ZIP codes and county lines in Ohio

464 of the 1233 ZIP code areas in Ohio, or 37.6%, 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: 1,233
In more than one county: 464
At least 5% in a second county: 322
Cross a state line: 0

How Ohio compares

Ohio ranks 20 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 88 of its counties have at least one split ZIP code area along an edge.

Counties with the most split ZIP code areas

Stark County: 22 ZIP codes shared with another county
Wayne County: 20 ZIP codes shared with another county
Licking County: 19 ZIP codes shared with another county
Mahoning County: 19 ZIP codes shared with another county
Delaware County: 18 ZIP codes shared with another county

Every split ZIP code area in Ohio

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
43003	Morrow County 50.3% Delaware County 49.7%	49.7%	2
43006	Coshocton County 45.6% Holmes County 44.1% Knox County 10.3%	54.4%	3
43011	Knox County 51.7% Licking County 19.4% Morrow County 15.3% Delaware County 13.6%	48.3%	4
43013	Licking County 99.0% Delaware County 0.9%	0.9%	2
43014	Knox County 94.4% Coshocton County 5.1% Ashland County 0.5%	5.6%	3
43015	Delaware County 99.5% Union County 0.5%	0.5%	2
43016	Franklin County 91.0% Union County 8.5% Delaware County 0.6%	9.0%	3
43017	Franklin County 73.5% Delaware County 22.4% Union County 4.1%	26.5%	3
43019	Knox County 68.6% Morrow County 28.6% Richland County 2.7%	31.4%	3
43026	Franklin County 99.0% Madison County 1.0%	1.0%	2
43029	Madison County 78.7% Union County 21.4%	21.4%	2
43031	Licking County 94.7% Delaware County 5.3%	5.3%	2
43040	Union County 99.2% Delaware County 0.8%	0.8%	2
43044	Champaign County 69.0% Madison County 16.0% Clark County 15.0%	31.0%	3
43045	Union County 92.8% Champaign County 7.2%	7.2%	2
43046	Fairfield County 87.7% Licking County 12.3%	12.3%	2
43050	Knox County 99.4% Morrow County 0.6%	0.6%	2
43054	Franklin County 78.6% Licking County 19.9% Delaware County 1.5%	21.4%	3
43056	Licking County 97.7% Muskingum County 2.3%	2.3%	2
43060	Champaign County 69.3% Logan County 21.8% Union County 8.9%	30.7%	3
43061	Delaware County 83.6% Union County 16.4%	16.4%	2
43062	Licking County 98.3% Fairfield County 1.7%	1.7%	2
43064	Madison County 56.6% Union County 43.1% Franklin County 0.3%	43.4%	3
43065	Delaware County 95.5% Franklin County 4.5%	4.5%	2
43067	Union County 89.5% Logan County 10.5%	10.5%	2
43068	Franklin County 49.3% Licking County 41.8% Fairfield County 8.9%	50.8%	3
43074	Delaware County 97.9% Licking County 2.1%	2.1%	2
43076	Perry County 57.7% Licking County 31.5% Fairfield County 10.7%	42.3%	3
43078	Champaign County 99.2% Clark County 0.8%	0.8%	2
43080	Licking County 59.9% Knox County 40.1%	40.1%	2
43081	Franklin County 99.3% Delaware County 0.7%	0.7%	2
43084	Champaign County 97.9% Union County 2.1%	2.1%	2
43102	Fairfield County 96.1% Hocking County 3.4% Pickaway County 0.6%	3.9%	3
43103	Pickaway County 99.4% Fairfield County 0.6%	0.6%	2
43105	Fairfield County 99.5% Licking County 0.5%	0.5%	2
43107	Fairfield County 87.4% Hocking County 7.9% Perry County 4.7%	12.6%	3
43110	Fairfield County 59.5% Franklin County 38.6% Pickaway County 1.9%	40.5%	3
43113	Pickaway County 99.6% Fairfield County 0.4%	0.4%	2
43115	Ross County 83.3% Pickaway County 16.7%	16.7%	2
43119	Franklin County 88.6% Madison County 11.4%	11.4%	2
43125	Franklin County 86.8% Pickaway County 13.2%	13.2%	2
43130	Fairfield County 99.8% Hocking County 0.2%	0.2%	2
43135	Hocking County 79.2% Pickaway County 12.2% Ross County 7.9% Vinton County 0.7%	20.9%	4
43137	Pickaway County 51.9% Franklin County 48.1%	48.1%	2
43138	Hocking County 94.1% Perry County 5.4% Vinton County 0.5%	5.9%	3
