List of U.S. counties bordering eight or more counties
Within the United States, "county equivalents" includes Louisiana parishes, Alaskan boroughs and census areas, and independent cities. The latter are found primarily in Virginia but three are located elsewhere. (Of the many Virginia counties on this list all but one share boundaries with at least one independent city—many of which are enclaved within that single county. Of the three independent cities outside of Virginia, only one--Baltimore, Maryland--does not appear in this list.) Mexican municipios are administrative divisions immediately below the level of the estados, as counties and county equivalents are immediately below the states in the U.S. In Canada, county-level administrative units are known by various names depending on the province and other factors; these include counties, regional county municipalities, districts, metropolitan municipalities, municipal districts, specialized municipalities, special areas, regional municipalities, improvement districts, regional districts and rural municipalities. No attempt has been made to differentiate between these various divisions as to whether or not they "count" toward the total of county boundaries.
This incomplete list is based on the "adjacent counties" section found in most articles on individual U.S. counties insofar as whether it considers contact with or between single points of territory as representing a boundary of "zero" length.
Approximately 180 U.S. counties border eight other counties (nearly 6% of the total); nearly fifty border nine others (1.5%), and nearly twenty border ten or more. Only five of the fifty states (Connecticut, Hawaii, New Jersey, Rhode Island and Vermont), along with Washington, D.C., are not represented here.
The situation of counties that border a very small number of other counties is often (though certainly not always) the result of physical geography and, specifically, water. Coastal locations, peninsulas and islands often border open water on one or more sides rather than another county. By contrast, counties that border a large number of other counties seem largely to be a coincidence of political geography. Some are located in eastern states where many smaller counties exist in a relatively small area and where boundaries are often determined by mountains, rivers and other natural features, while others are to be found among the largest counties of the west, whose boundaries are often based on a highly rectilinear geometry.
- 1 Eight counties
- 1.1 Alabama
- 1.2 Arizona
- 1.3 Arkansas
- 1.4 California
- 1.5 Colorado
- 1.6 Delaware
- 1.7 Florida
- 1.8 Georgia
- 1.9 Idaho
- 1.10 Illinois
- 1.11 Indiana
- 1.12 Iowa
- 1.13 Kansas
- 1.14 Kentucky
- 1.15 Louisiana
- 1.16 Maryland
- 1.17 Massachusetts
- 1.18 Michigan
- 1.19 Minnesota
- 1.20 Mississippi
- 1.21 Missouri
- 1.22 Montana
- 1.23 Nebraska
- 1.24 Nevada
- 1.25 New Mexico
- 1.26 New York
- 1.27 North Carolina
- 1.28 North Dakota
- 1.29 Ohio
- 1.30 Oklahoma
- 1.31 Oregon
- 1.32 Pennsylvania
- 1.33 South Carolina
- 1.34 South Dakota
- 1.35 Tennessee
- 1.36 Texas
- 1.37 Utah
- 1.38 Virginia
- 1.39 Washington
- 1.40 West Virginia
- 1.41 Wisconsin
- 1.42 Wyoming
- 2 Nine counties
- 2.1 Alaska
- 2.2 Arizona
- 2.3 California
- 2.4 Colorado
- 2.5 Florida
- 2.6 Georgia
- 2.7 Idaho
- 2.8 Illinois
- 2.9 Indiana
- 2.10 Kentucky
- 2.11 Louisiana
- 2.12 Michigan
- 2.13 Minnesota
- 2.14 Montana
- 2.15 Nevada
- 2.16 New Hampshire
- 2.17 New Mexico
- 2.18 North Carolina
- 2.19 North Dakota
- 2.20 Oregon
- 2.21 Pennsylvania
- 2.22 South Carolina
- 2.23 South Dakota
- 2.24 Tennessee
- 2.25 Texas
- 2.26 Utah
- 2.27 Virginia
- 2.28 Washington
- 2.29 West Virginia
- 3 Ten counties
- 4 Eleven counties
- 5 Twelve counties
- 6 Thirteen counties
- 7 Fourteen counties
- 8 References
The following counties share boundaries with eight other counties or county equivalents. Those counties may lie in adjacent states, in Canada, or in Mexico.
