ZIP codes and county lines in Virginia

320 of the 907 ZIP code areas in Virginia, or 35.3%, 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: 907
In more than one county: 320
At least 5% in a second county: 236
Cross a state line: 7

How Virginia compares

Virginia ranks 21 of 52 (the 50 states, DC and Puerto Rico) by the share of its ZIP code areas that overlap more than one county. 130 of its counties have at least one split ZIP code area along an edge. 7 of its ZIP code areas also reach into North Carolina, Tennessee and West Virginia, so a ZIP list that is meant to stop at the state line does not.

Counties with the most split ZIP code areas

Albemarle County: 16 ZIP codes shared with another county
Fairfax County: 16 ZIP codes shared with another county
Augusta County: 14 ZIP codes shared with another county
Carroll County: 14 ZIP codes shared with another county
Fauquier County: 14 ZIP codes shared with another county

Every split ZIP code area in Virginia

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
20106	Rappahannock County 71.8% Culpeper County 21.1% Fauquier County 7.1%	28.2%	3
20110	Manassas city 76.7% Prince William County 23.3%	23.3%	2
20111	Prince William County 81.5% Manassas Park city 18.5%	18.5%	2
20117	Loudoun County 89.4% Fauquier County 10.6%	10.6%	2
20119	Fauquier County 99.0% Prince William County 1.0%	1.0%	2
20120	Fairfax County 89.8% Loudoun County 10.2%	10.2%	2
20130	Clarke County 54.0% Fauquier County 23.4% Loudoun County 22.6%	46.0%	3
20135	Clarke County 60.7% Loudoun County 38.5% Jefferson County, WV 0.7%	39.3%	3
20137	Fauquier County 81.8% Prince William County 18.2%	18.2%	2
20169	Prince William County 97.0% Fauquier County 3.0%	3.0%	2
20181	Prince William County 93.5% Fauquier County 6.5%	6.5%	2
20184	Loudoun County 56.1% Fauquier County 43.9%	43.9%	2
20186	Fauquier County 98.3% Culpeper County 1.6%	1.6%	2
22030	Fairfax County 76.1% Fairfax city 23.9%	23.9%	2
22031	Fairfax County 82.4% Fairfax city 17.6%	17.6%	2
22032	Fairfax County 95.4% Fairfax city 4.6%	4.6%	2
22042	Fairfax County 99.0% Falls Church city 0.9%	0.9%	2
22043	Fairfax County 98.8% Falls Church city 1.2%	1.2%	2
22044	Fairfax County 94.2% Falls Church city 5.8%	5.8%	2
22046	Falls Church city 66.3% Fairfax County 33.7%	33.7%	2
22066	Fairfax County 99.1% Loudoun County 0.9%	0.9%	2
22101	Fairfax County 99.5% Arlington County 0.5%	0.5%	2
22134	Stafford County 77.4% Prince William County 22.6%	22.6%	2
22203	Arlington County 99.1% Fairfax County 0.9%	0.9%	2
22206	Arlington County 97.0% Alexandria city 3.0%	3.0%	2
22207	Arlington County 99.4% Fairfax County 0.6%	0.6%	2
22302	Alexandria city 95.7% Fairfax County 4.3%	4.3%	2
22304	Alexandria city 96.6% Fairfax County 3.4%	3.4%	2
22311	Alexandria city 75.8% Fairfax County 24.2%	24.2%	2
22312	Fairfax County 91.6% Alexandria city 8.4%	8.4%	2
22406	Stafford County 95.3% Fauquier County 4.7%	4.7%	2
22407	Spotsylvania County 97.4% Culpeper County 2.5% Fredericksburg city 0.1%	2.6%	3
22408	Spotsylvania County 83.3% Caroline County 16.7% Fredericksburg city under 0.1%	16.7%	3
