San Luis Obispo County, California

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San Luis Obispo County ( san-lu-is-o-bis-po), officially the County of San Luis Obispo, is a county on the Central Coast of California. Its population was 282,424 at the 2020 census, and the U.S. Census Bureau estimated 282,367 residents on July 1, 2025. San Luis Obispo is the county seat and its largest city by population. The county has 3,301 square miles (8,550 km2) of land, extending from the Pacific coast across the Santa Lucia Range to inland valleys and the Caliente Range. The county was established in 1850. Its history includes Chumash and Salinan communities, Spanish missions, Mexican ranchos, and the development of agriculture, railroads, and coastal shipping. Cal Poly opened in 1903, and military training installations expanded during World War II. Service industries account for most employment, including government, education and health care, and leisure and hospitality. Agriculture includes strawberries and wine grapes, the county’s two highest-value crops in 2024. The county...

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