Williamsburg is a statutory town located in Fremont County, Colorado, United States. The town population was 731 at the 2020 census. The Florence post office serves Williamsburg. Williamsburg is located in southeastern Fremont County at 38°23′1″N 105°9′37″W / 38.38361°N 105.16028°W. It is bordered to the east by the city of Florence and t…Williamsburg is a statutory town located in Fremont County, Colorado, United States. The town population was 731 at the 2020 census. The Florence post office serves Williamsburg. Williamsburg is located in southeastern Fremont County at 38°23′1″N 105°9′37″W / 38.38361°N 105.16028°W. It is bordered to the east by the city of Florence and to the south by the town of Rockvale. Cañon City, the county seat, is 8 miles to the northwest.