The following are California State Militia units that were active in the state of California between 1851 and 1861, prior to the American Civil War.
Volunteer Companies of the California State Militia 1850-1860
Amador County
Amador Rangers, Jackson, 1858 Utah War
Volcano Guard, Volcano, 1858 Utah War
Butte County
Oroville Guard, Oroville, December 22, 1856 - July 5, 1857
Calaveras County
First Calaveras Guard, Mokelumne Hill, 1852 - 1853
Jesus Maria Guard, Jesus Maria, 1854-1857
El Dorado County
1st Company, Mud Springs 1850 El Dorado Expedition
2nd Company, Placerville 1850, El Dorado Expedition
3rd Company, Placerville 1850 El Dorado Expedition
Placerville Guard, Placerville, 1855
Coloma Greys, Coloma, 1857
Confidence Guard, Placerville, 1860
Humboldt County
Union Volunteers, Union, 1855 Klamath War
Trinity Rangers, Pardee's Ranch, Redwood Creek, 1858 Wintoon War/Bald Hills War Humboldt Volunteers, Hydesville, 1860 Bald Hills War
Klamath County
Klamath Mounted Rangers, Crescent City, 1854-1856 Klamath War
Coast Rangers, Crescent City, 1854-1855 Klamath War
Klamath Rifles, Young's Ferry, 1855 Klamath War
Mounted Coast Rifles, Crescent City, 1855 Klamath War
Salmon Guard, Sawyers Bar, 1855-1856 Klamath War
Citizens of Crescent City, Crescent City, 1856
Del Norte County (from 1857) Crescent Rifles, Crescent City, 1856-1861
Los Angeles County
Los Angeles Guard, Los Angeles, 1853 - 1881 Operated against gangs of robbers or raiding bands of Indians. Los Angeles Rangers, Los Angeles, 1853 - 1857 Sheriff's auxiliaries vs organized bands of outlaws Monte Rangers, Los Angeles, 1854 - 1859 Operated against gangs of robbers or raiding bands of Indians. Ringgold Light Artillery, Los Angeles, 1855 - 1857 City Guard, Los Angeles, 1855 - 1861 "suppressing lawlessness" Lanceros de Los Angeles, Los Angeles, 1857 - 1861 "for the preservation of order, the chastisement of criminals and the repression of outrages" Union Guard, Los Angeles, 1857 - 1859 Southern Rifles, Los Angeles, 1857 - 1862
Mariposa County
Mariposa Battalion, Agua Fria, 1851 Mariposa War
California State Rangers, Quartzburg, 1853 Hunt for Joaquin Murrieta
Mariposa Guard, Mariposa, 1856
Mariposa Mounted Riflemen, Mariposa, 1858-1861? Utah War
Nevada County
Nevada Rifles, Nevada City, 1858-1863 Utah War, Paiute War
Placer County
Mountain Blues, Iowa Hill, 1855 - 1856
Placer Rifles, Auburn, 1856 - 1857
Plumas County
Plumas Rangers, Quincy, 1855
Sacramento County
Sutter Rifles, Sacramento, 1852
Sacramento Guard, Sacramento, 1855 - 1856
Independent City Guard or City Guard, Sacramento, 1856 - 1880 Paiute War
Sacramento Cadets, Sacramento, 1856-1857
San Bernardino County
San Bernardino Rough and Ready Cavalry, San Bernardino, 1855-1857 Operated against gangs of robbers or raiding bands of Indians. First Light Dragoons, San Bernardino, 1856-1857 Operated against gangs of robbers or raiding bands of Indians. San Bernardino Rangers, San Bernardino, 1856-1862 Operated against gangs of robbers or raiding bands of Indians.
San Diego County
Fitzgerald Volunteers, San Diego, 1851 - 1852 Garra Revolt
San Diego Guard, San Diego, 1856 - 1863 Operated against gangs of robbers or raiding bands of Indians.