UK
- Lancaster, city of Lancashire
- City of Lancaster, district of Lancashire
United States of America
- Lancaster, city in Los Angeles County, California
- Lancaster, the county seat of Lancaster County, South Carolina
- Lancaster, city in Atchison County, Kansas
- Lancaster, county seat of Garrard County, Kentucky
- Lancaster, Worcester County Municipality, Massachusetts
- Lancaster, a city in Kittson County, Minnesota
- Lancaster, the county seat of Schuyler County, Missouri
- Lancaster, ancient name of the city of Lincoln, Nebraska
- Lancaster, capital municipality of Coos County, New Hampshire
- Lancaster, town in Erie County, New York
- Lancaster, the county seat of Fairfield County, Ohio
- Lancaster, Butler County Township, Pennsylvania
- Lancaster, the county seat of Lancaster County, Pennsylvania
- Lancaster, a township in Lancaster County, Pennsylvania
- Lancaster, city in Dallas County, Texas
- Lancaster, the county seat of Lancaster County, Virginia
- Lancaster, county seat of Grant County, Wisconsin