22435	Northumberland County 93.1% Richmond County 5.5% Westmoreland County 1.4%	6.9%	3
22437	King and Queen County 66.1% Essex County 33.9%	33.9%	2
22438	Essex County 88.9% Caroline County 11.1%	11.1%	2
22443	Westmoreland County 99.7% King George County 0.3%	0.3%	2
22473	Northumberland County 96.7% Lancaster County 3.3%	3.3%	2
22482	Northumberland County 63.6% Lancaster County 36.4%	36.4%	2
22485	King George County 99.8% Westmoreland County 0.2%	0.2%	2
22503	Lancaster County 98.0% Northumberland County 2.0%	2.0%	2
22504	Essex County 81.2% Middlesex County 18.8%	18.8%	2
22508	Orange County 90.2% Spotsylvania County 9.8%	9.8%	2
22514	Caroline County 97.6% King and Queen County 2.4%	2.4%	2
22520	Westmoreland County 97.4% Richmond County 2.6%	2.6%	2
22546	Caroline County 93.8% Hanover County 4.6% Spotsylvania County 1.5%	6.2%	3
22551	Spotsylvania County 99.4% Orange County 0.6%	0.6%	2
22556	Stafford County 99.2% Fauquier County 0.8%	0.8%	2
22560	Essex County 88.7% King and Queen County 11.3%	11.3%	2
22567	Orange County 99.3% Spotsylvania County 0.7%	0.7%	2
22572	Richmond County 91.3% Westmoreland County 8.7%	8.7%	2
22580	Caroline County 89.9% Spotsylvania County 10.1%	10.1%	2
22601	Winchester city 94.0% Frederick County 6.0%	6.0%	2
22610	Warren County 100.0% Page County under 0.1%	under 0.1%	2
22630	Warren County 97.6% Frederick County 1.6% Clarke County 0.6% Fauquier County 0.2% Rappahannock County under 0.1%	2.4%	5
22642	Warren County 52.1% Fauquier County 47.9%	47.9%	2
22645	Frederick County 57.0% Warren County 43.0%	43.0%	2
22654	Frederick County 68.2% Shenandoah County 31.8%	31.8%	2
22655	Frederick County 91.6% Warren County 8.4%	8.4%	2
22657	Shenandoah County 86.0% Warren County 14.0%	14.0%	2
22663	Clarke County 75.3% Frederick County 16.1% Warren County 8.6%	24.7%	3
22701	Culpeper County 78.4% Orange County 14.3% Madison County 7.3%	21.6%	3
22713	Culpeper County 67.6% Rappahannock County 32.4%	32.4%	2
22716	Rappahannock County 97.1% Culpeper County 2.9%	2.9%	2
22733	Culpeper County 50.4% Orange County 47.7% Madison County 1.9%	49.6%	3
22734	Fauquier County 65.4% Culpeper County 34.6%	34.6%	2
22735	Madison County 62.8% Culpeper County 37.2%	37.2%	2
22740	Rappahannock County 93.8% Culpeper County 4.3% Madison County 1.9%	6.2%	3
22801	Rockingham County 68.7% Harrisonburg city 31.3%	31.3%	2
22802	Rockingham County 93.3% Harrisonburg city 6.7%	6.7%	2
22812	Rockingham County 59.0% Augusta County 41.0%	41.0%	2
22815	Rockingham County 97.0% Shenandoah County 3.0%	3.0%	2
22827	Rockingham County 77.6% Page County 22.4%	22.4%	2
22841	Rockingham County 98.1% Augusta County 1.9%	1.9%	2
22844	Shenandoah County 80.8% Rockingham County 19.2%	19.2%	2
22849	Page County 87.9% Rockingham County 12.1%	12.1%	2
22853	Rockingham County 91.5% Shenandoah County 8.5%	8.5%	2
22901	Albemarle County 94.6% Charlottesville city 5.4%	5.4%	2
22902	Albemarle County 94.3% Charlottesville city 4.3% Fluvanna County 1.4%	5.7%	3
22903	Albemarle County 93.3% Charlottesville city 6.7%	6.7%	2
22904	Albemarle County 90.7% Charlottesville city 9.3%	9.3%	2
22920	Nelson County 58.3% Albemarle County 37.0% Augusta County 4.8%	41.7%	3
