ZIP codes and county lines in North Carolina

329 of the 853 ZIP code areas in North Carolina, or 38.6%, 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: 853
In more than one county: 329
At least 5% in a second county: 232
Cross a state line: 2

How North Carolina compares

North Carolina ranks 18 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 99 of its counties have at least one split ZIP code area along an edge. 2 of its ZIP code areas also reach into Virginia, so a ZIP list that is meant to stop at the state line does not.

Counties with the most split ZIP code areas

Wake County: 22 ZIP codes shared with another county
Randolph County: 18 ZIP codes shared with another county
Guilford County: 17 ZIP codes shared with another county
Johnston County: 16 ZIP codes shared with another county
Chatham County: 15 ZIP codes shared with another county

Every split ZIP code area in North Carolina

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
27009	Forsyth County 90.2% Stokes County 9.8%	9.8%	2
27012	Forsyth County 61.8% Davidson County 38.3%	38.3%	2
27013	Rowan County 80.7% Iredell County 19.3%	19.3%	2
27019	Stokes County 68.0% Forsyth County 32.0%	32.0%	2
27020	Yadkin County 78.4% Iredell County 13.8% Wilkes County 7.8%	21.6%	3
27021	Stokes County 99.3% Forsyth County 0.7%	0.7%	2
27025	Rockingham County 71.9% Stokes County 28.1%	28.1%	2
27028	Davie County 99.4% Iredell County 0.6%	0.6%	2
27030	Surry County 95.7% Stokes County 4.3%	4.3%	2
27041	Surry County 81.4% Stokes County 18.6%	18.6%	2
27043	Stokes County 52.4% Surry County 47.0% Forsyth County 0.6%	47.6%	3
27045	Forsyth County 91.5% Stokes County 8.5%	8.5%	2
27048	Rockingham County 98.6% Henry County, VA 1.4%	1.4%	2
27050	Forsyth County 87.0% Stokes County 13.0%	13.0%	2
27052	Stokes County 88.6% Forsyth County 11.4%	11.4%	2
27053	Stokes County 96.5% Surry County 3.5%	3.5%	2
27055	Yadkin County 97.0% Davie County 1.7% Iredell County 1.3%	3.0%	3
27107	Davidson County 52.7% Forsyth County 47.3%	47.3%	2
27127	Forsyth County 81.4% Davidson County 18.6%	18.6%	2
27208	Chatham County 52.8% Randolph County 38.8% Moore County 8.4%	47.2%	3
27209	Montgomery County 68.6% Moore County 31.4%	31.4%	2
27214	Guilford County 88.7% Rockingham County 11.3%	11.3%	2
27215	Alamance County 88.4% Guilford County 11.6%	11.6%	2
27217	Alamance County 82.3% Caswell County 17.7%	17.7%	2
27229	Montgomery County 97.3% Richmond County 2.7%	2.7%	2
27231	Orange County 97.2% Caswell County 1.7% Person County 1.1%	2.8%	3
27233	Randolph County 66.7% Guilford County 33.3%	33.3%	2
27239	Davidson County 60.0% Randolph County 40.0%	40.0%	2
27244	Alamance County 46.6% Caswell County 42.0% Guilford County 11.4%	53.4%	3
27249	Guilford County 79.7% Alamance County 8.9% Rockingham County 8.3% Caswell County 3.1%	20.3%	4
27260	Guilford County 96.5% Randolph County 3.5%	3.5%	2
27262	Guilford County 66.5% Davidson County 32.9% Randolph County 0.6%	33.5%	3
27263	Randolph County 61.6% Guilford County 38.4%	38.4%	2
27265	Guilford County 58.4% Davidson County 38.6% Forsyth County 3.0%	41.6%	3
