83.8% Callaway County 16.2%	16.2%	2
65072	Morgan County 90.7% Miller County 9.3%	9.3%	2
65074	Moniteau County 49.4% Cole County 48.6% Miller County 2.0%	50.6%	3
65076	Cole County 67.0% Osage County 33.0%	33.0%	2
65078	Morgan County 93.7% Benton County 6.3%	6.3%	2
65079	Camden County 96.4% Morgan County 3.6%	3.6%	2
65081	Moniteau County 70.2% Cooper County 21.4% Morgan County 8.4%	29.8%	3
65084	Morgan County 98.8% Moniteau County 1.3%	1.3%	2
65101	Cole County 90.5% Osage County 5.1% Callaway County 4.4%	9.5%	3
65201	Boone County 98.2% Callaway County 1.9%	1.9%	2
65202	Boone County 90.8% Callaway County 9.2%	9.2%	2
65230	Howard County 78.7% Randolph County 21.4%	21.4%	2
65231	Callaway County 97.5% Audrain County 2.5%	2.5%	2
65240	Audrain County 58.5% Boone County 36.7% Monroe County 3.4% Callaway County 1.4%	41.5%	4
65243	Randolph County 41.6% Boone County 25.9% Audrain County 24.2% Howard County 5.4% Monroe County 2.8%	58.4%	5
65254	Howard County 67.6% Chariton County 32.4%	32.4%	2
65256	Boone County 77.0% Howard County 23.0%	23.0%	2
65257	Randolph County 60.5% Howard County 39.5%	39.5%	2
65260	Randolph County 69.0% Macon County 19.1% Monroe County 11.9%	31.0%	3
65263	Monroe County 97.1% Randolph County 2.9%	2.9%	2
65264	Audrain County 71.3% Callaway County 24.3% Montgomery County 4.5%	28.8%	3
65265	Audrain County 94.3% Monroe County 5.7%	5.7%	2
65270	Randolph County 94.0% Monroe County 6.0%	6.0%	2
65279	Boone County 75.1% Howard County 24.9%	24.9%	2
65281	Chariton County 98.4% Howard County 1.3% Randolph County 0.3%	1.6%	3
65284	Boone County 85.8% Audrain County 14.2%	14.2%	2
65287	Moniteau County 53.4% Cooper County 46.6%	46.6%	2
65301	Pettis County 99.3% Cooper County 0.7%	0.7%	2
65321	Saline County 86.2% Lafayette County 13.8%	13.8%	2
65325	Benton County 98.6% Pettis County 1.0% Morgan County 0.3%	1.4%	3
65326	Benton County 83.4% Camden County 14.5% Hickory County 2.1%	16.6%	3
65327	Saline County 74.0% Lafayette County 26.1%	26.1%	2
65332	Pettis County 97.1% Johnson County 2.9%	2.9%	2
65333	Pettis County 85.2% Saline County 14.8%	14.8%	2
65335	Pettis County 54.8% Benton County 45.3%	45.3%	2
65336	Johnson County 93.3% Pettis County 6.7%	6.7%	2
65340	Saline County 96.2% Pettis County 3.9%	3.9%	2
65345	Benton County 42.3% Pettis County 39.7% Morgan County 18.1%	57.8%	3
65347	Saline County 71.2% Pettis County 23.2% Cooper County 5.6%	28.8%	3
65348	Cooper County 70.4% Morgan County 26.6% Pettis County 3.0%	29.6%	3
65350	Pettis County 86.4% Morgan County 13.2% Cooper County 0.4%	13.6%	3
65351	Saline County 82.5% Pettis County 16.0% Johnson County 1.5%	17.4%	3
65354	Morgan County 85.9% Cooper County 14.1%	14.1%	2
65355	Benton County 99.0% Hickory County 0.7% St. Clair County 0.3%	1.0%	3
65360	Henry County 32.3% Benton County 25.6% Pettis County 21.3% Johnson County 20.9%	67.8%	4
65401	Phelps County 83.0% Dent County 12.8% Maries County 4.3%	17.0%	3
65436	Phelps County 95.3% Texas County 4.7%	4.7%	2
65438	Shannon County 67.2% Oregon County 32.8%	32.8%	2
65440	Dent County 54.6% Reynolds County 40.0% Iron County 5.4%	45.4%	3
65441	Crawford County 72.6% Washington County 26.1% Franklin County 1.4%	27.4%	3
65449	Crawford County 91.5% Phelps County 8.5%	8.5%	2
65452	Pulaski County 93.3% Miller County 6.7%	6.7%	2
65453	Crawford County 88.5% Gasconade County 11.4%	11.4%	2
65459	Maries County 53.3% Pulaski County 35.8% Phelps County 5.5% Miller County 5.4%	46.7%	4
