Big River is a census-designated place located in the U.S. state of California. It is within San Bernardino County. It has a total area of 11.35 square miles at 34°8′2″N 114°22′11″W. The elevation is 436 feet above sea level. As of the 2010 census data, it had a total population of 1,707. It has Zip code 92242.