27278	Orange County 96.0% Durham County 4.0%	4.0%	2
27281	Moore County 58.7% Montgomery County 29.0% Richmond County 12.3%	41.3%	3
27283	Guilford County 98.5% Randolph County 1.5%	1.5%	2
27284	Forsyth County 82.9% Guilford County 14.3% Davidson County 2.8%	17.1%	3
27291	Caswell County 68.8% Person County 31.2%	31.2%	2
27292	Davidson County 99.3% Randolph County 0.7%	0.7%	2
27298	Randolph County 44.5% Alamance County 30.7% Guilford County 23.8% Chatham County 1.0%	55.5%	4
27302	Alamance County 40.4% Orange County 36.3% Caswell County 23.4%	59.6%	3
27305	Caswell County 97.4% Person County 2.6%	2.6%	2
27306	Montgomery County 77.3% Richmond County 22.7%	22.7%	2
27311	Caswell County 82.0% Rockingham County 18.1%	18.1%	2
27312	Chatham County 99.4% Alamance County 0.6%	0.6%	2
27313	Guilford County 69.7% Randolph County 30.3%	30.3%	2
27317	Randolph County 94.8% Guilford County 5.2%	5.2%	2
27320	Rockingham County 87.6% Caswell County 12.2% Guilford County 0.3%	12.4%	3
27325	Moore County 98.8% Randolph County 1.2%	1.2%	2
27326	Rockingham County 68.7% Caswell County 31.3%	31.3%	2
27330	Lee County 83.4% Chatham County 8.4% Moore County 6.1% Harnett County 2.1%	16.6%	4
27332	Lee County 64.1% Harnett County 35.9%	35.9%	2
27341	Randolph County 63.5% Moore County 28.7% Montgomery County 7.8%	36.5%	3
27343	Person County 75.8% Caswell County 24.2%	24.2%	2
27344	Chatham County 94.9% Randolph County 5.1%	5.1%	2
27349	Alamance County 91.3% Chatham County 8.7%	8.7%	2
27355	Randolph County 68.5% Chatham County 31.5%	31.5%	2
27356	Montgomery County 78.8% Moore County 21.2%	21.2%	2
27357	Rockingham County 62.1% Guilford County 37.7% Stokes County 0.1%	37.9%	3
27358	Guilford County 70.8% Rockingham County 29.3%	29.3%	2
27360	Davidson County 87.8% Randolph County 12.2%	12.2%	2
27371	Montgomery County 92.3% Randolph County 7.7%	7.7%	2
27501	Harnett County 61.8% Johnston County 37.5% Wake County 0.8%	38.3%	3
27502	Wake County 79.7% Chatham County 20.3%	20.3%	2
27504	Johnston County 97.2% Harnett County 2.8%	2.8%	2
27505	Harnett County 96.3% Lee County 3.7%	3.7%	2
27507	Granville County 78.1% Vance County 21.9%	21.9%	2
27516	Orange County 83.5% Chatham County 16.5%	16.5%	2
27517	Chatham County 57.9% Orange County 23.3% Durham County 18.8%	42.1%	3
27519	Wake County 91.9% Chatham County 8.1%	8.1%	2
27520	Johnston County 95.9% Wake County 4.1%	4.1%	2
27522	Granville County 88.0% Wake County 12.0%	12.0%	2
27523	Chatham County 67.3% Wake County 32.7%	32.7%	2
27524	Johnston County 92.0% Wayne County 8.0%	8.0%	2
27525	Franklin County 72.1% Granville County 27.9%	27.9%	2
27526	Harnett County 59.7% Wake County 40.3%	40.3%	2
27529	Wake County 66.1% Johnston County 33.9%	33.9%	2
27534	Wayne County 99.2% Greene County 0.8%	0.8%	2
27537	Vance County 87.7% Franklin County 8.1% Warren County 4.2%	12.3%	3
27540	Wake County 72.4% Harnett County 20.1% Chatham County 7.5%	27.6%	3
27541	Person County 68.1% Orange County 31.5% Caswell County 0.4%	31.9%	3
27542	Johnston County 64.3% Wilson County 27.4% Wayne County 8.3%	35.7%	3
