California is a census-designated place and community in St. Mary's County, Maryland, United States. The population was 11,857 at the 2010 census, an increase of 27.4% from the 2000 census. California has been growing with the spread of population from the older adjacent community of Lexington Park and the growth in both technology-related and defense-related jobs at the Patuxent River Naval Air Station. There are department stores and numerous shopping centers situated along Maryland Highway 235 ("Three Notch Road"). Maryland Route 4 crosses Highway 235 in California, providing access to the wide Governor Thomas Johnson Bridge and the popular weekend resort town of Solomons on its opposite side. Bridge-bound traffic is notorious for backing up during rush hour.
The community was named after the state of California before 1897.
California is located at 38°18′20″N 76°29′40″W.
According to the United States Census Bureau, California has a total area of 14.8 square miles (38 km2), of which 12.8 square miles (33 km2) is land and 1.9 square miles (4.9 km2) (12.64%) is water.
As of the census of 2010, there were 11,857 people residing in California in 4,327 households. The population density was 928.1 people per square mile (358.3/km²).