San Diego County
San Diego County is a large county in the southwest area of California. The county borders Mexico. The population of San Diego County was about 3,095,313 in 2010, which makes San Diego County the second most populated county in California
San Diego County has about 70 miles (110 km) of coastline.
Also in this county are 16 military locations of the United States Navy, U.S. Marine Corps and the U.S. Coast Guard, including Naval Base San Diego, Marine Corps Base Camp Pendleton, Marine Corps Air Station Miramar, and Naval Air Station North Island.