43140	Madison County 96.5% Franklin County 2.2% Clark County 1.3%	3.5%	3
43143	Madison County 53.5% Pickaway County 29.2% Fayette County 17.3%	46.5%	3
43145	Pickaway County 51.1% Fayette County 48.9%	48.9%	2
43146	Pickaway County 80.9% Franklin County 17.9% Madison County 1.2%	19.1%	3
43147	Fairfield County 98.4% Licking County 0.9% Franklin County 0.6%	1.6%	3
43148	Fairfield County 89.8% Perry County 10.2%	10.2%	2
43150	Fairfield County 57.5% Perry County 42.5%	42.5%	2
43152	Hocking County 77.0% Vinton County 23.0%	23.0%	2
43153	Madison County 74.6% Clark County 13.9% Fayette County 9.0% Greene County 2.4%	25.4%	4
43154	Fairfield County 66.5% Pickaway County 33.5%	33.5%	2
43155	Fairfield County 61.3% Hocking County 38.7%	38.7%	2
43160	Fayette County 94.1% Ross County 5.9%	5.9%	2
43164	Pickaway County 91.4% Ross County 8.6%	8.6%	2
43235	Franklin County 99.8% Delaware County 0.1%	0.1%	2
43302	Marion County 95.1% Crawford County 4.7% Union County 0.2%	4.9%	3
43310	Hardin County 55.4% Logan County 44.6%	44.6%	2
43314	Marion County 80.0% Crawford County 11.9% Morrow County 8.1%	20.0%	3
43315	Morrow County 90.3% Marion County 9.7%	9.7%	2
43316	Wyandot County 79.3% Seneca County 17.0% Hancock County 3.7%	20.7%	3
43318	Logan County 67.8% Champaign County 32.2%	32.2%	2
43319	Logan County 99.2% Union County 0.8%	0.8%	2
43323	Wyandot County 96.3% Marion County 3.7%	3.7%	2
43326	Hardin County 99.3% Marion County 0.7%	0.7%	2
43331	Logan County 65.3% Auglaize County 28.8% Hardin County 5.9%	34.7%	3
43332	Marion County 86.7% Hardin County 9.4% Wyandot County 3.9%	13.3%	3
43334	Morrow County 97.5% Delaware County 2.5%	2.5%	2
43337	Marion County 79.3% Wyandot County 20.7%	20.7%	2
43340	Hardin County 80.1% Union County 19.9%	19.9%	2
43342	Marion County 88.7% Union County 6.7% Delaware County 4.6%	11.3%	3
43343	Logan County 76.8% Champaign County 23.1%	23.1%	2
43344	Union County 94.4% Delaware County 4.8% Marion County 0.9%	5.6%	3
43345	Logan County 53.0% Hardin County 46.5% Union County 0.4%	47.0%	3
43347	Logan County 89.8% Hardin County 10.3%	10.3%	2
43356	Marion County 72.6% Delaware County 17.7% Morrow County 9.8%	27.4%	3
43357	Logan County 56.3% Champaign County 43.8%	43.8%	2
43358	Union County 51.5% Logan County 48.5%	48.5%	2
43406	Wood County 83.5% Sandusky County 16.5%	16.5%	2
43410	Sandusky County 91.3% Seneca County 8.7%	8.7%	2
43412	Lucas County 60.4% Ottawa County 39.6%	39.6%	2
43416	Ottawa County 85.9% Sandusky County 14.1%	14.1%	2
43420	Sandusky County 99.8% Ottawa County 0.2%	0.2%	2
43430	Ottawa County 79.2% Wood County 13.4% Sandusky County 7.4%	20.8%	3
43431	Sandusky County 97.4% Wood County 2.6%	2.6%	2
43442	Sandusky County 96.0% Ottawa County 4.0%	4.0%	2
43445	Ottawa County 82.8% Lucas County 17.2%	17.2%	2
43447	Wood County 69.9% Ottawa County 30.1%	30.1%	2
43449	Ottawa County 97.5% Sandusky County 2.5%	2.5%	2
43457	Wood County 56.1% Sandusky County 37.6% Seneca County 6.3%	43.9%	3
43464	Sandusky County 94.2% Erie County 5.8%	5.8%	2
43469	Sandusky County 91.9% Ottawa County 8.1%	8.1%	2
43502	Fulton County 77.5% Henry County 20.3% Williams County 2.2%	22.5%	3
43504	Lucas County 97.1% Fulton County 2.9%	2.9%	2
43506	Williams County 82.1% Defiance County 17.9%	17.9%	2
43511	Wood County 93.5% Henry County 6.5%	6.5%	2
43512	Defiance County 93.1% Paulding County 5.9% Henry County 1.0%	6.9%	3
43516	Henry County 67.7% Wood County 27.3% Hancock County 3.7% Putnam County 1.3%	32.3%	4
43517	Williams County 59.4% Defiance County 40.6%	40.6%	2
43521	Fulton County 97.5% Williams County 2.5%	2.5%	2
43522	Wood County 55.8% Lucas County 43.6% Henry County 0.5%	44.2%	3
43526	Defiance County 93.1% Paulding County 6.9%	6.9%	2
43527	Henry County 91.4% Defiance County 8.6%	8.6%	2