22922	Nelson County 94.8% Amherst County 5.2%	5.2%	2
22923	Albemarle County 43.2% Orange County 42.0% Greene County 14.8%	56.8%	3
22935	Greene County 62.6% Albemarle County 37.4%	37.4%	2
22938	Nelson County 91.0% Albemarle County 9.1%	9.1%	2
22940	Albemarle County 75.5% Greene County 24.5%	24.5%	2
22942	Louisa County 51.9% Orange County 34.7% Albemarle County 13.4%	48.1%	3
22947	Albemarle County 88.2% Louisa County 6.6% Fluvanna County 5.2%	11.8%	3
22952	Augusta County 98.8% Nelson County 1.1%	1.1%	2
22958	Nelson County 97.3% Augusta County 2.7%	2.7%	2
22960	Orange County 80.4% Madison County 16.4% Spotsylvania County 3.2%	19.6%	3
22967	Nelson County 80.3% Amherst County 19.7%	19.7%	2
22968	Greene County 91.0% Albemarle County 7.3% Orange County 1.6%	9.0%	3
22969	Nelson County 53.3% Albemarle County 46.7%	46.7%	2
22972	Orange County 95.3% Madison County 4.7%	4.7%	2
22973	Greene County 89.6% Madison County 10.4%	10.4%	2
22974	Fluvanna County 76.7% Louisa County 14.8% Albemarle County 8.5%	23.3%	3
22980	Augusta County 79.9% Waynesboro city 20.1%	20.1%	2
23002	Amelia County 99.2% Nottoway County 0.8%	0.8%	2
23015	Hanover County 77.0% Spotsylvania County 14.5% Caroline County 7.6% Louisa County 0.9%	23.0%	4
23024	Louisa County 81.9% Spotsylvania County 13.3% Hanover County 4.8%	18.1%	3
23030	Charles City County 99.3% Henrico County 0.7%	0.7%	2
23038	Goochland County 40.8% Cumberland County 39.2% Fluvanna County 20.0%	59.2%	3
23040	Cumberland County 90.5% Buckingham County 9.5%	9.5%	2
23047	Hanover County 88.4% Caroline County 11.6%	11.6%	2
23050	Mathews County 93.0% Gloucester County 7.0%	7.0%	2
23059	Hanover County 59.3% Henrico County 38.9% Goochland County 1.9%	40.7%	3
23065	Goochland County 76.1% Louisa County 23.9%	23.9%	2
23069	Hanover County 41.7% King William County 35.4% Caroline County 22.9%	58.3%	3
23083	Amelia County 98.4% Nottoway County 1.6%	1.6%	2
23084	Fluvanna County 73.9% Goochland County 19.0% Louisa County 7.1%	26.1%	3
23089	New Kent County 88.0% James City County 12.0%	12.0%	2
23093	Louisa County 94.9% Goochland County 4.3% Fluvanna County 0.8%	5.1%	3
23102	Goochland County 75.2% Louisa County 18.2% Hanover County 6.6%	24.8%	3
23112	Chesterfield County 99.3% Powhatan County 0.7%	0.7%	2
23113	Chesterfield County 53.5% Powhatan County 46.3% Richmond city 0.1%	46.5%	3
23117	Louisa County 89.9% Spotsylvania County 6.9% Goochland County 3.3%	10.1%	3
23120	Chesterfield County 93.6% Powhatan County 6.4%	6.4%	2
23123	Buckingham County 91.7% Cumberland County 8.3%	8.3%	2
23128	Mathews County 83.4% Gloucester County 16.6%	16.6%	2
23139	Powhatan County 98.7% Cumberland County 1.3%	1.3%	2
23140	New Kent County 57.6% Charles City County 42.4%	42.4%	2
23146	Hanover County 78.3% Goochland County 21.6%	21.6%	2
23148	King and Queen County 93.5% Essex County 6.5%	6.5%	2
23149	Middlesex County 42.8% Gloucester County 39.4% King and Queen County 17.8%	57.2%	3
23153	Goochland County 99.7% Louisa County 0.3%	0.3%	2
23177	King and Queen County 88.5% King William County 11.5%	11.5%	2
23181	King William County 91.0% New Kent County 9.0%	9.0%	2
