San Diego County is located bordering the Pacific Ocean in the far southwest corner of California. The population in 2008 was estimated at 3,001,072 people, making it the third most populous county in California, just behind its northwestern neighbor Orange County. The county seat is the City of San Diego.
In addition, San Diego County is part of the San Diego – Tijuana metropolitan area, an area with over 5 million people and the largest bi-national metropolitan area shared between the United States and Mexico.
San Diego County lies just north of the Mexican border, sharing a border with Tijuana. It lies south of Orange County and west of Imperial County. It is home to miles of beaches, a mild Mediterranean to semi-arid climate, and 16 military facilities hosting the United States Navy, the United States Coast Guard and the United States Marine Corps.
As originally created in 1850 San Diego County was quite large and included most of southeastern California south and east of Los Angeles County. As such it included major parts of what are now Inyo, San Bernardino, Riverside, and Imperial counties.

County Website: www.sdcounty.ca.gov/

School District: http://www.sdcoe.net/