Namesakes
- Fort Mercer, located in Red Bank Battlefield of what is now the Borough of National Park, New Jersey, which was named in his honor.
- Mercer County, New Jersey where Trenton is located, was named after Hugh Mercer.
- Mercer County, Pennsylvania
- Mercer County, Ohio
- Mercer County, Kentucky
- Mercer County, Illinois
- Mercer County, West Virginia
- Mercer County, Missouri
- The town of Mercer, Maine
- The town of Mercerville, New Jersey
- The Mercer Oak
- Mercer, Pennsylvania
- Mercersburg, Pennsylvania
- Mercer Street in Fredericksburg, VA is named in Hugh Mercer's honor.
- Hugh Mercer Elementary School in Fredericksburg, Virginia.
- Mercer Hall at the University of Mary Washington
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