Research · PlainZIP analysis

ZIP Codes That Cross County Lines

Name: ZIP Codes That Cross County Lines: the ZIP-level data
Creator: PlainZIP
License: https://plainzip.com/terms

9,447 of the 33,774 residential ZIP codes of the 50 states, D.C. and Puerto Rico (28.0%) have at least 1% of their land in a second county (Census 2020 ZCTA-county relationship file). A ZIP code follows postal delivery routes, not county borders.

Published October 9, 2026 by PlainZIP · written with AI tools from PlainZIP's database · figures passed the automated checks on October 9, 2026 · method

The share of each state's residential ZIP codes that cross a county line, the 12 highest (states with 20+ ZIP codes)

Where crossing is most common

Residential ZIP codes per state, and the share in more than one county
State	ZIP codes	Cross a county line	Share
South Dakota	375	194	51.7%
Mississippi	427	217	50.8%
Georgia	751	366	48.7%
Nebraska	586	278	47.4%
Iowa	970	453	46.7%
North Dakota	388	179	46.1%
Kansas	704	320	45.5%
Tennessee	636	281	44.2%
Missouri	1,035	444	42.9%
Indiana	807	333	41.3%
Oklahoma	664	254	38.3%
Minnesota	881	335	38.0%
Puerto Rico	132	50	37.9%
Wisconsin	783	295	37.7%
Arkansas	615	222	36.1%
South Carolina	424	152	35.8%
Alabama	656	234	35.7%
North Carolina	853	297	34.8%
Ohio	1,233	424	34.4%
Kentucky	780	267	34.2%
Illinois	1,396	464	33.2%
Michigan	992	325	32.8%
Texas	1,990	650	32.7%
Virginia	903	290	32.1%
Montana	369	117	31.7%
Colorado	527	144	27.3%
Idaho	279	71	25.4%
Louisiana	539	133	24.7%
West Virginia	738	167	22.6%
Oregon	428	82	19.2%
New Mexico	371	71	19.1%
Pennsylvania	1,833	334	18.2%
Wyoming	179	32	17.9%
New York	1,826	297	16.3%
Maryland	477	76	15.9%
Nevada	181	24	13.3%
Washington	605	80	13.2%
Vermont	265	32	12.1%
Florida	1,013	122	12.0%
Arizona	417	45	10.8%
New Jersey	598	58	9.7%
Delaware	68	6	8.8%
California	1,802	146	8.1%
Utah	298	24	8.1%
Alaska	245	12	4.9%
Maine	426	16	3.8%
New Hampshire	247	9	3.6%
Connecticut	288	9	3.1%
Massachusetts	539	15	2.8%
Rhode Island	81	1	1.2%
District of Columbia	57	0	0.0%
Hawaii	97	0	0.0%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (land areas); simplemaps county weights for Connecticut.

The ZIP codes spanning the most counties

Share of each ZIP code's land in each county
ZIP	Town	Counties (share of land)
00650	Florida, PR	Florida Municipio 47.8%; Utuado Municipio 41.6%; Manatí Municipio 4.3%; Ciales Municipio 2.9%; Arecibo Municipio 2.4%; Barceloneta Municipio 1.1%
00725	Caguas, PR	Caguas Municipio 87.1%; Guaynabo Municipio 4.5%; San Lorenzo Municipio 2.8%; San Juan Municipio 2.3%; Aguas Buenas Municipio 1.9%; Trujillo Alto Municipio 1.4%
39573	Perkinston, MS	Stone County 59%; George County 16%; Hancock County 11.5%; Jackson County 8.2%; Pearl River County 2.8%; Harrison County 2.5%
68823	Burwell, NE	Garfield County 55.3%; Loup County 23.3%; Rock County 10.3%; Valley County 6%; Holt County 3%; Custer County 2.2%
23847	Emporia, VA	Greensville County 78.7%; Brunswick County 6.8%; Southampton County 6.7%; Sussex County 5.4%; Emporia city 2.5%
37110	McMinnville, TN	Warren County 78.6%; Grundy County 14.9%; Van Buren County 3%; Cannon County 1.9%; Sequatchie County 1.5%
37144	Petersburg, TN	Lincoln County 58.8%; Marshall County 28%; Bedford County 8.3%; Moore County 3.3%; Giles County 1.7%
38583	Sparta, TN	White County 82%; Putnam County 5.6%; DeKalb County 5.1%; Cumberland County 4.9%; Van Buren County 2.4%
38824	Baldwyn, MS	Prentiss County 47.4%; Lee County 24.7%; Union County 14.2%; Itawamba County 7.8%; Tippah County 6%
39455	Lumberton, MS	Lamar County 45.9%; Pearl River County 31.2%; Forrest County 10.7%; Stone County 8.5%; Marion County 3.8%
50864	Villisca, IA	Montgomery County 65.5%; Page County 19.9%; Taylor County 9%; Adams County 3.9%; Cass County 1.7%
57638	Lemmon, SD	Perkins County 60.2%; Adams County 25.3%; Grant County 5.1%; Sioux County 4.7%; Corson County 4.7%
58638	Hebron, ND	Morton County 42.7%; Mercer County 30.2%; Stark County 16.4%; Grant County 6.7%; Dunn County 4.1%
58649	Reeder, ND	Adams County 72.7%; Hettinger County 11.1%; Harding County 9.5%; Bowman County 4.7%; Slope County 2.1%
59301	Miles City, MT	Custer County 81.3%; Rosebud County 10%; Garfield County 5.1%; Powder River County 2.3%; Prairie County 1.4%
65243	Clark, MO	Randolph County 41.6%; Boone County 25.9%; Audrain County 24.2%; Howard County 5.4%; Monroe County 2.8%
67871	Scott City, KS	Scott County 87.7%; Gove County 4.9%; Logan County 3.2%; Finney County 3.2%; Wichita County 1%
82701	Newcastle, WY	Weston County 76.6%; Niobrara County 9.4%; Campbell County 6.2%; Custer County 4.4%; Pennington County 3.5%
08344	Newfield, NJ	Gloucester County 75.5%; Cumberland County 11.8%; Atlantic County 8.7%; Salem County 4.1%
12010	Amsterdam, NY	Montgomery County 63.7%; Fulton County 18.6%; Saratoga County 11.7%; Schenectady County 6%
12053	Delanson, NY	Schenectady County 68.1%; Albany County 17%; Schoharie County 12.6%; Montgomery County 2.3%
13052	De Ruyter, NY	Madison County 37.4%; Chenango County 32.9%; Cortland County 25.6%; Onondaga County 4.2%
14512	Naples, NY	Ontario County 65.7%; Yates County 27.3%; Steuben County 5.5%; Livingston County 1.5%
17021	East Waterford, PA	Juniata County 77.2%; Perry County 15.8%; Franklin County 5.4%; Huntingdon County 1.6%
17756	Muncy, PA	Lycoming County 81.6%; Northumberland County 13.5%; Montour County 2.9%; Columbia County 2%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (land areas); simplemaps county weights for Connecticut. (tables at data.census.gov)

Method and limits

A ZIP code (2020 ZCTA) crosses a county line when at least 1% of its land lies in a county other than the one with the largest share. Connecticut uses its historical counties.

Every figure on this page is read from the PlainZIP database, built from the files named above; the same figures appear on each ZIP code's own page. The ZIP-level figures are one file: every ZIP code as CSV (columns on the methodology page).