65461	Pulaski County 50.8% Phelps County 49.2%	49.2%	2
65462	Phelps County 84.8% Dent County 15.2%	15.2%	2
65463	Laclede County 92.9% Camden County 3.7% Dallas County 3.4%	7.1%	3
65470	Laclede County 88.0% Wright County 12.0%	12.0%	2
65479	Shannon County 60.5% Texas County 39.5%	39.5%	2
65534	Pulaski County 79.1% Laclede County 20.9%	20.9%	2
65536	Laclede County 93.9% Dallas County 4.6% Camden County 1.5%	6.1%	3
65542	Texas County 91.4% Dent County 7.7% Phelps County 0.9%	8.6%	3
65543	Wright County 53.4% Laclede County 46.6%	46.6%	2
65548	Howell County 60.5% Shannon County 31.8% Texas County 7.7%	39.5%	3
65550	Phelps County 92.2% Pulaski County 7.8%	7.8%	2
65552	Texas County 77.7% Pulaski County 12.2% Laclede County 10.2%	22.3%	3
65556	Pulaski County 44.1% Camden County 29.2% Laclede County 26.7%	55.9%	3
65559	Phelps County 78.8% Maries County 17.8% Crawford County 2.8% Gasconade County 0.6%	21.1%	4
65560	Dent County 79.1% Shannon County 12.4% Crawford County 5.9% Phelps County 1.8% Texas County 0.8%	20.9%	5
65565	Crawford County 81.5% Washington County 10.7% Iron County 7.8%	18.5%	3
65566	Crawford County 64.4% Iron County 35.6%	35.6%	2
65567	Camden County 79.4% Laclede County 20.6%	20.6%	2
65571	Texas County 51.2% Shannon County 48.8%	48.8%	2
65582	Maries County 97.4% Osage County 2.6%	2.6%	2
65588	Shannon County 67.6% Oregon County 32.4%	32.4%	2
65601	Polk County 66.1% Dade County 33.1% Cedar County 0.8%	33.9%	3
65604	Greene County 59.2% Lawrence County 33.0% Dade County 7.8%	40.8%	3
65605	Barry County 56.7% Lawrence County 42.1% Stone County 1.2%	43.3%	3
65608	Douglas County 93.0% Taney County 3.6% Ozark County 3.4%	7.0%	3
65609	Ozark County 71.6% Howell County 28.4%	28.4%	2
65610	Christian County 61.2% Stone County 24.0% Greene County 13.9% Lawrence County 0.9%	38.8%	4
65611	Stone County 99.2% Taney County 0.8%	0.8%	2
65612	Greene County 89.9% Lawrence County 10.1%	10.1%	2
65614	Taney County 92.8% Christian County 7.2%	7.2%	2
65616	Taney County 90.6% Stone County 9.4%	9.4%	2
65617	Polk County 63.8% Greene County 36.3%	36.3%	2
65619	Greene County 82.8% Christian County 17.2%	17.2%	2
65622	Dallas County 89.6% Polk County 10.4%	10.4%	2
65624	Stone County 51.9% Barry County 48.1%	48.1%	2
65626	Ozark County 50.3% Howell County 49.7%	49.7%	2
65630	Christian County 98.2% Taney County 1.8%	1.8%	2
65631	Christian County 66.9% Stone County 33.1%	33.1%	2
65632	Laclede County 46.8% Webster County 30.1% Dallas County 23.1%	53.2%	3
65633	Stone County 81.1% Barry County 18.9%	18.9%	2
65634	Hickory County 97.5% Benton County 2.1% Camden County 0.4%	2.5%	3
65635	Dade County 83.8% Cedar County 16.2%	16.2%	2
65637	Ozark County 61.9% Douglas County 28.7% Howell County 9.4%	38.1%	3
65638	Douglas County 80.7% Ozark County 19.3%	19.3%	2
65640	Polk County 74.2% Cedar County 25.9%	25.9%	2
65644	Dallas County 65.1% Webster County 34.9%	34.9%	2
65646	Dade County 75.4% Lawrence County 24.6%	24.6%	2
65647	Barry County 93.1% McDonald County 6.9%	6.9%	2
65648	Greene County 58.3% Dallas County 26.1% Webster County 8.1% Polk County 7.5%	41.7%	4
65649	Polk County 54.0% Cedar County 46.0%	46.0%	2
65650	Hickory County 53.0% Polk County 47.0%	47.0%	2
65652	Webster County 84.8% Christian County 13.5% Douglas County 1.7%	15.2%	3
65653	Taney County 58.1% Christian County 41.9%	41.9%	2
65656	Stone County 97.4% Barry County 2.6%	2.6%	2
