Warren is a town in Knox County, Maine, United States. The population was 4,865 at the 2020 census. It includes the villages of East Warren, Warren and South Warren, the latter home to the Maine State Prison and minimum security Bolduc Correctional Facility.

Knox County is a county located in the state of Maine, United States. As of the 2020 census, the population was 40,607. Its county seat is Rockland. The county is named for Revolutionary War general and Secretary of War Henry Knox, who lived in the county from 1795 until his death in 1806. The county was established on April 1, 1860, and is the most recent county to be created in Maine. It was carved from parts of Waldo and Lincoln counties. The Union Fair, started in 1868, began as the efforts of the North Knox Agricultural and Horticultural Society.