San Diego County is a county located in the U.S. state of California. As of the most recent data available, the county has a population of approximately 2,813,833 people, with a population density of about 669.16 persons per square mile.
The county spans a total land area of 4,205.00 square miles (10,891.00 square kilometers). The administrative center and county seat is San Diego, which often serves as a hub for local governance and services. The largest city within the county by population is San Diego.
Geographically, San Diego County experiences varied elevations, with its highest point at Julian 4,220 ft and its lowest point at Alpine 0 ft. The region operates in the UTC-8.