23185	James City County 54.6% York County 31.5% Williamsburg city 13.5% Charles City County 0.4%	45.4%	4
23188	James City County 73.0% York County 25.8% Williamsburg city 1.2%	27.0%	3
23192	Hanover County 95.9% Louisa County 4.1%	4.1%	2
23222	Henrico County 58.5% Richmond city 41.5%	41.5%	2
23223	Henrico County 76.6% Richmond city 23.4%	23.4%	2
23224	Richmond city 94.5% Chesterfield County 5.5%	5.5%	2
23225	Richmond city 80.5% Chesterfield County 19.5%	19.5%	2
23226	Richmond city 55.8% Henrico County 44.3%	44.3%	2
23227	Henrico County 73.3% Richmond city 26.7%	26.7%	2
23230	Henrico County 71.6% Richmond city 28.4%	28.4%	2
23231	Henrico County 94.4% Charles City County 4.3% Richmond city 1.3%	5.6%	3
23233	Henrico County 73.0% Goochland County 26.9%	26.9%	2
23234	Chesterfield County 62.7% Richmond city 37.3%	37.3%	2
23235	Chesterfield County 73.6% Richmond city 26.4%	26.4%	2
23238	Goochland County 57.5% Henrico County 42.5%	42.5%	2
23321	Chesapeake city 99.8% Suffolk city 0.1% Portsmouth city under 0.1%	0.2%	3
23430	Isle of Wight County 97.0% Surry County 3.0%	3.0%	2
23462	Virginia Beach city 100.0% Norfolk city under 0.1%	under 0.1%	2
23603	Newport News city 97.3% York County 2.8%	2.8%	2
23605	Newport News city 85.0% Hampton city 15.1%	15.1%	2
23607	Newport News city 100.0% Hampton city under 0.1%	under 0.1%	2
23665	Hampton city 89.6% York County 10.4%	10.4%	2
23803	Dinwiddie County 44.4% Chesterfield County 40.9% Petersburg city 14.8%	55.6%	3
23805	Prince George County 42.9% Dinwiddie County 40.3% Petersburg city 16.9%	57.1%	3
23824	Nottoway County 76.0% Dinwiddie County 12.5% Brunswick County 8.8% Lunenburg County 2.7%	24.0%	4
23830	Dinwiddie County 51.7% Sussex County 27.1% Prince George County 21.1%	48.3%	3
23833	Dinwiddie County 73.7% Amelia County 26.3%	26.3%	2
23834	Chesterfield County 68.4% Colonial Heights city 31.6%	31.6%	2
23837	Southampton County 92.7% Sussex County 7.3%	7.3%	2
23842	Prince George County 82.6% Sussex County 15.4% Surry County 2.0%	17.4%	3
23847	Greensville County 78.7% Brunswick County 6.8% Southampton County 6.7% Sussex County 5.4% Emporia city 2.5%	21.3%	5
23850	Dinwiddie County 70.4% Amelia County 29.6%	29.6%	2
23851	Southampton County 78.8% Isle of Wight County 13.6% Franklin city 7.6%	21.2%	3
23856	Brunswick County 94.9% Greensville County 5.1%	5.1%	2
23860	Prince George County 77.1% Hopewell city 22.9%	22.9%	2
23866	Southampton County 64.0% Isle of Wight County 35.5% Surry County 0.5%	36.0%	3
23867	Sussex County 58.3% Greensville County 41.7%	41.7%	2
23881	Surry County 70.8% Prince George County 29.2%	29.2%	2
23882	Sussex County 79.6% Dinwiddie County 20.4%	20.4%	2
23888	Sussex County 43.3% Surry County 28.9% Southampton County 27.9%	56.8%	3
23890	Sussex County 80.0% Surry County 20.0%	20.0%	2
23894	Dinwiddie County 90.8% Nottoway County 9.2%	9.2%	2
23898	Isle of Wight County 50.1% Southampton County 49.9%	49.9%	2
23901	Cumberland County 41.1% Prince Edward County 40.0% Buckingham County 18.9%	58.9%	3
23919	Mecklenburg County 88.9% Brunswick County 11.1%	11.1%	2
