About Thornton CDP, California
Thornton CDP, California is a census-designated place (CDP) in Contra Costa County, California, United States. The population was 3,359 at the 2010 census.
Thornton CDP is located at 37°51′15″N 121°37′17″W / 37.85417°N 121.62139°W / 37.85417; -121.62139 (37.854159, -121.621306).
According to the United States Census Bureau, the CDP has a total area of 2.0 square miles (5.2 km²), all of it land.