Foresthill 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 1,483 at the 2010 census, down from 1,791 at the 2000 census. NOTE: The population of the CDP does not accurately reflect the Population of the Foresthill Divide in which some 6,000 people reside. The major subdivision of Todds Valley is not included in the numbers recorded under the CDP designation. This subdivision lies within the service area of the Foresthill Fire Protection District, the Foresthill Public Utility District, the Foresthill School District(s) and within the 95631 postal zip code area. As well, the residents/population of other outlying areas of the Foresthill community are not represented.