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The County provides a wide range of health, public safety and community services to residents of the region's 18 cities and a large unincorporated area. SanDiegoCounty.gov | SanDiegoCounty .gov
San Diego County (/ ˌ s æ n d i ˈ eɪ ɡ oʊ / ⓘ), officially the County of San Diego (Spanish: Condado de San Diego), is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the fifth-most populous in the United States.
The city is located immediately adjacent to the Mexico–United States border and is the seat of San Diego County, which has a population of nearly 3.3 million people as of 2021 [update]. 
In 2021, San Diego County, CA had a population of 3.3M people with a median age of 36.3 and a median household income of $88,240. Between 2020 and 2021 the population of San Diego County, CA declined from 3.32M to 3.3M, a −0.832% decrease and its median household income grew from $82,426 to $88,240, a 7.05% increase.
Within its borders of 4,200 sq. miles, San Diego County encompasses 18 incorporated cities and numerous other charming neighborhoods and communities, including downtown's historic Gaslamp Quarter, Little Italy, Coronado, La Jolla, Del Mar, Carlsbad, Escondido, La Mesa, Hillcrest, Barrio Logan and Chula Vista just to name a few.
County of San Diego public health information on COVID-19. Case data, testing sites, health order, guidance on reopening and gatherings.
California dreamers, endless coastline, and sunshine. As if all that sunshine weren’t enough, San Diego is a waterfront city with top-notch restaurants, beautiful ocean-sprayed vistas, neighborhoods that are steeped in history and culture, and a centrally located urban park.
District 1 – Nora Vargas. District 2 – Joel Anderson. District 3 – Terra Lawson-Remer. District 4 – Nathan Fletcher. District 5 – Jim Desmond. FORM OF GOVERNMENT: Charter. SAN DIEGO. County seat, San Diego. Created February 18, 1850.
The San Diego County Board of Supervisors is the legislative branch of the county government of San Diego County, California. Though officially nonpartisan, two Democrats and two Republicans currently comprise the Board of Supervisors, with one vacancy and the latest election occurring in 2020.
San Diego County, California. Population Estimates, July 1, 2022, (V2022) . 3,276,208. People. Population. Population Estimates, July 1, 2022, (V2022) . 3,276,208.