23920	Brunswick County 82.5% Mecklenburg County 10.5% Lunenburg County 7.0%	17.6%	3
23922	Nottoway County 77.3% Prince Edward County 22.7%	22.7%	2
23923	Charlotte County 94.3% Prince Edward County 5.8%	5.8%	2
23924	Mecklenburg County 84.9% Lunenburg County 9.3% Charlotte County 5.8%	15.1%	3
23934	Prince Edward County 55.1% Charlotte County 44.9%	44.9%	2
23936	Buckingham County 98.0% Cumberland County 2.0%	2.0%	2
23937	Charlotte County 77.6% Lunenburg County 22.4%	22.4%	2
23938	Brunswick County 60.0% Lunenburg County 40.0%	40.0%	2
23942	Prince Edward County 61.4% Lunenburg County 38.6%	38.6%	2
23947	Lunenburg County 51.7% Charlotte County 37.3% Prince Edward County 10.9%	48.3%	3
23950	Mecklenburg County 84.4% Brunswick County 15.6%	15.6%	2
23954	Prince Edward County 64.9% Lunenburg County 35.1%	35.1%	2
23958	Appomattox County 45.7% Prince Edward County 42.7% Charlotte County 11.6%	54.3%	3
23960	Prince Edward County 97.1% Appomattox County 2.9%	2.9%	2
23962	Charlotte County 80.8% Halifax County 19.2%	19.2%	2
23963	Charlotte County 72.6% Campbell County 23.5% Appomattox County 3.9%	27.4%	3
23964	Charlotte County 88.0% Mecklenburg County 12.0%	12.0%	2
23966	Prince Edward County 79.7% Amelia County 19.1% Nottoway County 1.2%	20.3%	3
23970	Mecklenburg County 78.2% Lunenburg County 21.8%	21.8%	2
24012	Roanoke city 49.3% Botetourt County 27.4% Roanoke County 23.2%	50.7%	3
24014	Roanoke County 72.2% Roanoke city 27.8%	27.8%	2
24015	Roanoke city 96.9% Roanoke County 3.1%	3.1%	2
24018	Roanoke County 93.8% Roanoke city 6.2%	6.2%	2
24019	Roanoke County 65.9% Botetourt County 23.8% Roanoke city 10.3%	34.1%	3
24053	Patrick County 96.4% Carroll County 3.6%	3.6%	2
24054	Henry County 67.3% Pittsylvania County 32.6%	32.6%	2
24055	Henry County 78.6% Franklin County 12.2% Patrick County 9.1%	21.4%	3
24059	Roanoke County 88.6% Franklin County 10.9% Montgomery County 0.5%	11.4%	3
24064	Bedford County 68.8% Botetourt County 31.3%	31.3%	2
24065	Franklin County 84.5% Roanoke County 15.5%	15.5%	2
24066	Botetourt County 98.3% Rockbridge County 1.7%	1.7%	2
24070	Roanoke County 48.0% Craig County 47.0% Montgomery County 4.9%	52.0%	3
24079	Floyd County 96.9% Franklin County 3.1%	3.1%	2
24084	Pulaski County 74.5% Bland County 25.5%	25.5%	2
24085	Botetourt County 98.4% Alleghany County 1.6%	1.6%	2
24087	Montgomery County 96.5% Roanoke County 3.5%	3.5%	2
24088	Franklin County 84.2% Patrick County 15.8%	15.8%	2
24091	Floyd County 94.5% Franklin County 3.9% Patrick County 1.6%	5.5%	3
24101	Franklin County 91.6% Bedford County 7.3% Roanoke County 1.1%	8.4%	3
24102	Franklin County 92.4% Henry County 7.6%	7.6%	2
24105	Floyd County 65.6% Carroll County 34.4%	34.4%	2
24112	Henry County 79.9% Franklin County 12.9% Martinsville city 7.2%	20.1%	3
24120	Patrick County 74.1% Floyd County 17.1% Carroll County 8.8%	25.9%	3
24121	Bedford County 78.4% Franklin County 21.6%	21.6%	2
24124	Giles County 88.0% Bland County 12.0%	12.0%	2
24128	Giles County 71.3% Craig County 28.7%	28.7%	2
24133	Patrick County 99.5% Henry County 0.5%	0.5%	2
24137	Franklin County 80.2% Pittsylvania County 19.8%	19.8%	2