43532	Henry County 94.4% Fulton County 3.5% Lucas County 2.2%	5.6%	3
43545	Henry County 99.0% Defiance County 1.0%	1.0%	2
43548	Henry County 86.4% Defiance County 12.3% Putnam County 1.3%	13.6%	3
43557	Williams County 92.2% Henry County 6.3% Fulton County 1.5%	7.8%	3
43558	Fulton County 51.1% Lucas County 48.9%	48.9%	2
43567	Fulton County 98.5% Henry County 1.5%	1.5%	2
43570	Williams County 93.1% Fulton County 6.9%	6.9%	2
43605	Lucas County 98.5% Wood County 1.5%	1.5%	2
43716	Monroe County 72.6% Belmont County 27.4%	27.4%	2
43720	Muskingum County 92.6% Morgan County 7.4%	7.4%	2
43724	Noble County 94.0% Morgan County 5.8% Guernsey County 0.2%	6.0%	3
43728	Morgan County 96.6% Athens County 3.4%	3.4%	2
43731	Perry County 59.1% Morgan County 40.9%	40.9%	2
43732	Guernsey County 44.6% Noble County 33.4% Muskingum County 22.0%	55.4%	3
43739	Perry County 63.7% Licking County 36.3%	36.3%	2
43740	Licking County 55.1% Muskingum County 44.9%	44.9%	2
43746	Muskingum County 92.1% Licking County 7.9%	7.9%	2
43747	Monroe County 50.0% Belmont County 50.0%	50.0%	2
43749	Guernsey County 86.7% Coshocton County 12.9% Tuscarawas County 0.4%	13.3%	3
43756	Morgan County 98.7% Muskingum County 1.4%	1.4%	2
43760	Perry County 59.7% Muskingum County 32.6% Licking County 7.6%	40.3%	3
43762	Muskingum County 74.1% Guernsey County 25.9%	25.9%	2
43766	Perry County 81.0% Hocking County 19.0%	19.0%	2
43772	Noble County 70.2% Guernsey County 29.8%	29.8%	2
43773	Guernsey County 60.5% Noble County 38.0% Monroe County 1.5%	39.5%	3
43777	Muskingum County 70.3% Perry County 29.7%	29.7%	2
43778	Guernsey County 96.0% Noble County 4.0%	4.0%	2
43780	Guernsey County 63.6% Noble County 36.4%	36.4%	2
43787	Morgan County 83.7% Washington County 16.3%	16.3%	2
43788	Noble County 71.1% Monroe County 28.9%	28.9%	2
43804	Holmes County 66.5% Tuscarawas County 18.7% Coshocton County 14.8%	33.5%	3
43812	Coshocton County 99.9% Muskingum County under 0.1%	under 0.1%	2
43821	Muskingum County 71.6% Coshocton County 28.4%	28.4%	2
43822	Muskingum County 38.9% Licking County 28.7% Coshocton County 21.3% Knox County 11.1%	61.1%	4
43824	Coshocton County 94.0% Tuscarawas County 6.0%	6.0%	2
43830	Muskingum County 71.0% Licking County 29.1%	29.1%	2
43832	Tuscarawas County 60.5% Coshocton County 30.6% Guernsey County 8.9%	39.5%	3
43837	Tuscarawas County 92.5% Guernsey County 7.5%	7.5%	2
43840	Tuscarawas County 99.7% Coshocton County 0.3%	0.3%	2
43843	Coshocton County 71.3% Knox County 28.7%	28.7%	2
43901	Jefferson County 65.9% Harrison County 25.7% Belmont County 8.4%	34.1%	3
43903	Carroll County 65.2% Jefferson County 34.8%	34.8%	2
43907	Harrison County 96.7% Jefferson County 3.3%	3.3%	2
43908	Jefferson County 92.8% Carroll County 7.2%	7.2%	2
43910	Jefferson County 93.8% Harrison County 6.2%	6.2%	2
43917	Jefferson County 91.3% Belmont County 8.8%	8.8%	2
43930	Jefferson County 81.8% Columbiana County 18.3%	18.3%	2
43932	Jefferson County 92.7% Columbiana County 7.3%	7.3%	2
43942	Belmont County 73.2% Monroe County 26.8%	26.8%	2
43943	Jefferson County 97.9% Belmont County 2.1%	2.1%	2
43945	Columbiana County 59.0% Carroll County 28.9% Jefferson County 12.1%	41.0%	3
43950	Belmont County 97.8% Harrison County 2.2%	2.2%	2
43971	Jefferson County 67.4% Belmont County 32.6%	32.6%	2
43973	Harrison County 51.8% Guernsey County 47.6% Tuscarawas County 0.6%	48.2%	3
43977	Belmont County 78.3% Harrison County 21.7%	21.7%	2
43983	Belmont County 74.2% Guernsey County 14.7% Harrison County 11.1%	25.8%	3
43986	Harrison County 97.0% Carroll County 3.0%	3.0%	2
43988	Harrison County 66.1% Carroll County 33.9%	33.9%	2
44022	Cuyahoga County 72.5% Geauga County 27.5%	27.5%	2
44024	Geauga County 97.7% Lake County 2.3%	2.3%	2