The following counties share boundaries with nine other counties or county equivalents. Those counties may lie in adjacent states, in Canada, or in Mexico.
- Yukon–Koyukuk Census Area—borders North Slope, Fairbanks North Star, Denali, Matanuska-Susitna and Northwest Arctic boroughs, and Southeast Fairbanks, Bethel, Wade Hampton and Nome census areas, all in Alaska, and Yukon Territory in Canada.
- Apache County—borders Greenlee, Graham and Navajo counties in Arizona; San Juan, McKinley, Cibol and Catron counties in New Mexico; San Juan County in Utah; and Montezuma County in Colorado.
- Cochise County—borders Santa Cruz, Pima, Graham and Greenlee counties in Arizona; Hidalgo County in New Mexico; and the municipios of Agua Prieta, Cananea, Naco and Santa Cruz in the Mexican state of Sonora.
- Kern County—borders Los Angeles, Ventura, Santa Barbara, San Luis Obispo, Monterey, Kings, Tulare, Inyo and San Bernardino counties in California.
- Mono County—borders Inyo, Fresno, Madera, Tuolumne, and Alpine counties in California, and Douglas, Lyon, Mineral and Esmeralda counties in Nevada.
- Lincoln County—borders Washington, Kit Carson, Cheyenne, Crowley, Kiowa, Elbert, El Paso, Arapahoe and Pueblo counties in Colorado.
- Saguache County—borders Chaffee, Fremont, Custer, Huerfano, Rio Grande, Alamosa, Mineral, Hinsdale and Gunnison counties in Colorado.
- Baker County—borders Nassau, Duval, Clay, Union, Bradford and Columbia counties in Florida, and Ware, Clinch and Charlton counties in Georgia.
- Jackson County—borders Gadsden, Liberty, Calhoun, Washington, Bay and Holmes counties in Florida; Geneva and Houston counties in Alabama; and Seminole County in Georgia.
- Okeechobee County—borders Indian River, Martin, St. Lucie, Palm Beach, Glades, Hendry, Highlands, Polk and Osceola counties in Florida.
- Hall County—borders White, Habersham, Banks, Jackson, Barrow, Gwinnett, Forsyth, Dawson and Lumpkin counties in Georgia.
- Blaine County—borders Butte, Bingham, Power, Cassia, Minidoka, Lincoln, Camas, Elmore and Custer counties in Idaho.
- Idaho County—borders Clearwater, Lemhi, Valley, Adams, Nez Perce and Lewis counties in Idaho; Missoula and Ravalli counties in Montana, and Wallowa County in Oregon.
- LaSalle County—borders Lee, DeKalb, Kendall, Grundy, Livingston, Woodford, Marshall, Putnam and Bureau counties in Illinois.
- Madison County—borders Bond, Clinton, Jersey, Macoupin, Montgomery and St. Clair counties in Illinois, St. Charles and St. Louis counties in Missouri, and the independent city of St. Louis, Missouri.
- Pike County—borders Adams, Brown, Scott, Morgan, Greene and Calhoun counties in Illinois, and Pike, Ralls and Marion counties in Missouri.
- Allen County—borders Noble, DeKalb, Adams, Wells, Huntington and Whitley counties in Indiana, and Defiance, Paulding and Van Wert counties in Ohio.
- Grant County—borders Huntington, Wells, Blackford, Delaware, Madison, Tipton, Howard, Miami and Wabash counties in Indiana.
