Walker Mill is an unincorporated area and census-designated place (CDP) in Prince George's County, Maryland, United States.

[4] According to the United States Census Bureau, the CDP has a total area of 3.2 square miles (8.3 km2), all land.

Walker Mill is a part of the Prince George's County Public Schools system.

[9] Zoned elementary schools for the CDP are John Bayne, Doswell Brooks, Concord, and District Heights.

[12] Thomas Claggett Elementary School was previously in Walker Mill CDP.

[14] In May 2014 PGCPS applied for a grant from the state of Maryland that would permit it to close Claggett.