65660	Wright County 81.7% Texas County 18.3%	18.3%	2
65662	Wright County 77.5% Laclede County 22.5%	22.5%	2
65669	Christian County 76.3% Stone County 23.7%	23.7%	2
65674	Polk County 43.0% Cedar County 38.3% Hickory County 11.2% St. Clair County 7.5%	57.0%	4
65682	Dade County 94.6% Lawrence County 5.4%	5.4%	2
65685	Dallas County 80.3% Polk County 19.7%	19.7%	2
65689	Texas County 76.2% Douglas County 18.9% Howell County 4.9%	23.8%	3
65692	Oregon County 58.4% Howell County 41.6%	41.6%	2
65702	Douglas County 55.5% Wright County 44.5%	44.5%	2
65704	Wright County 74.8% Douglas County 25.2%	25.2%	2
65705	Lawrence County 70.9% Stone County 29.1%	29.1%	2
65706	Webster County 99.8% Greene County 0.1%	0.1%	2
65708	Barry County 69.1% Lawrence County 30.9%	30.9%	2
65711	Wright County 51.6% Texas County 27.8% Douglas County 20.6%	48.4%	3
65713	Webster County 72.6% Wright County 27.4%	27.4%	2
65714	Christian County 93.8% Stone County 6.2%	6.2%	2
65717	Wright County 52.6% Douglas County 47.4%	47.4%	2
65720	Christian County 76.9% Douglas County 23.1%	23.1%	2
65721	Christian County 98.0% Greene County 2.0%	2.0%	2
65722	Laclede County 74.4% Dallas County 25.6%	25.6%	2
65723	Lawrence County 46.7% Newton County 35.2% Barry County 18.1%	53.3%	3
65724	Hickory County 90.6% Polk County 9.4%	9.4%	2
65725	Polk County 61.8% Greene County 38.2%	38.2%	2
65727	Polk County 99.5% Hickory County 0.5%	0.5%	2
65728	Christian County 73.1% Stone County 26.9%	26.9%	2
65729	Ozark County 88.5% Marion County, AR 11.5%	11.5%	2
65733	Taney County 85.5% Marion County, AR 8.4% Ozark County 3.1% Boone County, AR 3.0%	14.5%	4
65734	Barry County 99.6% Newton County 0.4%	0.4%	2
65735	Hickory County 63.8% St. Clair County 20.2% Benton County 16.1%	36.3%	3
65737	Stone County 84.2% Taney County 13.7% Christian County 2.1%	15.8%	3
65738	Greene County 85.6% Christian County 13.1% Lawrence County 1.4%	14.4%	3
65742	Greene County 41.8% Webster County 30.7% Christian County 27.6%	58.2%	3
65745	Barry County 81.1% McDonald County 18.9%	18.9%	2
65746	Webster County 77.0% Douglas County 14.2% Wright County 8.7%	22.9%	3
65747	Stone County 51.9% Barry County 48.1%	48.1%	2
65752	Dade County 92.1% Lawrence County 7.9%	7.9%	2
65753	Christian County 93.2% Douglas County 6.8%	6.8%	2
65754	Christian County 99.4% Stone County 0.6%	0.6%	2
65755	Douglas County 56.3% Ozark County 43.7%	43.7%	2
65757	Greene County 71.6% Webster County 28.4%	28.4%	2
65759	Taney County 97.7% Christian County 2.3%	2.3%	2
65761	Ozark County 64.9% Taney County 22.9% Marion County, AR 12.3%	35.1%	3
65767	Dallas County 67.2% Hickory County 28.8% Polk County 4.0%	32.8%	3
65769	Barry County 51.8% Lawrence County 48.2%	48.2%	2
65770	Greene County 48.5% Polk County 37.7% Dade County 13.8%	51.5%	3
65772	Barry County 69.1% McDonald County 30.9%	30.9%	2
65774	Hickory County 78.7% St. Clair County 21.3%	21.3%	2
65775	Howell County 91.1% Oregon County 5.4% Douglas County 3.5%	8.9%	3
65779	Hickory County 97.0% Benton County 3.0%	3.0%	2
65781	Greene County 89.5% Polk County 10.5%	10.5%	2
65785	Cedar County 90.4% St. Clair County 6.4% Dade County 3.2%	9.6%	3
65786	Camden County 96.4% Dallas County 3.6%	3.6%	2
65788	Howell County 91.5% Oregon County 8.5%	8.5%	2
65790	Howell County 51.8% Ozark County 48.2%	48.2%	2
65793	Howell County 57.7% Texas County 28.2% Douglas County 14.1%	42.3%	3
72644	Boone County, AR 91.1% Marion County, AR 7.5% Taney County 1.3%	8.9%	3