44041	Ashtabula County 98.0% Lake County 2.0%	2.0%	2
44057	Lake County 94.3% Geauga County 5.2% Ashtabula County 0.5%	5.7%	3
44060	Lake County 94.1% Geauga County 5.9%	5.9%	2
44062	Geauga County 69.6% Trumbull County 24.8% Ashtabula County 5.5%	30.4%	3
44064	Geauga County 97.3% Ashtabula County 2.7%	2.7%	2
44076	Ashtabula County 85.1% Trumbull County 14.9%	14.9%	2
44086	Geauga County 86.3% Lake County 11.9% Ashtabula County 1.8%	13.7%	3
44089	Erie County 62.3% Lorain County 37.8%	37.8%	2
44090	Lorain County 98.9% Medina County 1.1%	1.1%	2
44094	Lake County 99.0% Geauga County 1.0%	1.0%	2
44099	Ashtabula County 86.0% Geauga County 14.0%	14.0%	2
44141	Cuyahoga County 82.1% Summit County 17.9%	17.9%	2
44149	Cuyahoga County 98.1% Medina County 1.9%	1.9%	2
44201	Portage County 98.6% Stark County 1.4%	1.4%	2
44202	Portage County 88.3% Summit County 6.5% Geauga County 5.2%	11.7%	3
44203	Summit County 97.6% Medina County 1.6% Wayne County 0.9%	2.4%	3
44214	Wayne County 85.8% Medina County 14.2%	14.2%	2
44216	Summit County 95.2% Stark County 4.3% Wayne County 0.6%	4.8%	3
44217	Wayne County 87.8% Medina County 12.2%	12.2%	2
44224	Summit County 98.3% Portage County 1.7%	1.7%	2
44230	Wayne County 93.2% Medina County 6.0% Summit County 0.8%	6.8%	3
44231	Portage County 85.0% Geauga County 15.0%	15.0%	2
44234	Portage County 65.5% Geauga County 34.5%	34.5%	2
44235	Medina County 98.0% Ashland County 2.0%	2.0%	2
44236	Summit County 99.3% Portage County 0.7%	0.7%	2
44240	Portage County 99.7% Summit County 0.3%	0.3%	2
44253	Medina County 83.2% Lorain County 16.8%	16.8%	2
44256	Medina County 99.5% Lorain County 0.5%	0.5%	2
44260	Portage County 93.2% Summit County 5.5% Stark County 1.3%	6.8%	3
44270	Wayne County 83.3% Medina County 16.7%	16.7%	2
44273	Medina County 98.8% Wayne County 1.2%	1.2%	2
44275	Medina County 93.3% Lorain County 6.7%	6.7%	2
44278	Summit County 96.1% Portage County 3.9%	3.9%	2
44280	Medina County 98.4% Lorain County 1.6%	1.6%	2
44281	Medina County 98.0% Summit County 2.0%	2.0%	2
44287	Wayne County 65.1% Ashland County 26.7% Medina County 8.2%	34.9%	3
44288	Portage County 97.9% Trumbull County 2.1%	2.1%	2
44312	Summit County 99.3% Portage County 0.7%	0.7%	2
44321	Summit County 97.2% Medina County 2.8%	2.8%	2
44333	Summit County 98.4% Medina County 1.6%	1.6%	2
44408	Columbiana County 63.5% Mahoning County 36.5%	36.5%	2
44412	Portage County 75.2% Mahoning County 24.8%	24.8%	2
44425	Trumbull County 95.7% Mahoning County 4.3%	4.3%	2
44427	Carroll County 52.4% Columbiana County 47.6%	47.6%	2
44428	Trumbull County 97.1% Ashtabula County 2.9%	2.9%	2
44429	Mahoning County 95.8% Portage County 4.2%	4.2%	2
44437	Trumbull County 94.1% Mahoning County 5.9%	5.9%	2
44440	Trumbull County 90.5% Mahoning County 9.5%	9.5%	2
44443	Mahoning County 93.1% Columbiana County 6.9%	6.9%	2
44444	Trumbull County 72.1% Portage County 21.4% Mahoning County 6.5%	27.9%	3
44449	Mahoning County 76.0% Portage County 24.0%	24.0%	2
44454	Mahoning County 91.4% Columbiana County 8.6%	8.6%	2
44460	Columbiana County 55.0% Mahoning County 45.0%	45.0%	2
44481	Trumbull County 96.9% Mahoning County 3.1%	3.1%	2
44490	Columbiana County 54.7% Mahoning County 45.3%	45.3%	2
44491	Trumbull County 83.8% Geauga County 14.8% Portage County 1.4%	16.2%	3
44504	Mahoning County 98.6% Trumbull County 1.4%	1.4%	2
44505	Mahoning County 63.3% Trumbull County 36.7%	36.7%	2
44509	Mahoning County 94.0% Trumbull County 6.0%	6.0%	2
44601	Stark County 72.9% Mahoning County 14.3% Columbiana County 12.8%	27.1%	3
44608	Stark County 72.4% Tuscarawas County 27.6%	27.6%	2
44609	Mahoning County 57.0% Columbiana County 43.0%	43.0%	2
44611	Holmes County 95.0% Wayne County 5.0%	5.0%	2