27544	Vance County 50.9% Franklin County 29.7% Granville County 19.3%	49.1%	3
27553	Warren County 65.0% Vance County 35.0%	35.0%	2
27557	Nash County 65.0% Johnston County 32.0% Wilson County 2.8% Franklin County 0.2%	35.0%	4
27560	Wake County 86.9% Durham County 13.1%	13.1%	2
27562	Chatham County 60.6% Wake County 39.4%	39.4%	2
27563	Warren County 97.0% Vance County 3.0%	3.0%	2
27565	Granville County 94.8% Vance County 4.0% Person County 1.2%	5.3%	3
27569	Johnston County 79.0% Wayne County 20.9%	20.9%	2
27572	Person County 35.8% Durham County 24.4% Orange County 23.6% Granville County 16.2%	64.2%	4
27574	Person County 97.3% Granville County 2.7%	2.7%	2
27583	Person County 95.8% Orange County 2.9% Durham County 1.3%	4.2%	3
27587	Wake County 87.7% Granville County 9.6% Franklin County 2.7%	12.3%	3
27589	Warren County 96.4% Franklin County 3.6%	3.6%	2
27591	Wake County 69.9% Johnston County 30.1%	30.1%	2
27592	Wake County 60.2% Johnston County 39.3% Harnett County 0.5%	39.8%	3
27596	Franklin County 90.8% Wake County 5.9% Granville County 3.3%	9.2%	3
27597	Wake County 42.2% Franklin County 28.4% Johnston County 22.9% Nash County 6.5%	57.8%	4
27603	Wake County 95.4% Johnston County 4.6%	4.6%	2
27610	Wake County 99.8% Johnston County 0.2%	0.2%	2
27613	Wake County 83.5% Durham County 16.5%	16.5%	2
27617	Wake County 97.5% Durham County 2.5%	2.5%	2
27703	Durham County 99.3% Wake County 0.7%	0.7%	2
27705	Durham County 53.1% Orange County 46.9%	46.9%	2
27707	Durham County 91.5% Orange County 8.5%	8.5%	2
27712	Durham County 98.3% Orange County 1.7%	1.7%	2
27713	Durham County 73.0% Chatham County 26.4% Wake County 0.6%	27.0%	3
27803	Nash County 84.7% Wilson County 9.5% Edgecombe County 5.8%	15.3%	3
27805	Bertie County 60.8% Hertford County 39.2%	39.2%	2
27807	Nash County 93.0% Wilson County 7.0%	7.0%	2
27809	Edgecombe County 62.9% Nash County 37.1%	37.1%	2
27810	Hyde County 60.4% Beaufort County 39.6%	39.6%	2
27812	Pitt County 65.2% Edgecombe County 26.5% Martin County 8.3%	34.8%	3
27816	Franklin County 51.7% Nash County 48.3%	48.3%	2
27822	Wilson County 74.8% Nash County 16.4% Edgecombe County 8.8%	25.2%	3
27826	Hyde County 73.9% Tyrrell County 26.1%	26.1%	2
27828	Pitt County 68.6% Greene County 31.4%	31.4%	2
27829	Pitt County 63.4% Edgecombe County 20.6% Wilson County 16.0%	36.6%	3
27830	Wayne County 89.4% Wilson County 10.6%	10.6%	2
27834	Pitt County 96.2% Beaufort County 2.7% Edgecombe County 1.1%	3.8%	3
27837	Pitt County 96.9% Beaufort County 3.1%	3.1%	2
27842	Northampton County 88.4% Warren County 11.6%	11.6%	2
27843	Edgecombe County 34.5% Martin County 33.1% Halifax County 32.4%	65.5%	3
27844	Halifax County 71.2% Warren County 20.6% Nash County 4.5% Franklin County 3.6%	28.8%	4
27850	Halifax County 64.5% Warren County 35.5%	35.5%	2
27851	Wilson County 99.1% Wayne County 0.9%	0.9%	2
27852	Edgecombe County 81.5% Pitt County 9.8% Wilson County 8.7%	18.4%	3
27855	Hertford County 83.4% Northampton County 16.6%	16.6%	2
27860	Beaufort County 55.1% Washington County 30.3% Hyde County 14.7%	44.9%	3
27863	Wayne County 96.0% Greene County 2.8% Johnston County 1.2%	4.0%	3
