Coulterville (formerly, Maxwell's Creek) is a census-designated place 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 had a population of 201 at the 2010 census. 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.