Templeton is a census-designated place in San Luis Obispo County, California, United States. The population was 7,674 at the 2010 census, up from 4,687 at the 2000 census. Templeton is located at 35°33′14″N 120°42′34″W / 35.55389°N 120.70944°W. It is approximately five miles south of Paso Robles and five miles north of Atascadero along U.S. 1…Templeton is a census-designated place in San Luis Obispo County, California, United States. The population was 7,674 at the 2010 census, up from 4,687 at the 2000 census. Templeton is located at 35°33′14″N 120°42′34″W / 35.55389°N 120.70944°W. It is approximately five miles south of Paso Robles and five miles north of Atascadero along U.S. 101. State Route 46 intersects U.S. 101 on the north edge of the town.