27869	Northampton County 99.7% Bertie County 0.3%	0.3%	2
27871	Martin County 72.5% Pitt County 26.9% Beaufort County 0.6%	27.5%	3
27878	Nash County 59.5% Wilson County 27.5% Edgecombe County 12.9%	40.5%	3
27880	Wilson County 95.8% Nash County 4.2%	4.2%	2
27882	Nash County 78.1% Franklin County 21.9%	21.9%	2
27883	Wilson County 47.8% Greene County 36.6% Wayne County 15.6%	52.2%	3
27886	Edgecombe County 97.0% Pitt County 3.0%	3.0%	2
27888	Greene County 73.0% Wilson County 17.0% Pitt County 10.1%	27.1%	3
27889	Beaufort County 90.4% Pitt County 7.5% Martin County 2.0%	9.6%	3
27891	Nash County 47.9% Edgecombe County 45.3% Halifax County 6.8%	52.1%	3
27892	Martin County 99.6% Beaufort County 0.4%	0.4%	2
27896	Wilson County 67.5% Nash County 32.5%	32.5%	2
27897	Northampton County 79.6% Hertford County 20.4%	20.4%	2
27909	Pasquotank County 100.0% Camden County under 0.1%	under 0.1%	2
27910	Hertford County 69.7% Bertie County 30.3%	30.3%	2
27919	Perquimans County 90.4% Chowan County 9.6%	9.6%	2
27924	Bertie County 91.6% Hertford County 8.4%	8.4%	2
27928	Washington County 68.7% Tyrrell County 31.3%	31.3%	2
27932	Chowan County 90.8% Perquimans County 9.2%	9.2%	2
27946	Gates County 87.1% Chowan County 12.8% Perquimans County under 0.1%	12.9%	3
27962	Washington County 93.1% Beaufort County 6.9%	6.9%	2
27973	Currituck County 62.6% Camden County 37.4%	37.4%	2
27980	Chowan County 87.6% Perquimans County 12.4%	12.4%	2
28006	Gaston County 51.5% Lincoln County 48.5%	48.5%	2
28020	Cleveland County 87.1% Rutherford County 12.9%	12.9%	2
28021	Gaston County 43.6% Lincoln County 32.7% Cleveland County 23.6%	56.4%	3
28027	Cabarrus County 100.0% Mecklenburg County under 0.1%	under 0.1%	2
28033	Lincoln County 63.3% Gaston County 36.7%	36.7%	2
28036	Mecklenburg County 58.0% Cabarrus County 33.6% Iredell County 8.1% Rowan County 0.3%	42.0%	4
28037	Lincoln County 89.2% Catawba County 10.8%	10.8%	2
28040	Rutherford County 96.1% Cleveland County 3.9%	3.9%	2
28071	Rowan County 66.8% Cabarrus County 26.6% Stanly County 6.5%	33.2%	3
28078	Mecklenburg County 98.1% Cabarrus County 1.9%	1.9%	2
28080	Lincoln County 99.5% Gaston County 0.5%	0.5%	2
28081	Cabarrus County 51.3% Rowan County 48.7%	48.7%	2
28083	Cabarrus County 75.1% Rowan County 24.9%	24.9%	2
28086	Cleveland County 74.2% Gaston County 25.8%	25.8%	2
28090	Cleveland County 94.3% Lincoln County 3.4% Burke County 1.2% Catawba County 1.1%	5.7%	4
28092	Lincoln County 87.5% Gaston County 7.9% Catawba County 4.6%	12.5%	3
28097	Stanly County 98.0% Cabarrus County 2.0%	2.0%	2
28103	Union County 97.5% Anson County 2.5%	2.5%	2
28104	Union County 96.9% Mecklenburg County 3.1%	3.1%	2
28105	Mecklenburg County 98.6% Union County 1.4%	1.4%	2
28107	Cabarrus County 91.5% Mecklenburg County 3.8% Union County 3.1% Stanly County 1.6%	8.5%	4
28114	Cleveland County 54.2% Rutherford County 45.8%	45.8%	2
28115	Iredell County 70.5% Rowan County 29.5%	29.5%	2
28124	Cabarrus County 86.2% Stanly County 13.8%	13.8%	2
28125	Rowan County 95.1% Iredell County 4.9%	4.9%	2
