Adamsville is a census-designated place in Crawford County, Pennsylvania, United States. The population was 67 at the 2010 census, down from 117 in 2000. Adamsville is located in southwestern Crawford County at 41°30′38″N 80°22′11″W / 41.51056°N 80.36972°W, in southern West Fallowfield Township. Pennsylvania Route 18 passes through t…Adamsville is a census-designated place in Crawford County, Pennsylvania, United States. The population was 67 at the 2010 census, down from 117 in 2000. Adamsville is located in southwestern Crawford County at 41°30′38″N 80°22′11″W / 41.51056°N 80.36972°W, in southern West Fallowfield Township. Pennsylvania Route 18 passes through the community, leading north 3 miles to Hartstown and south 8 miles to Greenville.