There are 40 US Post Offices in Sacramento County serving a total of 1,100,875 residents equating to 27,522 residents per post office. It's estimated that approximately 1,757,119 packages are handled across the 40 county post offices annually. Sacramento County is a county in the U.S. state of California. As of the 2010 census, the population was 1,418,788. Its county seat is Sacramento, which has been the state capital of California since 1854. Sacramento County is included in the Sacramento-Roseville-Arden-Arcade, CA Metropolitan Statistical Area. The county covers about 994 square miles (2,570 km2) in the northern portion of the Central Valley, on into Gold Country. Sacramento County extends from the low delta lands between the Sacramento River and San Joaquin River north to about ten miles (16 km) beyond the State Capitol and east into the foothills of the Sierra Nevada Mountains. The southernmost portion of Sacramento County has direct access to San Francisco Bay."