There are 26 US Post Offices in Shasta County serving a total of 133,989 residents equating to 5,153 residents per post office. It's estimated that approximately 213,861 packages are handled across the 26 county post offices annually. Shasta County, officially the County of Shasta, is a county located in the northern portion of the U.S. state of California. As of the 2010 census, the population was 177,223. The county seat is Redding. Shasta County comprises the Redding, California Metropolitan Statistical Area. The county occupies the northern reaches of the Sacramento Valley, with portions extending into the southern reaches of the Cascade Range. Points of interest in Shasta County include Shasta Lake, Lassen Peak, and the Sundial Bridge."