- Hardin County—borders Jefferson County (Louisville) & Bullitt County (northeast), Nelson County (east) LaRue County (southeast) Hart County (south) Grayson County(southwest) Breckinridge County (west) Meade County (northwest) in Kentucky and Harrison County in Indiana(northern point)
- Caddo Parish—borders *Miller County, Arkansas; Lafayette County, Arkansas; Bossier Parish; Red River Parish; De Soto Parish; Panola County, Texas; Harrison County, Texas; Marion County, Texas; Cass County, Texas
- Iron County—borders Houghton, Baraga, Marquette, Ontonagon, Dickinson and Gogebic counties in Michigan, and Florence, Forest and Vilas counties in Wisconsin.
- Beltrami County—borders Lake of the Woods, Koochiching, Itasca, Cass, Hubbard, Clearwater, Pennington, Marshall, and Roseau counties in Minnesota.
- Renville County—borders Kandiyohi, Meeker, McLeod, Sibley, Nicollet, Brown, Redwood, Yellow Medicine, and Chippewa counties in Minnesota.
- Missoula County—borders Mineral, Sanders, Lake, Flathead, Powell, Granite and Ravalli counties in Montana, and Idaho and Clearwater counties in Idaho.
- Elko County—borders Humboldt, Lander, Eureka and White Pine counties in Nevada; Tooele and Box Elder counties in Utah; and Cassia, Twin Falls and Owyhee counties in Idaho.
- Nye County—borders Churchill County, Nevada, Lander, Eureka, White Pine, Lincoln, Clark, Esmeralda and Mineral counties in Nevada, and Inyo County in California.
- Grafton County—borders Coos, Carroll, Belknap, Merrimack and Sullivan counties in New Hampshire, and Essex, Windsor, Orange and Caledonia counties in Vermont.
- Lea County—borders Roosevelt, Chaves and Eddy counties in New Mexico, and Loving, Winkler, Andrews, Gaines, Yoakum and Cochran counties in Texas.
- Iredell County—borders Yadkin, Davie, Rowan, Cabarrus, Mecklenburg, Lincoln, Catawba, Alexander and Wilkes counties in North Carolina.
- Moore County—borders Chatham, Lee, Harnett, Cumberland, Hoke, Richmond, Montgomery, Randolph and Scotland counties in North Carolina.
- Burke County—borders Renville, Ward, Mountrail, Williams and Divide counties in North Dakota; and the rural municipalities of Estevan No. 5, Coalfields No. 4 and Enniskillen No. 3, and the Village of North Portal, in Saskatchewan, Canada.
- Wallowa County—borders Umatilla, Union, and Baker counties in Oregon; Adams, Idaho, and Nez Perce counties in Idaho; and Asotin, Garfield, and Columbia counties in Washington State.
- Lycoming County—borders Bradford, Tioga, Sullivan, Columbia, Montour, Northumberland, Union, Clinton and Potter counties in Pennsylvania. Lycoming is the largest county in Pennsylvania by area, while Montour is the smallest.
- Northumberland County—borders Lycoming, Montour, Columbia, Schuylkill, Dauphin, Perry, Juniata, Snyder and Union counties in Pennsylvania.
- Washington County—borders Beaver, Allegheny, Westmoreland, Fayette and Greene counties in Pennsylvania, and Marshall, Ohio, Brooke and Hancock counties in West Virginia.
- Orangeburg County—borders Calhoun, Clarendon, Dorchester, Berkeley, Bamberg, Colleton, Aiken, Barnwell and Lexington counties in South Carolina.
- Lyman County—borders Hughes, Hyde, Buffalo, Brule, Gregory, Tripp, Mellette, Jones and Stanley counties in South Dakota.
- Cumberland County—borders Fentress, Overton, Morgan, Roane, Rhea, Bledsoe, Van Buren, White and Putnam counties in Tennessee.
- Crockett County—borders Upton, Reagan, Irion, Schleicher, Sutton, Val Verde, Terrell, Pecos, and Crane counties in Texas.
- Hidalgo County—borders Brooks, Kenedy, Willacy, Cameron, and Starr counties in Texas; and the municipios of Ciudad Gustavo Díaz Ordaz, Matamoros, Reynosa, and Río Bravo in the estado of Tamaulipas across the Rio Grande in northern Mexico.
