List of the largest counties in the United States by area
Rank County State County Seat Total Area Land Area
1 San Bernardino County California San Bernardino 20,105.32 sq mi ( 52,072.5 km ) 20,052.5 sq mi ( 51,936 km )
2 Coconino County Arizona Flagstaff 18,661.21 sq mi ( 48,332.3 km ) 18,617.42 sq mi ( 48,218.9 km )
3 Nye County Nevada Tonopah 18,158.73 sq mi ( 47,030.9 km ) 18,146.66 sq mi ( 46,999.6 km )
4 Elko County Nevada Elko 17,202.94 sq mi ( 44,555.4 km ) 17,179.03 sq mi ( 44,493.5 km )
5 Mohave County Arizona Kingman 13,469.71 sq mi ( 34,886.4 km ) 13,311.64 sq mi ( 34,477.0 km )
6 Apache County Arizona St. Johns 11,218.42 sq mi ( 29,055.6 km ) 11,204.88 sq mi ( 29,020.5 km )
7 Lincoln County Nevada Pioche 10,636.77 sq mi ( 27,549.1 km ) 10,633.61 sq mi ( 27,540.9 km )
8 Sweetwater County Wyoming Green River 10,491.17 sq mi ( 27,172.0 km ) 10,425.3 sq mi ( 27,001 km )
9 Inyo County California Independence 10,226.98 sq mi ( 26,487.8 km ) 10,203.1 sq mi ( 26,426 km )
10 Harney County Oregon Burns 10,226.49 sq mi ( 26,486.5 km ) 10,134.33 sq mi ( 26,247.8 km )
11 Navajo County Arizona Holbrook 9,959.49 sq mi ( 25,795.0 km ) 9,953.18 sq mi ( 25,778.6 km )
12 Malheur County Oregon Vale 9,929.99 sq mi ( 25,718.6 km ) 9,887.09 sq mi ( 25,607.4 km )
13 Humboldt County Nevada Winnemucca 9,657.87 sq mi ( 25,013.8 km ) 9,647.91 sq mi ( 24,988.0 km )
14 Fremont County Wyoming Lander 9,265.8 sq mi ( 23,998 km ) 9,182.27 sq mi ( 23,782.0 km )
15 Maricopa County Arizona Phoenix 9,224.27 sq mi ( 23,890.7 km ) 9,203.14 sq mi ( 23,836.0 km )
16 Pima County Arizona Tucson 9,188.83 sq mi ( 23,799.0 km ) 9,186.27 sq mi ( 23,792.3 km )
17 White Pine County Nevada Ely 8,896.6 sq mi ( 23,042 km ) 8,875.98 sq mi ( 22,988.7 km )
18 Idaho County Idaho Grangeville 8,502.48 sq mi ( 22,021.3 km ) 8,484.88 sq mi ( 21,975.7 km )
19 Lake County Oregon Lakeview 8,358.47 sq mi ( 21,648.3 km ) 8,135.75 sq mi ( 21,071.5 km )
20 Kern County California Bakersfield 8,161.42 sq mi ( 21,138.0 km ) 8,140.96 sq mi ( 21,085.0 km )
List of largest counties
This is a list of the 100 largest counties in the United States by area. The list is based upon the total area of a county, both land and water surface, reported by the United States Census Bureau during the 2000 Census. Alaska is not divided into counties. A different ranking becomes apparent when comparing county areas by land area alone as opposed to total area. Some counties, such as Keweenaw and Alger Counties in Michigan, include significant amounts of water in their total area and would not appear on a list that considered land area alone. This list also includes the four counties that would be included when water area is not included.