28127	Stanly County 63.3% Montgomery County 30.0% Davidson County 5.6% Rowan County 1.0% Randolph County under 0.1%	36.7%	5
28133	Anson County 95.7% Union County 4.3%	4.3%	2
28137	Stanly County 56.6% Rowan County 43.4%	43.4%	2
28138	Rowan County 74.9% Cabarrus County 25.1%	25.1%	2
28139	Rutherford County 86.7% Polk County 13.3%	13.3%	2
28150	Cleveland County 99.8% Rutherford County 0.2%	0.2%	2
28164	Gaston County 62.7% Lincoln County 37.3%	37.3%	2
28167	Rutherford County 93.3% McDowell County 6.7%	6.7%	2
28168	Lincoln County 59.4% Catawba County 40.4% Burke County 0.2% Cleveland County under 0.1%	40.6%	4
28213	Mecklenburg County 98.2% Cabarrus County 1.9%	1.9%	2
28215	Mecklenburg County 92.9% Cabarrus County 7.1%	7.1%	2
28227	Mecklenburg County 99.2% Union County 0.8%	0.8%	2
28262	Mecklenburg County 99.1% Cabarrus County 0.9%	0.9%	2
28269	Mecklenburg County 96.9% Cabarrus County 3.1%	3.1%	2
28304	Cumberland County 97.6% Hoke County 2.4%	2.4%	2
28306	Cumberland County 95.2% Bladen County 3.7% Hoke County 1.1%	4.8%	3
28312	Cumberland County 85.6% Bladen County 14.4%	14.4%	2
28315	Moore County 66.3% Hoke County 33.7%	33.7%	2
28318	Sampson County 68.8% Cumberland County 31.2%	31.2%	2
28320	Bladen County 94.2% Columbus County 5.8%	5.8%	2
28326	Harnett County 56.6% Moore County 36.0% Lee County 7.5%	43.4%	3
28334	Sampson County 46.9% Harnett County 36.8% Cumberland County 8.2% Johnston County 8.1%	53.1%	4
28341	Sampson County 59.0% Duplin County 41.0%	41.0%	2
28344	Sampson County 61.3% Cumberland County 38.7%	38.7%	2
28345	Richmond County 96.4% Scotland County 3.6%	3.6%	2
28347	Richmond County 84.1% Moore County 15.9%	15.9%	2
28351	Scotland County 97.0% Richmond County 3.0%	3.0%	2
28356	Cumberland County 79.3% Harnett County 20.7%	20.7%	2
28357	Robeson County 54.7% Hoke County 45.3%	45.3%	2
28363	Scotland County 73.9% Richmond County 26.1%	26.1%	2
28364	Robeson County 91.6% Scotland County 7.0% Hoke County 1.4%	8.4%	3
28365	Duplin County 48.8% Wayne County 46.4% Sampson County 4.8%	51.2%	3
28366	Sampson County 79.6% Johnston County 20.4%	20.4%	2
28371	Robeson County 78.5% Cumberland County 19.4% Hoke County 2.1%	21.5%	3
28377	Hoke County 51.5% Robeson County 48.5%	48.5%	2
28382	Sampson County 87.1% Cumberland County 12.8% Bladen County under 0.1%	12.9%	3
28384	Robeson County 83.9% Bladen County 13.0% Cumberland County 3.1%	16.1%	3
28386	Robeson County 58.6% Hoke County 41.4%	41.4%	2
28390	Harnett County 52.3% Cumberland County 47.7%	47.7%	2
28391	Cumberland County 99.3% Sampson County 0.7%	0.7%	2
28393	Sampson County 99.4% Duplin County 0.6%	0.6%	2
28399	Bladen County 93.8% Cumberland County 6.2%	6.2%	2
28401	New Hanover County 78.2% Pender County 21.8%	21.8%	2
28411	New Hanover County 79.9% Pender County 20.1%	20.1%	2
28423	Columbus County 96.1% Bladen County 3.9%	3.9%	2
28433	Bladen County 73.7% Columbus County 26.3%	26.3%	2
28436	Columbus County 100.0% Brunswick County under 0.1%	under 0.1%	2
28438	Columbus County 95.5% Bladen County 4.5%	4.5%	2
28441	Sampson County 52.9% Bladen County 47.1%	47.1%	2
28444	Sampson County 54.6% Bladen County 42.2% Duplin County 3.2%	45.4%	3
