At its inception in 1911 District III, headquartered at Sacramento, encompassed approximately 680 miles covering the counties of: Alpine, Amador, Butte, Calaveras, Colusa, El Dorado, Glenn, Nevada, Placer, Plumas, Sacramento, San Joaquin, Sierra, Solano, Stanislaus, Sutter, Tuolumne, Yolo and Yuba. By 1924 District III covered 1,593.3 miles, and this expansion prompted a reorganization of territory. An east-west line passing through the city of Sacramento reduced the area of District III to 844.78 miles including the counties of: Butte, Colusa, El Dorado, Glenn, Nevada, Placer, southern Plumas, the northern portions of Sacramento and Yolo Counties, Sierra, Sutter and Yuba. The balance of the former District territory formed the new District X. By 1933 Plumas County was absorbed into District II, and district headquarters moved from Sacramento to Marysville.

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