Granite Bay is a census-designated place (CDP) in Placer County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area. The population was 21,247 at the 2020 census, up from 20,402 at the 2010 census. The ZIP codes are 95746 and 95661. Granite Bay is a primarily residential suburb of Sacramento and is located just east of Roseville and west of Folsom Lake.

Placer County, officially the County of Placer, is a county located in the U.S. state of California. As of the 2020 census, the population was 404,739. The county seat is Auburn.