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.

Fremont County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 48,939. The county seat is Cañon City. The county is named for 19th-century explorer and presidential candidate John C. Frémont.