San Diego County Area Information


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San Diego County

Located in the southwestern corner of California, San Diego is the most southwestern county in the 48 contiguous United States. Its largest city is San Diego. According to the 2010 U.S. Census, San Diego County had a population of 3,095,313 people, making it the second most populous county in California, the first being Los Angeles County. From north to south, San Diego County extends from the southern borders of San Clemente (Orange County) and Temecula (Riverside County) to the US-Mexico International Border and Tijuana. From east to west, San Diego County stretches from the Pacific Ocean to Imperial County.


San Diego County has a varied topography. On its western side is 70 miles of coastline. Most of San Diego between the coast and the Laguna Mountains consists of hills, mesas, and small canyons. Snow-capped (in winter) mountains rise to the northeast, with the Sonoran Desert to the far east. Cleveland National Forest is spread across the central portion of the county, while the Anza-Borrego Desert State Park occupies most of the northeast. Although the western third of the county is primarily urban, the mountains and deserts in the eastern two-thirds of the county consist primarily of undeveloped backcountry.


San Diego’s climate is characterized by warm, dry summers and mild winters with most of the annual precipitation falling between November and March. The city has mild, mostly dry weather, with an average of 201 days above 70 °F and low rainfall (only 9–13 inches annually). Summer temperatures are generally warm, with average highs of 70–78 °F and lows of 55–66 °F. Temperatures exceed 90 °F only four days a year. Winter temperatures are mild, with average high temperatures of 66–70 °F and lows of 50–56 °F.

San Diego Schools

Most of the city of San Diego is served by the San Diego Unified School District, and a collection of nearly 50 school districts serve the outer regions of the county. For more information on the demographics and performance of each school district, visit Education Data Partnership or the individual websites of some of the larger districts listed below. In terms of higher education, San Diego is home to three public state universities, two major private universities, and five community college systems.

San Diego Unified School District – Poway Unified School District – San Marcos Unified School District


The 2010 United States Census reported that San Diego County had a population of 3,095,313. The racial makeup of San Diego County was 1,981,442 (64.0%) White, 158,213 (5.1%) African American, 26,340 (0.9%) Native American, 336,091 (10.9%) Asian (4.7% Filipino, 1.6% Chinese, 1.4% Vietnamese, 0.8% Indian, 0.7% Korean, 0.6% Japanese, 0.2% Laotian, 0.2% Cambodian, 0.2% Thai, 0.5% Other Asian), 15,337 (0.5%) Pacific Islander, 419,465 (13.6%) from other races, and 158,425 (5.0%) from two or more races. Hispanic or Latino of any race were 991,348 persons (32.0%).

Information and data courtesy of and