Rancho Cucamonga is a suburban city located in the U.S. state of California. It lies at the foothills of the San Gabriel Mountains in San Bernardino County. It coordinates at 34°7′24″N 117°34′46″W. The city was incorporated on November 30, 1977. The elevation is 1,207 feet above sea level. As of the 2010 census data, it had a total population of 165,269. The population density was 4,414.90/sq mi. It has Zip codes 91701, 91729, 91730, 91737, and 91739.