44612	Tuscarawas County 83.7% Stark County 16.3%	16.3%	2
44614	Stark County 91.4% Summit County 5.1% Wayne County 3.5%	8.6%	3
44618	Wayne County 91.9% Stark County 8.1%	8.1%	2
44619	Mahoning County 97.7% Columbiana County 2.3%	2.3%	2
44621	Tuscarawas County 65.6% Harrison County 19.1% Carroll County 15.4%	34.4%	3
44624	Holmes County 44.3% Tuscarawas County 43.3% Wayne County 10.8% Stark County 1.6%	55.7%	4
44625	Columbiana County 77.8% Carroll County 22.2%	22.2%	2
44626	Stark County 94.6% Tuscarawas County 5.4%	5.4%	2
44627	Holmes County 51.1% Wayne County 48.9%	48.9%	2
44628	Holmes County 66.9% Knox County 33.1%	33.1%	2
44632	Stark County 86.7% Portage County 13.3%	13.3%	2
44634	Columbiana County 85.4% Stark County 14.6%	14.6%	2
44637	Holmes County 78.4% Coshocton County 21.6%	21.6%	2
44638	Holmes County 62.3% Ashland County 27.6% Wayne County 10.2%	37.7%	3
44643	Carroll County 49.9% Stark County 36.5% Tuscarawas County 13.6%	50.1%	3
44645	Wayne County 99.4% Stark County 0.3% Summit County 0.3%	0.6%	3
44654	Holmes County 93.8% Coshocton County 6.2%	6.2%	2
44656	Tuscarawas County 83.3% Carroll County 16.7%	16.7%	2
44657	Carroll County 36.5% Stark County 34.8% Columbiana County 28.8%	63.5%	3
44662	Stark County 90.1% Wayne County 9.9%	9.9%	2
44666	Stark County 71.5% Wayne County 28.5%	28.5%	2
44675	Carroll County 70.7% Tuscarawas County 29.3%	29.3%	2
44676	Wayne County 73.1% Holmes County 26.9%	26.9%	2
44681	Tuscarawas County 58.9% Holmes County 41.1%	41.1%	2
44683	Tuscarawas County 75.6% Harrison County 24.4%	24.4%	2
44685	Summit County 51.6% Stark County 48.4%	48.4%	2
44688	Stark County 70.3% Carroll County 29.8%	29.8%	2
44689	Holmes County 85.7% Stark County 14.3%	14.3%	2
44691	Wayne County 99.5% Ashland County 0.5%	0.5%	2
44695	Carroll County 58.0% Harrison County 42.0%	42.0%	2
44699	Harrison County 71.1% Tuscarawas County 28.9%	28.9%	2
44720	Stark County 72.4% Summit County 27.6%	27.6%	2
44730	Stark County 96.9% Carroll County 3.1%	3.1%	2
44802	Seneca County 50.9% Hancock County 49.1%	49.1%	2
44805	Ashland County 94.8% Richland County 5.2%	5.2%	2
44807	Seneca County 80.1% Huron County 19.9%	19.9%	2
44811	Huron County 33.2% Seneca County 32.9% Sandusky County 19.4% Erie County 14.5%	66.8%	4
44813	Richland County 86.0% Morrow County 9.1% Knox County 4.9%	14.0%	3
44817	Wood County 85.3% Hancock County 14.7%	14.7%	2
44818	Seneca County 50.5% Crawford County 49.5%	49.5%	2
44820	Crawford County 99.5% Wyandot County 0.5%	0.5%	2
44822	Richland County 58.9% Knox County 41.1%	41.1%	2
44824	Erie County 94.2% Sandusky County 5.8%	5.8%	2
44826	Huron County 90.3% Erie County 9.7%	9.7%	2
44827	Crawford County 78.2% Richland County 21.9%	21.9%	2
44830	Seneca County 59.0% Hancock County 21.9% Wood County 19.0%	41.0%	3
44833	Morrow County 43.7% Crawford County 42.5% Richland County 8.3% Marion County 5.5%	56.3%	4
44836	Seneca County 82.1% Sandusky County 17.9%	17.9%	2
44837	Huron County 64.5% Ashland County 18.6% Richland County 16.9%	35.5%	3
44840	Ashland County 99.8% Wayne County 0.2%	0.2%	2
44841	Seneca County 55.4% Sandusky County 44.6%	44.6%	2
44842	Ashland County 71.1% Holmes County 26.6% Knox County 2.3%	28.9%	3
44843	Richland County 96.8% Ashland County 3.2%	3.2%	2
44844	Seneca County 52.4% Wyandot County 47.6%	47.6%	2
44846	Erie County 97.2% Huron County 2.8%	2.8%	2
44847	Huron County 76.3% Erie County 23.7%	23.7%	2
44849	Wyandot County 73.2% Crawford County 23.5% Marion County 3.3%	26.8%	3
44851	Huron County 72.7% Lorain County 18.8% Ashland County 8.5%	27.3%	3
44854	Crawford County 92.8% Seneca County 7.2%	7.2%	2
44857	Huron County 97.4% Erie County 2.6%	2.6%	2
44859	Ashland County 96.5% Lorain County 3.5%	3.5%	2
44864	Ashland County 74.8% Richland County 25.2%	25.2%	2