- Starr County—borders Jim Hogg, Brooks, Hidalgo, and Zapata counties in Texas; and the municipios of Camargo, Nueva Ciudad Guerrero, Ciudad Gustavo Díaz Ordaz, Ciudad Mier, and Ciudad Miguel Alemán in the estado of Tamaulipas.
- Uintah County—borders Grand, Emery, Carbon, Duchesne, Summit, Daggett counties in Utah, and Moffat, Rio Blanco and Garfield counties in Colorado.
- Albemarle County—borders Greene, Orange, Louisa, Fluvanna, Buckingham, Nelson, Augusta and Rockingham counties, and the independent city of Charlottesville, in Virginia.
- Augusta County—borders Rockingham, Albemarle, Nelson, Rockbridge, Bath and Highland counties, and the independent cities of Staunton and Waynesboro, in Virginia, and Pendleton County in West Virginia.
- Fairfax County—borders Loudoun, Prince William and Arlington counties, and the independent cities of Alexandria, Falls Church and Fairfax, in Virginia; and Prince George's, Montgomery and Charles counties in Maryland.
- Grayson County—borders Washington, Smyth, Wythe and Carroll counties, and the independent city of Galax, in Virginia; Ashe, Alleghany and Surry counties in North Carolina; and Johnson County in Tennessee.
- Rockbridge County—borders Bath, Augusta, Nelson, Amherst, Bedford, Botetourt and Alleghany counties, and the independent cities of Lexington and Buena Vista, in Virginia.
- Okanogan County—borders Ferry, Lincoln, Grant, Douglas, Chelan, Skagit and Whatcom counties in Washington, and Okanagan-Similkameen and Kootenay Boundary regional districts in British Columbia, Canada.
- Kanawha County—borders Roane, Clay, Nicholas, Fayette, Raleigh, Boone, Lincoln, Putnam and Jackson counties in West Virginia.
The following counties share boundaries with ten other counties or county equivalents. Those counties may lie in adjacent states, in Canada, or in Mexico.
- Pima County—borders Yuma, Maricopa, Pinal, Graham, Cochise and Santa Cruz counties in Arizona; and the municipios of Altar, Caborca, Plutarco Elías Calles and Sáric in the Mexican state of Sonora.
- Jefferson County--borders Boulder, Adams, Arapahoe, Douglas, Teller, Park, Clear Creek and Gilpin counties, and the combined city-counties of Broomfield and Denver, all in Colorado.
- Polk County—borders Lake, Orange, Osceola, Okeechobee, Highlands, Hardee, Manatee, Hillsborough, Sumter and Pasco counties in Florida.
- Fulton County—borders Cherokee, Forsyth, Gwinnett, DeKalb, Clayton, Fayette, Coweta, Carroll, Douglas and Cobb counties in Georgia. Several proposals have been made to recreate Milton County, which had been merged with Fulton County in 1932 as a money-saving measure during the Great Depression. If this were to happen, the smaller Fulton County would still border eight other counties: Milton, Fayette, DeKalb, Clayton, Coweta, Carroll, Douglas and Cobb.
- Somerset County—borders Aroostook, Penobscot, Piscataquis, Waldo, Kennebec and Franklin counties in Maine, and Le Granit, Beauce-Sartigan, Les Etchemins, and Montmagny regional county municipalities in Quebec.
- Worcester County—borders Middlesex, Norfolk, Hampden, Hampshire and Franklin counties in Massachusetts; Cheshire and Hillsborough counties in New Hampshire; Windham and Tolland counties in Connecticut, and Providence County in Rhode Island.
- Flathead County—borders Glacier, Pondera, Teton, Lewis and Clark, Powell, Missoula, Lake, Sanders and Lincoln counties in Montana, and Regional District of East Kootenay in British Columbia.
- Quay County—borders Union, Harding, San Miguel, Guadalupe, De Baca, Roosevelt and Curry counties in New Mexico, and Deaf Smith, Oldham and Hartley counties in Texas.
