Frewsburg is a hamlet and census-designated place in the town of Carroll in Chautauqua County, New York, United States. The population was 1,906 at the 2010 census. The ZIP code is 14738 and the telephone exchange.Frewsburg is located on U.S. Route 62, which forms the main street in the village. While not an incorporated village, Frewsburg does have a population that is larger than many villages in the region and is a significant community in the area, dwarfed only by the city of Jamestown 5 miles to the northwest.