44865	Huron County 46.1% Richland County 44.3% Crawford County 9.5%	53.9%	3
44875	Richland County 93.2% Crawford County 6.8%	6.8%	2
44878	Richland County 89.8% Huron County 5.8% Ashland County 4.3%	10.2%	3
44880	Ashland County 86.2% Lorain County 12.2% Medina County 1.7%	13.8%	3
44882	Wyandot County 57.8% Crawford County 32.9% Seneca County 9.3%	42.2%	3
44889	Huron County 64.0% Erie County 23.0% Lorain County 13.1%	36.0%	3
44903	Richland County 95.4% Morrow County 3.6% Ashland County 1.0%	4.6%	3
44904	Richland County 61.7% Morrow County 38.3%	38.3%	2
45003	Preble County 81.2% Butler County 18.8%	18.8%	2
45005	Warren County 99.4% Montgomery County 0.6%	0.6%	2
45013	Butler County 96.8% Hamilton County 3.3%	3.3%	2
45042	Butler County 91.9% Preble County 6.5% Montgomery County 0.9% Warren County 0.7%	8.1%	4
45044	Butler County 92.0% Warren County 8.0%	8.0%	2
45050	Butler County 82.9% Warren County 17.1%	17.1%	2
45064	Butler County 51.6% Preble County 48.4%	48.4%	2
45066	Warren County 99.0% Montgomery County 1.0%	1.0%	2
45068	Warren County 88.1% Greene County 9.9% Clinton County 2.0%	11.9%	3
45069	Butler County 99.3% Hamilton County 0.7%	0.7%	2
45101	Brown County 98.6% Adams County 1.4%	1.4%	2
45106	Clermont County 78.9% Brown County 21.1%	21.1%	2
45107	Clinton County 51.9% Warren County 18.8% Brown County 18.2% Clermont County 11.1%	48.1%	4
45113	Clinton County 57.6% Warren County 42.4%	42.4%	2
45118	Brown County 87.0% Highland County 9.1% Clermont County 3.9%	13.0%	3
45120	Clermont County 75.0% Brown County 25.0%	25.0%	2
45121	Brown County 95.7% Clermont County 4.3%	4.3%	2
45122	Clermont County 89.8% Warren County 10.2%	10.2%	2
45123	Highland County 42.7% Ross County 33.2% Fayette County 24.1%	57.3%	3
45130	Brown County 82.6% Clermont County 17.4%	17.4%	2
45133	Highland County 96.6% Pike County 3.3% Brown County 0.1%	3.4%	3
45135	Highland County 68.8% Fayette County 21.3% Clinton County 9.9%	31.2%	3
45140	Clermont County 53.4% Warren County 31.1% Hamilton County 15.5%	46.6%	3
45142	Highland County 76.3% Clinton County 16.8% Brown County 6.9%	23.7%	3
45144	Adams County 90.6% Brown County 9.4%	9.4%	2
45148	Clinton County 98.4% Brown County 1.6%	1.6%	2
45150	Clermont County 99.2% Hamilton County 0.8%	0.8%	2
45154	Brown County 88.7% Highland County 11.3%	11.3%	2
45159	Clinton County 61.7% Highland County 38.3%	38.3%	2
45162	Warren County 64.6% Clermont County 35.4%	35.4%	2
45169	Clinton County 73.9% Fayette County 19.9% Greene County 6.2%	26.1%	3
45171	Brown County 58.0% Highland County 42.0%	42.0%	2
45176	Clermont County 64.3% Brown County 35.7%	35.7%	2
45241	Hamilton County 79.9% Butler County 19.5% Warren County 0.6%	20.1%	3
45244	Hamilton County 68.4% Clermont County 31.6%	31.6%	2
45246	Hamilton County 76.7% Butler County 23.3%	23.3%	2
45249	Hamilton County 92.3% Warren County 7.7%	7.7%	2
45255	Hamilton County 68.1% Clermont County 31.9%	31.9%	2
45304	Darke County 97.9% Preble County 1.5% Miami County 0.6%	2.1%	3
45306	Shelby County 98.3% Auglaize County 1.7%	1.7%	2
45308	Darke County 72.6% Miami County 27.4%	27.4%	2
45309	Montgomery County 94.7% Darke County 2.4% Miami County 2.3% Preble County 0.6%	5.3%	4
45310	Mercer County 72.2% Darke County 27.8%	27.8%	2
45312	Miami County 98.0% Champaign County 2.0%	2.0%	2
45314	Greene County 98.1% Clark County 1.9%	1.9%	2
45316	Clark County 54.1% Greene County 45.9%	45.9%	2
45317	Champaign County 48.2% Miami County 38.1% Shelby County 13.6%	51.8%	3
45318	Miami County 99.3% Darke County 0.7%	0.7%	2
45322	Montgomery County 77.5% Miami County 22.6%	22.6%	2
45324	Greene County 77.6% Clark County 22.4%	22.4%	2
45327	Montgomery County 94.2% Preble County 4.2% Butler County 1.6% Warren County under 0.1%	5.8%	4
