Rank County Land Area
1 San Bernardino County, California 20,056.9
2 Inyo County, California 10,180.9
3 Kern County, California 8,131.9
4 Riverside County, California 7,206.5
5 Siskiyou County, California 6,277.9
6 Fresno County, California 5,958.0
7 Tulare County, California 4,824.2
8 Lassen County, California 4,541.2
9 San Diego County, California 4,206.6
10 Imperial County, California 4,176.6
11 Los Angeles County, California 4,057.9
12 Modoc County, California 3,917.8
13 Shasta County, California 3,775.4
14 Humboldt County, California 3,568.0
15 Mendocino County, California 3,506.3
16 San Luis Obispo County, California 3,298.6
17 Monterey County, California 3,280.6
18 Trinity County, California 3,179.2
19 Mono County, California 3,049.0
20 Tehama County, California 2,949.7
21 Santa Barbara County, California 2,735.1
22 Plumas County, California 2,553.0
23 Tuolumne County, California 2,220.9
24 Madera County, California 2,137.1
25 Merced County, California 1,935.0
26 Ventura County, California 1,843.1
27 El Dorado County, California 1,707.9
28 Butte County, California 1,636.5
29 Sonoma County, California 1,575.8
30 Stanislaus County, California 1,494.8
31 Mariposa County, California 1,448.8
32 Placer County, California 1,407.0
33 San Joaquin County, California 1,391.3
34 Kings County, California 1,389.4
35 San Benito County, California 1,388.7
36 Glenn County, California 1,314.0
37 Santa Clara County, California 1,290.1
38 Lake County, California 1,256.5
39 Colusa County, California 1,150.7
40 Calaveras County, California 1,020.0
41 Yolo County, California 1,014.7
42 Del Norte County, California 1,006.4
43 Sacramento County, California 964.6
44 Nevada County, California 957.8
45 Sierra County, California 953.2
46 Solano County, California 821.8
47 Orange County, California 790.6
48 Napa County, California 748.4
49 Alameda County, California 739.0
50 Alpine County, California 738.3
51 Contra Costa County, California 715.9
52 Yuba County, California 631.8
53 Sutter County, California 602.4
54 Amador County, California 594.6
55 Marin County, California 520.3
56 San Mateo County, California 448.4
57 Santa Cruz County, California 445.2
58 San Francisco County, California 46.9

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