24138	Floyd County 50.0% Montgomery County 50.0%	50.0%	2
24139	Pittsylvania County 76.4% Bedford County 23.6%	23.6%	2
24141	Pulaski County 47.3% Montgomery County 30.5% Radford city 14.6% Floyd County 7.6%	52.7%	4
24149	Montgomery County 66.2% Floyd County 33.8%	33.8%	2
24153	Roanoke County 84.8% Salem city 14.3% Botetourt County 0.9%	15.2%	3
24162	Montgomery County 97.8% Floyd County 2.2%	2.2%	2
24165	Henry County 51.3% Patrick County 48.7%	48.7%	2
24175	Botetourt County 95.3% Roanoke County 4.7%	4.7%	2
24179	Bedford County 80.8% Roanoke County 18.8% Roanoke city 0.4%	19.2%	3
24202	Washington County 79.7% Scott County 18.2% Bristol city 2.1%	20.3%	3
24217	Dickenson County 77.3% Buchanan County 22.7%	22.7%	2
24219	Wise County 68.4% Lee County 24.5% Scott County 7.1%	31.6%	3
24221	Lee County 61.0% Scott County 39.0%	39.0%	2
24225	Russell County 99.0% Dickenson County 1.0%	1.0%	2
24230	Wise County 58.4% Dickenson County 34.1% Scott County 7.5%	41.6%	3
24236	Washington County 95.9% Smyth County 4.1%	4.1%	2
24237	Dickenson County 76.5% Russell County 23.5%	23.5%	2
24244	Scott County 82.7% Lee County 17.4%	17.4%	2
24256	Dickenson County 82.2% Buchanan County 17.8%	17.8%	2
24258	Scott County 93.4% Washington County 6.6%	6.6%	2
24260	Russell County 78.5% Buchanan County 21.5%	21.5%	2
24271	Scott County 99.2% Russell County 0.8%	0.8%	2
24273	Wise County 88.4% Norton city 11.6%	11.6%	2
24283	Wise County 70.1% Russell County 16.5% Dickenson County 13.4%	29.9%	3
24312	Carroll County 69.8% Wythe County 30.2%	30.2%	2
24313	Wythe County 89.7% Pulaski County 10.3%	10.3%	2
24314	Bland County 90.6% Tazewell County 9.4%	9.4%	2
24315	Bland County 95.7% Giles County 4.3%	4.3%	2
24316	Tazewell County 90.8% Smyth County 9.2%	9.2%	2
24317	Carroll County 93.5% Patrick County 6.5%	6.5%	2
24318	Bland County 66.3% Smyth County 33.7%	33.7%	2
24319	Smyth County 79.3% Washington County 20.8%	20.8%	2
24324	Pulaski County 75.7% Wythe County 24.3%	24.3%	2
24328	Carroll County 99.5% Patrick County 0.5%	0.5%	2
24330	Grayson County 78.6% Carroll County 21.4%	21.4%	2
24333	Grayson County 51.6% Carroll County 42.7% Galax city 5.7%	48.4%	3
24343	Carroll County 95.1% Patrick County 2.6% Wythe County 2.4%	4.9%	3
24347	Pulaski County 87.2% Carroll County 8.9% Montgomery County 3.9%	12.8%	3
24350	Wythe County 49.3% Carroll County 30.1% Grayson County 20.6%	50.7%	3
24352	Carroll County 98.9% Floyd County 1.1%	1.1%	2
24360	Wythe County 98.8% Carroll County 1.2%	1.2%	2
24368	Wythe County 72.6% Smyth County 27.4%	27.4%	2
24370	Smyth County 79.9% Washington County 20.1%	20.1%	2
24378	Grayson County 80.9% Smyth County 19.1%	19.1%	2
24380	Floyd County 93.0% Carroll County 7.0%	7.0%	2
24401	Augusta County 85.0% Staunton city 15.0%	15.0%	2
24416	Rockbridge County 89.6% Buena Vista city 10.4%	10.4%	2
24422	Alleghany County 95.9% Botetourt County 4.1% Bath County under 0.1%	4.1%	3
24426	Alleghany County 95.0% Craig County 3.5% Covington city 1.5%	5.0%	3
24432	Augusta County 89.0% Bath County 11.0%	11.0%	2
24439	Rockbridge County 71.6% Augusta County 28.4%	28.4%	2
24441	Augusta County 65.6% Rockingham County 34.4%	34.4%	2