45334	Shelby County 93.7% Auglaize County 4.2% Logan County 2.1%	6.3%	3
45335	Greene County 93.0% Fayette County 4.2% Clinton County 2.9%	7.0%	3
45337	Miami County 62.9% Darke County 37.1%	37.1%	2
45338	Preble County 99.7% Darke County 0.3%	0.3%	2
45342	Montgomery County 98.4% Warren County 1.6%	1.6%	2
45344	Clark County 78.4% Miami County 20.3% Champaign County 1.1% Montgomery County 0.2%	21.6%	4
45347	Preble County 74.3% Darke County 25.7%	25.7%	2
45356	Miami County 84.5% Shelby County 15.5%	15.5%	2
45365	Shelby County 99.4% Champaign County 0.6%	0.6%	2
45368	Clark County 93.1% Greene County 6.9%	6.9%	2
45369	Clark County 96.8% Madison County 3.1%	3.1%	2
45371	Miami County 95.7% Montgomery County 4.3%	4.3%	2
45378	Preble County 80.2% Montgomery County 19.8%	19.8%	2
45380	Darke County 98.9% Shelby County 1.1%	1.1%	2
45381	Preble County 90.7% Montgomery County 9.3%	9.3%	2
45382	Preble County 76.0% Darke County 24.1%	24.1%	2
45387	Greene County 91.5% Clark County 8.5%	8.5%	2
45388	Darke County 95.8% Shelby County 2.3% Mercer County 1.9%	4.2%	3
45424	Montgomery County 84.7% Greene County 11.2% Miami County 4.2%	15.3%	3
45431	Greene County 61.7% Montgomery County 38.3%	38.3%	2
45432	Greene County 66.4% Montgomery County 33.6%	33.6%	2
45440	Greene County 63.8% Montgomery County 36.2%	36.2%	2
45458	Montgomery County 82.3% Warren County 15.6% Greene County 2.1%	17.6%	3
45459	Montgomery County 96.7% Greene County 3.3%	3.3%	2
45502	Clark County 98.7% Champaign County 1.4%	1.4%	2
45601	Ross County 93.9% Pike County 3.4% Jackson County 2.7%	6.1%	3
45612	Ross County 61.8% Pike County 27.0% Highland County 11.3%	38.2%	3
45613	Pike County 82.8% Jackson County 12.8% Scioto County 4.4%	17.2%	3
45616	Adams County 74.4% Scioto County 25.6%	25.6%	2
45620	Gallia County 97.8% Meigs County 2.2%	2.2%	2
45622	Vinton County 82.4% Hocking County 17.6%	17.6%	2
45623	Gallia County 91.5% Lawrence County 8.5%	8.5%	2
45629	Scioto County 99.2% Lawrence County 0.8%	0.8%	2
45634	Vinton County 98.6% Jackson County 1.4%	1.4%	2
45638	Lawrence County 88.6% Scioto County 11.4%	11.4%	2
45644	Ross County 67.6% Pickaway County 32.4%	32.4%	2
45647	Vinton County 64.3% Ross County 35.7%	35.7%	2
45648	Scioto County 73.3% Pike County 26.7%	26.7%	2
45653	Scioto County 98.7% Jackson County 1.3%	1.3%	2
45654	Vinton County 72.4% Hocking County 27.6%	27.6%	2
45656	Jackson County 73.3% Gallia County 15.0% Lawrence County 10.8% Scioto County 0.8%	26.7%	4
45657	Scioto County 87.0% Adams County 11.7% Pike County 1.3%	12.9%	3
45658	Gallia County 97.9% Lawrence County 2.1%	2.1%	2
45659	Lawrence County 99.8% Scioto County 0.2%	0.2%	2
45660	Adams County 74.8% Pike County 19.4% Highland County 3.2% Scioto County 2.7%	25.2%	4
45661	Pike County 99.6% Scioto County 0.4%	0.4%	2
45671	Scioto County 84.8% Pike County 14.7% Adams County 0.5%	15.2%	3
45672	Vinton County 57.7% Jackson County 41.7% Ross County 0.6%	42.3%	3
45678	Lawrence County 81.4% Gallia County 18.6%	18.6%	2
45679	Adams County 91.8% Highland County 8.2%	8.2%	2
45682	Scioto County 76.6% Lawrence County 21.3% Jackson County 2.1%	23.4%	3
45684	Adams County 58.2% Scioto County 41.8%	41.8%	2
45685	Jackson County 65.8% Gallia County 34.2%	34.2%	2
45686	Gallia County 61.4% Vinton County 32.3% Meigs County 6.3%	38.6%	3
45688	Lawrence County 97.6% Gallia County 2.4%	2.4%	2
45690	Pike County 88.0% Ross County 12.0%	12.0%	2
45692	Jackson County 99.5% Vinton County 0.5%	0.5%	2
45697	Adams County 51.3% Brown County 34.3% Highland County 14.4%	48.7%	3
45710	Meigs County 46.0% Athens County 35.7% Vinton County 18.3%	54.0%	3
45711	Athens County 81.7% Morgan County 11.4% Washington County 7.0%	18.3%	3
