Square Mileage by County

San Bernardino County

20,164

Inyo County

10,097

Kern County

8,170

Riverside County

7,243

Siskiyou County

6,318

Fresno County

5,998

Tulare County

4,844

Lassen County

4,690

Imperial County

4,598

Modoc County

4,340

San Diego County

4,281

Los Angeles County

4,079

Shasta County

3,850

Humboldt County

3,600

Mendocino County

3,510

San Luis Obispo County

3,326

Monterey County

3,324

Trinity County

3,223

Mono County

3,103

Tehama County

2,976

Santa Barbara County

2,745

Plumas County

2,618

Tuolumne County

2,293

Madera County

2,147

Merced County

2,008

Ventura County

1,864

El Dorado County

1,805

Butte County

1,665

Sonoma County

1,598

Stanislaus County

1,521

Placer County

1,507

Mariposa County

1,461

Kings County

1,436

San Joaquin County

1,436

San Benito County

1,397

Lake County

1,327

Glenn County

1,319

Santa Clara County

1,316

Colusa County

1,156

Calaveras County

1,036

Yolo County

1,034

Sacramento County

1,015

Del Norte County

1,003

Nevada County

992

Sierra County

959

Solano County

872

Alameda County

825

Contra Costa County

798

Napa County

797

Orange County

785

Alpine County

727

Yuba County

639

Sutter County

607

Amador County

601

Marin County

588

San Mateo County

531

Santa Cruz County

440

San Francisco County

91