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Castella is an unincorporated community and census-designated place (CDP) in the upper Sacramento Canyon of Shasta County, California, United States. It is located 46 miles north of Redding on Interstate 5 and is home to Castle Crags State Park. Its population is 214 as of the 2020 census. It has a Chevron gas station/store and a post office. The ZIP Code is 96017. The community is served by area code 530.