- Bottineau County—borders Rolette, Pierce, McHenry and Renville counties in North Dakota; the rural municipalities of Edward, Arthur, Brenda, Winchester and Morton in Manitoba, and the rural municipality of Argyle No. 1 in Saskatchewan.
- Oconee County—borders Pickens and Anderson counties in South Carolina; Jackson, Transylvania and Macon counties in North Carolina; and Hart, Franklin, Stephens, Habersham and Rabun counties in Georgia.
- Hamilton County—borders Bledsoe, Rhea, Meigs, Bradley, Marion and Sequatchie counties in Tennessee, and Whitfield, Catoosa, Walker and Dade counties in Georgia.
- Chesterfield County—borders Henrico, Charles City, Prince George, Dinwiddie, Amelia and Powhatan counties, and the independent cities of Richmond, Hopewell, Colonial Heights and Petersburg, in Virginia.
- Whitman County—borders Spokane, Asotin, Garfield, Columbia, Franklin, Adams and Lincoln counties in Washington, and Benewah, Latah and Nez Perce counties in Idaho.
The following counties share boundaries with eleven other counties. Those counties may lie in adjacent states or in Mexican estados.
- Emanuel County—borders Jefferson, Jenkins, Burke, Candler, Tattnall, Bulloch, Montgomery, Toombs, Laurens, Johnson and Treutlen counties in Georgia.
- Cherry County—borders Brown, Keya Paha, Blaine, Grant, Thomas, Hooker and Sheridan counties in Nebraska, and Shannon, Bennett, Todd and Tripp counties in South Dakota.
- Webb County—borders Dimmit, La Salle, Duval, Jim Hogg, Zapata and Maverick counties in Texas; the municipios of Guerrero and Hidalgo in the estado of Coahuila, Anáhuac in the estado of Nuevo León, and Nuevo Laredo and Guerrero in the estado of Tamaulipas in Mexico.
One county shares boundaries with twelve other counties or county equivalents.
- Aroostook County, Maine—borders Washington, Penobscot, Piscataquis and Somerset counties in Maine; Montmagny, L'Islet, Kamouraska and Témiscouata regional county municipalities in the Canadian province of Quebec; and Madawaska, Victoria, Carleton and York counties in the Canadian province of New Brunswick.
One county shares boundaries with thirteen other counties.
- Washoe County, Nevada—borders Humboldt, Pershing, Churchill, Lyon and Storey counties, and the independent city of Carson City, in Nevada; Placer, Nevada, Sierra, Lassen and Modoc counties in California; and Lake and Harney counties in Oregon.
One county shares boundaries with fourteen other counties.
- San Juan County, Utah—borders Kane, Garfield, Wayne, Emery and Grand counties in Utah; Montrose, San Miguel, Dolores, Montezuma and Mesa counties in Colorado; Apache, Navajo and Coconino counties in Arizona, and San Juan County in New Mexico.
- A very few individual county articles do not include lists or diagrams of adjacent counties. In those cases a count was made based on available maps. Even where lists or diagrams have been included they may not be accurate or exhaustive. Some lists may omit boundaries that exist entirely in water or at only a single point.
- Mohave County and its adjacent counties form the largest such block of counties outside of Alaska. Their combined land area is 231,978.34 km² (89,567.34 sq mi), or larger than that of the state of Idaho. They include the #1 (San Bernardino), #2 (Coconino), #5 (Mohave), and #7 (Lincoln) largest counties outside of Alaska.
- Bordering counties include one or more Mexican municipios.
- One or more borders lies entirely in water.
- Includes at least one boundary of "zero" length.
- Adjoining counties include county equivalents in Canada.
- Adjacent municipalities include at least one independent city.
- boundary of "zero" length
- This independent city is enclaved within the county.
- In 1969 Ormsby County was officially dissolved and Carson City took over all municipal services with an independent city status.