List of U.S. counties bordering eight or more counties

Of the 3,143 counties and county equivalents in the United States, only around 250 border more than seven other 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 primarily to be a coincidence of . 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.
Eight counties
The following counties share boundaries with eight other counties or county equivalents. Those counties may lie in adjacent states, in Canada, or in Mexico.
Alabama
*Barbour County
*Cleburne County
*Lauderdale County
Arizona
*Mohave County
*Yuma County
Arkansas
*Mississippi County
*Union County
California
*Fresno County
*Inyo County
*Placer County
*Sacramento County
*San Bernardino County
*Siskiyou County
Colorado
*Grand County
*Gunnison County
*Las Animas County
*Logan County
*Pueblo County
*Weld County
Delaware
*Kent County
Florida
*Columbia County
*Glades County
*Hendry County
*Polk County
Georgia
*Burke County
*Carroll County
*Coffee County
*Elbert County
*Gordon County
*Gwinnett County
*Jefferson County
*Laurens County
*Spalding County
*Sumter County
*Walker County
*Ware County
Idaho
*Cassia County
*Fremont County
Illinois
*DeKalb County
*McLean County
*Saline County
*Sangamon County
*Shelby County
*Vermillion County
Indiana
* Dubois County
* Franklin County
* Greene County
* Jasper County
* Knox County
* Washington County
Iowa
*Butler County
*Clayton County
*Fayette County
*Pottawattamie County
Kansas
*Butler County
*Finney County
*Gove County
*Ness County
*Washington County
Kentucky
*Jefferson County
Louisiana
*Bienville Parish
*Natchitoches Parish
*Tensas Parish
Maryland
*Allegany County
*Anne Arundel County
*Charles County
*
*Washington County
Massachusetts
*Berkshire County
Michigan
*Allegan County
*Polk County
Mississippi
*Tunica County
Missouri
*Texas County
Montana
*Chouteau County
*Fallon County
*Fergus County
*Gallatin County
*Meagher County
*Rosebud County
*Valley County
*Dinwiddie 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.
California
*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.
Colorado
*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.
Florida
*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.
Georgia
*Hall County—borders White, Habersham, Banks, Jackson, Barrow, Gwinnett, Forsyth, Dawson and Lumpkin counties in Georgia.
Idaho
*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.
Illinois
*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.
Indiana
*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.
Kentucky
*Hardin County—borders & 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)
Louisiana
*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
Michigan
*Iron County—borders Houghton, Baraga, Marquette, Ontonagon, Dickinson and Gogebic counties in Michigan, and Florence, Forest and Vilas counties in Wisconsin.
Minnesota
*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.
Montana
*Missoula County—borders Mineral, Sanders, Lake, Flathead, Powell, Granite and Ravalli counties in Montana, and Idaho and Clearwater counties in Idaho.
Nevada
*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.
New Hampshire
*Grafton County—borders Coos, Carroll, Belknap, Merrimack and Sullivan counties in New Hampshire, and Essex, Windsor, Orange and Caledonia counties in Vermont.
New Mexico
*Lea County—borders Roosevelt, Chaves and Eddy counties in New Mexico, and Loving, Winkler, Andrews, Gaines, Yoakum and Cochran counties in Texas.
North Carolina
*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.
North Dakota
*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.
Oregon
*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.
Pennsylvania
*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.
South Carolina
*Orangeburg County—borders Calhoun, Clarendon, Dorchester, Berkeley, Bamberg, Colleton, Aiken, Barnwell and Lexington counties in South Carolina.
South Dakota
*Lyman County—borders Hughes, Hyde, Buffalo, Brule, Gregory, Tripp, Mellette, Jones and Stanley counties in South Dakota.
Texas
*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.
Utah
*Uintah County—borders Grand, Emery, Carbon, Duchesne, Summit, Daggett counties in Utah, and Moffat, Rio Blanco and Garfield counties in Colorado.
Virginia
*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 in Nevada; Placer, Nevada, Sierra, Lassen and Modoc counties in California; and Lake and Harney counties in Oregon.
Fourteen counties
One county shares boundaries with fourteen other counties.
*San Juan County, Utah—borders Kane, Garfield, Wayne, Emery<ref namezero/> and Grand counties in Utah; Montrose, San Miguel, Dolores, Montezuma and Mesa<ref namezero/> counties in Colorado; Apache, Navajo and Coconino counties in Arizona, and San Juan County<ref name=zero/> in New Mexico.

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