28445	Onslow County 91.0% Pender County 9.0%	9.0%	2
28447	Bladen County 41.8% Sampson County 30.9% Pender County 27.4%	58.2%	3
28448	Bladen County 95.4% Pender County 4.6%	4.6%	2
28453	Duplin County 75.3% Sampson County 24.7%	24.7%	2
28454	Onslow County 53.1% Pender County 46.9%	46.9%	2
28456	Columbus County 43.6% Bladen County 43.4% Brunswick County 13.0%	56.4%	3
28458	Duplin County 69.5% Sampson County 30.5%	30.5%	2
28466	Duplin County 62.9% Pender County 37.1%	37.1%	2
28478	Pender County 91.6% Sampson County 7.1% Duplin County 1.3%	8.4%	3
28501	Lenoir County 74.5% Jones County 25.5%	25.5%	2
28504	Lenoir County 98.0% Jones County 2.0%	2.0%	2
28513	Pitt County 87.0% Greene County 12.9%	12.9%	2
28518	Duplin County 88.8% Onslow County 11.2%	11.2%	2
28521	Duplin County 96.5% Onslow County 3.5%	3.5%	2
28525	Lenoir County 92.4% Duplin County 7.6%	7.6%	2
28526	Craven County 62.6% Jones County 31.6% Lenoir County 5.8%	37.4%	3
28530	Pitt County 39.5% Lenoir County 35.7% Craven County 16.5% Greene County 8.3%	60.5%	4
28538	Greene County 82.4% Lenoir County 17.6%	17.6%	2
28551	Lenoir County 58.0% Wayne County 26.9% Greene County 15.0%	42.0%	3
28555	Onslow County 50.9% Jones County 49.0% Carteret County under 0.1%	49.1%	3
28560	Craven County 62.6% Pamlico County 37.4%	37.4%	2
28562	Craven County 92.0% Jones County 8.0%	8.0%	2
28572	Duplin County 52.3% Lenoir County 26.8% Jones County 20.5% Onslow County 0.3%	47.7%	4
28573	Jones County 98.4% Craven County 1.6%	1.6%	2
28574	Onslow County 92.2% Duplin County 4.0% Jones County 3.8%	7.8%	3
28578	Wayne County 57.6% Lenoir County 27.8% Duplin County 14.5%	42.4%	3
28580	Greene County 99.6% Lenoir County 0.4%	0.4%	2
28582	Onslow County 57.2% Carteret County 42.8%	42.8%	2
28584	Carteret County 71.7% Onslow County 28.3%	28.3%	2
28586	Craven County 91.3% Beaufort County 4.8% Pitt County 3.9%	8.7%	3
28601	Catawba County 64.0% Burke County 15.5% Alexander County 12.9% Caldwell County 7.5%	36.0%	4
28602	Catawba County 80.8% Burke County 19.2%	19.2%	2
28604	Watauga County 57.6% Avery County 42.4%	42.4%	2
28605	Watauga County 71.3% Caldwell County 22.5% Avery County 6.2%	28.7%	3
28606	Wilkes County 88.9% Caldwell County 11.1%	11.1%	2
28611	Caldwell County 81.0% Avery County 19.0%	19.0%	2
28612	Burke County 98.3% Catawba County 1.7%	1.7%	2
28618	Watauga County 88.5% Wilkes County 11.5%	11.5%	2
28621	Surry County 68.0% Wilkes County 32.0%	32.0%	2
28622	Avery County 99.8% Watauga County 0.3%	0.3%	2
28623	Alleghany County 99.9% Surry County 0.1%	0.1%	2
28624	Wilkes County 99.7% Caldwell County 0.3%	0.3%	2
28625	Iredell County 98.1% Alexander County 1.5% Davie County 0.4%	1.9%	3
28630	Caldwell County 98.5% Alexander County 1.5%	1.5%	2
28631	Ashe County 91.0% Alleghany County 9.0%	9.0%	2
28634	Iredell County 89.5% Davie County 9.5% Yadkin County 0.9%	10.5%	3
28636	Alexander County 93.4% Iredell County 6.6%	6.6%	2
28640	Ashe County 99.8% Wilkes County 0.2%	0.2%	2
28642	Yadkin County 88.5% Wilkes County 11.5%	11.5%	2
28644	Alleghany County 53.8% Ashe County 45.1% Wilkes County 1.1%	46.2%	3
