Walker Mill is an unincorporated area and census-designated place (CDP) in Prince George's County, Maryland, United States. Per the 2020 census, the population was 12,187.

Prince George's County Public Schools (PGCPS) is a public school district that serves Prince George's County, Maryland. During the 2023-2024 academic year, the district enrolls around 133,000 students and operates over 200 schools. PGCPS is the second-largest school district in Maryland, the third-largest district in the Washington-Baltimore metropolitan area, the 18th-largest in the United States, and the nation's largest school district with a majority-black student population.