24445	Bath County 79.2% Alleghany County 20.8%	20.8%	2
24450	Rockbridge County 91.0% Botetourt County 7.8% Lexington city 1.1%	9.0%	3
24459	Augusta County 88.1% Rockbridge County 11.9%	11.9%	2
24472	Rockbridge County 50.6% Augusta County 49.4%	49.4%	2
24482	Augusta County 99.9% Staunton city under 0.1%	under 0.1%	2
24483	Rockbridge County 61.1% Amherst County 36.0% Nelson County 2.9%	38.9%	3
24484	Bath County 88.5% Highland County 11.5%	11.5%	2
24486	Augusta County 91.1% Rockingham County 8.9%	8.9%	2
24487	Highland County 59.2% Bath County 40.8%	40.8%	2
24501	Campbell County 62.9% Lynchburg city 37.1%	37.1%	2
24502	Lynchburg city 57.6% Campbell County 38.1% Bedford County 4.3%	42.4%	3
24503	Bedford County 65.1% Lynchburg city 34.9%	34.9%	2
24504	Campbell County 79.0% Lynchburg city 12.0% Appomattox County 9.1%	21.1%	3
24521	Amherst County 95.8% Nelson County 4.2%	4.2%	2
24522	Appomattox County 96.3% Buckingham County 3.4% Charlotte County 0.3%	3.7%	3
24526	Bedford County 71.7% Amherst County 28.3%	28.3%	2
24528	Campbell County 56.9% Charlotte County 43.1%	43.1%	2
24530	Pittsylvania County 90.3% Henry County 9.7%	9.7%	2
24538	Campbell County 60.4% Appomattox County 39.6%	39.6%	2
24540	Pittsylvania County 77.1% Danville city 22.9%	22.9%	2
24541	Pittsylvania County 65.9% Danville city 34.1%	34.1%	2
24550	Campbell County 87.6% Bedford County 12.4%	12.4%	2
24551	Bedford County 97.2% Campbell County 2.4% Lynchburg city 0.3%	2.8%	3
24553	Buckingham County 44.4% Nelson County 20.8% Amherst County 18.0% Appomattox County 16.7%	55.6%	4
24557	Pittsylvania County 99.8% Halifax County 0.2%	0.2%	2
24562	Buckingham County 67.0% Nelson County 26.4% Albemarle County 6.7%	33.0%	3
24565	Pittsylvania County 83.8% Halifax County 16.2%	16.2%	2
24569	Pittsylvania County 62.3% Halifax County 19.2% Campbell County 18.5%	37.7%	3
24571	Campbell County 60.2% Bedford County 39.8%	39.8%	2
24590	Buckingham County 35.9% Albemarle County 35.7% Fluvanna County 28.4%	64.1%	3
24592	Halifax County 99.7% Pittsylvania County 0.3%	0.3%	2
24593	Appomattox County 98.1% Campbell County 1.9%	1.9%	2
24594	Halifax County 57.2% Pittsylvania County 42.8%	42.8%	2
24597	Halifax County 87.2% Pittsylvania County 12.8%	12.8%	2
24598	Halifax County 96.3% Mecklenburg County 3.7%	3.7%	2
24599	Buckingham County 52.8% Nelson County 47.2%	47.2%	2
24604	Tazewell County 80.0% McDowell County, WV 20.1%	20.1%	2
24607	Buchanan County 62.6% Dickenson County 37.4%	37.4%	2
24609	Tazewell County 50.6% Russell County 49.4%	49.4%	2
24622	Buchanan County 53.2% Tazewell County 34.2% McDowell County, WV 12.7%	46.8%	3
24639	Buchanan County 72.1% Tazewell County 23.8% Russell County 4.1%	27.9%	3
24649	Russell County 99.3% Buchanan County 0.7%	0.7%	2
27048	Rockingham County, NC 98.6% Henry County 1.4%	1.4%	2
28675	Alleghany County, NC 99.1% Grayson County 0.7% Wilkes County, NC 0.2%	0.9%	3
37642	Hawkins County, TN 99.5% Scott County 0.5%	0.5%	2
37752	Claiborne County, TN 99.4% Lee County 0.6%	0.6%	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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