Crescent City is the only incorporated city in Del Norte County, California; it is also the county seat. Named for the crescent-shaped stretch of s…Crescent City is the only incorporated city in Del Norte County, California; it is also the county seat. Named for the crescent-shaped stretch of sandy beach south of the city, Crescent City had a total population of 6,673 in the 2020 census, down from 7,643 in the 2010 census.