San Diego County lies just north of the Mexican border, is the county seat of San Diego County and is the second largest city in California. It is famous for its beaches. The city's economy is largely based on agriculture, biotechnology, financial and business services, software development etc. The average home value is $431,000; rent is $1,399 and average income is $50,904. Barney & Barney are the largest insurance sector employers in San Diego.