Mercer can refer to several places in the United States:

• Mercer University is located primarily in Macon, Georgia, with additional campuses in Atlanta, Savannah, Columbus, and regional centers in Douglas and Henry counties

• Mercer, Pennsylvania is a borough and the county seat of Mercer County, Pennsylvania. It has a population of about 1,982 as of 2020 and is part of the Hermitage micropolitan area

• Mercer, Maine is a town in Somerset County, Maine, with a population of 709 as of 2020. It lies in central Maine, northeast of Augusta and west of Waterville

• Mercer, North Dakota is a small city in McLean County, with a population of 88 in 2020. It was founded in 1905 and named after William Henry Harrison Mercer

• Mercer, Ohio is an unincorporated community in Mercer County, Ohio. It was originally named Milan but renamed Mercer in 1837 after Revolutionary War hero Hugh Mercer

So depending on context, Mercer could refer to a university in Georgia or towns/boroughs in Pennsylvania, Maine, North Dakota, or Ohio.