28645	Caldwell County 95.9% Watauga County 2.4% Burke County 1.0% Wilkes County 0.7%	4.1%	4
28650	Catawba County 81.7% Lincoln County 18.3%	18.3%	2
28654	Wilkes County 92.5% Alexander County 7.5%	7.5%	2
28655	Burke County 99.3% Caldwell County 0.4% McDowell County 0.3%	0.7%	3
28657	Avery County 84.0% Burke County 15.2% McDowell County 0.9%	16.0%	3
28667	Caldwell County 87.1% Burke County 12.9%	12.9%	2
28673	Catawba County 99.5% Lincoln County 0.5%	0.5%	2
28675	Alleghany County 99.1% Grayson County, VA 0.7% Wilkes County 0.2%	0.9%	3
28676	Surry County 76.2% Wilkes County 23.8%	23.8%	2
28678	Iredell County 53.8% Alexander County 46.2%	46.2%	2
28679	Watauga County 96.1% Avery County 3.9%	3.9%	2
28683	Surry County 73.0% Wilkes County 27.1%	27.1%	2
28684	Ashe County 55.9% Watauga County 44.1%	44.1%	2
28689	Iredell County 64.2% Wilkes County 17.1% Yadkin County 10.1% Alexander County 8.6%	35.8%	4
28698	Watauga County 76.2% Ashe County 23.8%	23.8%	2
28701	Buncombe County 96.0% Madison County 4.0%	4.0%	2
28702	Graham County 95.5% Swain County 4.5%	4.5%	2
28704	Buncombe County 93.6% Henderson County 6.4%	6.4%	2
28705	Mitchell County 99.7% Yancey County 0.3%	0.3%	2
28711	Buncombe County 79.3% McDowell County 10.7% Rutherford County 9.2% Henderson County 0.8%	20.7%	4
28713	Swain County 99.8% Macon County 0.2%	0.2%	2
28719	Swain County 92.3% Jackson County 7.7%	7.7%	2
28731	Henderson County 80.5% Polk County 19.5%	19.5%	2
28732	Henderson County 63.7% Buncombe County 36.3%	36.3%	2
28734	Macon County 98.7% Clay County 1.3%	1.3%	2
28739	Henderson County 95.3% Transylvania County 4.7%	4.7%	2
28740	Yancey County 54.6% Mitchell County 45.4%	45.4%	2
28741	Macon County 87.0% Jackson County 13.0%	13.0%	2
28742	Henderson County 98.8% Transylvania County 1.3%	1.3%	2
28743	Madison County 81.2% Haywood County 18.8%	18.8%	2
28748	Buncombe County 89.1% Madison County 10.9%	10.9%	2
28749	McDowell County 72.9% Mitchell County 27.1%	27.1%	2
28751	Haywood County 78.3% Jackson County 21.7%	21.7%	2
28752	McDowell County 99.8% Rutherford County 0.1%	0.1%	2
28753	Madison County 97.8% Buncombe County 2.2%	2.2%	2
28754	Madison County 94.6% Yancey County 5.4%	5.4%	2
28756	Polk County 98.9% Rutherford County 1.1%	1.1%	2
28759	Henderson County 98.4% Buncombe County 1.6%	1.6%	2
28761	McDowell County 71.4% Burke County 28.6%	28.6%	2
28766	Transylvania County 87.3% Henderson County 12.7%	12.7%	2
28771	Graham County 99.0% Swain County 1.0%	1.0%	2
28773	Polk County 73.6% Henderson County 26.4%	26.4%	2
28774	Transylvania County 61.9% Jackson County 38.1%	38.1%	2
28777	Mitchell County 79.6% Avery County 14.9% McDowell County 3.3% Yancey County 2.1%	20.4%	4
28787	Buncombe County 94.6% Madison County 5.4%	5.4%	2
28789	Jackson County 72.5% Swain County 27.4%	27.4%	2
28792	Henderson County 96.8% Buncombe County 3.1% Polk County under 0.1%	3.2%	3
28902	Clay County 66.8% Cherokee County 33.3%	33.3%	2
28906	Cherokee County 100.0% Clay County under 0.1%	under 0.1%	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.

Try it free