Sacramento County encompasses approximately 994-square miles in the middle of the 400-mile long Central Valley, which is California's prime agricultural region. The County is bordered by Contra Costa and San Joaquin Counties on the south, Amador and El Dorado Counties on the east, Placer and Sutter Counties on the north, and Yolo and Solano Counties on the west.

Sacramento County extends from the low delta lands between the Sacramento and San Joaquin rivers north to about ten miles beyond the State Capitol and east to the foothills of the Sierra Nevada Mountains. The southernmost portion of Sacramento County has direct access to the San Francisco Bay.

The California Department of Finance has released their January 1, 2023 Estimates.

• View full Demographics information 
• Read the Press Re​l​ease​​
  

The CA DoF is estimating a drop in population for Sacramento County since the 2020 Census, from 1,585,055 down to 1,572,453.

The cities of Elk Grove, Folsom, Rancho Cordova and Galt are all estimated to have gained population.

But the cities of Sacramento, Citrus Heights, Isleton, and the unincorporated area have all decreased in population. See table below for specifics.

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Included in Sacramento County are seven incorporated cities. Varying from quaint to cosmopolitan, each of these cities contributes a rich and unique dimension to the whole of Sacramento County and its communities. Our growing economy and educated workforce are part of one of the most livable and diverse regions in America and is the core cultural and economic center in the region. The 2010 U.S. Census Bureau estimated Sacramento County’s total population as more than 1.4 million. With more than a half million residents living in unincorporated Sacramento County, it makes our unincorporated county population the fifth largest in the state. Read more on California's Total State Population​​.