Shasta County, officially the County of Shasta, is a county located in the northern portion of the U.S. state of California. Its population is 182,155 as of the 2020 census, up from 177,223 from the 2010 census. 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.