What to do with this

If a ZIP code in your list is split, the ZIP alone cannot tell you which county an address is in. For most work that is fine. It matters when the county decides something: a sales tax rate, a licence, a franchise agreement written by county, or a service area somebody promised by county name.

The ZIP list audit checks your own list against the same Census data in your browser, and the ZIP spreadsheet comparison covers when a ZIP list is enough and when it is not.

What these numbers are, and are not

A ZCTA is not quite a ZIP code. ZIP Code Tabulation Areas are the Census Bureau's approximations of ZIP code areas, built by grouping census blocks by the ZIP codes of the addresses in them. USPS ZIP codes are delivery routes, not areas, and the two do not always match.
Some ZIP codes have no ZCTA at all. PO box ZIPs, ZIPs for a single building or a single large organisation, and military ZIPs usually have no area of their own, so they cannot be split across counties here and will not match any area in a map.
Land share is not population share. A ZCTA with 20% of its land in a second county might have almost none of its people there, or most of them. The shares here measure area, which is what the Census file publishes.
Tiny overlaps are included. A ZCTA counts as overlapping a county if the Census file lists any part of it there, including slivers along a road or river. That is why the share with at least 5% of land in a second county is shown alongside.

Source: U.S. Census Bureau, 2020 ZCTA to County relationship file, public domain. Counts use 2020 ZCTAs and 2020 county boundaries. ZIP codes added by USPS since then are not in it, and Connecticut's counties have since been replaced by planning regions in Census data.

Route by the boundary, not the ZIP

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