45715	Morgan County 59.4% Washington County 26.3% Noble County 14.3%	40.6%	3
45723	Athens County 78.2% Meigs County 16.8% Washington County 5.0%	21.8%	3
45727	Noble County 96.7% Washington County 3.3%	3.3%	2
45732	Athens County 47.9% Morgan County 36.5% Perry County 15.5%	52.1%	3
45735	Athens County 99.8% Meigs County 0.2%	0.2%	2
45742	Washington County 96.9% Athens County 3.1%	3.1%	2
45744	Washington County 95.4% Noble County 4.6%	4.6%	2
45745	Noble County 51.5% Washington County 31.6% Monroe County 16.9%	48.5%	3
45746	Washington County 75.7% Noble County 24.3%	24.3%	2
45760	Meigs County 93.2% Gallia County 6.8%	6.8%	2
45764	Hocking County 50.7% Athens County 49.3%	49.3%	2
45766	Athens County 79.7% Vinton County 20.3%	20.3%	2
45767	Washington County 68.0% Monroe County 32.0%	32.0%	2
45776	Meigs County 56.2% Athens County 43.8%	43.8%	2
45786	Washington County 95.8% Morgan County 4.2%	4.2%	2
45789	Washington County 89.9% Monroe County 10.1%	10.1%	2
45806	Allen County 78.0% Auglaize County 22.0%	22.0%	2
45810	Hardin County 79.8% Hancock County 12.2% Allen County 8.1%	20.3%	3
45812	Hardin County 98.0% Allen County 2.0%	2.0%	2
45813	Paulding County 98.4% Defiance County 1.6%	1.6%	2
45817	Allen County 49.7% Hancock County 47.2% Putnam County 3.2%	50.3%	3
45821	Paulding County 96.5% Defiance County 3.5%	3.5%	2
45827	Putnam County 85.6% Paulding County 14.4%	14.4%	2
45830	Putnam County 67.2% Allen County 32.8%	32.8%	2
45831	Putnam County 97.1% Defiance County 2.2% Paulding County 0.7%	2.9%	3
45832	Van Wert County 96.7% Paulding County 3.3%	3.3%	2
45833	Allen County 45.9% Van Wert County 44.6% Putnam County 9.5%	54.1%	3
45836	Hardin County 96.2% Hancock County 3.9%	3.9%	2
45843	Hardin County 37.8% Wyandot County 37.4% Hancock County 24.9%	62.2%	3
45844	Putnam County 86.9% Van Wert County 8.4% Allen County 4.7%	13.1%	3
45845	Shelby County 96.6% Auglaize County 3.4% Mercer County under 0.1%	3.4%	3
45846	Mercer County 85.9% Darke County 14.1%	14.1%	2
45849	Paulding County 74.4% Van Wert County 23.0% Putnam County 2.6%	25.6%	3
45850	Allen County 80.7% Hardin County 14.9% Auglaize County 4.3%	19.3%	3
45856	Putnam County 95.7% Henry County 3.2% Hancock County 1.1%	4.3%	3
45862	Mercer County 92.4% Auglaize County 7.6%	7.6%	2
45865	Auglaize County 60.3% Shelby County 37.5% Mercer County 2.2%	39.7%	3
45867	Hancock County 97.0% Wyandot County 3.0%	3.0%	2
45868	Hancock County 95.8% Putnam County 4.2%	4.2%	2
45869	Auglaize County 76.5% Shelby County 13.4% Mercer County 10.1%	23.4%	3
45871	Auglaize County 72.5% Shelby County 27.5%	27.5%	2
45872	Wood County 88.6% Hancock County 11.4%	11.4%	2
45873	Paulding County 98.7% Putnam County 1.4%	1.4%	2
45877	Putnam County 90.1% Allen County 8.9% Hancock County 1.0%	9.9%	3
45882	Mercer County 94.0% Van Wert County 6.0%	6.0%	2
45883	Mercer County 97.4% Darke County 2.6%	2.6%	2
45885	Auglaize County 100.0% Mercer County under 0.1%	under 0.1%	2
45886	Paulding County 53.2% Van Wert County 46.8%	46.8%	2
45887	Allen County 55.1% Auglaize County 24.5% Van Wert County 17.8% Mercer County 2.5%	44.9%	4
45889	Hancock County 99.7% Wood County 0.3%	0.3%	2
45894	Van Wert County 97.0% Mercer County 3.0%	3.0%	2
45895	Auglaize County 98.3% Logan County 1.6% Allen County 0.1%	1.7%	3
45896	Auglaize County 81.4% Hardin County 12.5% Allen County 6.1%	18.6%	3
45898	Van Wert County 66.3% Mercer County 33.7%	33.7%	2

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

MapLogics decides who owns an address from a boundary you draw or import, so a ZIP that straddles two counties is answered by where the address actually is. There is a free trial if you want to see it on your own addresses.

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