Coulterville (formerly, Maxwell's Creek) is an unincorporated community in Mariposa County, California. It is located on Maxwell Creek 20 miles (32 km) northwest of Mariposa, at an elevation of 1699 feet (518 m). Coulterville has a population of 1,772. It is a mining town located in the foothills of the Sierra Nevada. The ZIP Code is 95311. The community is inside area code 209.