Albertson is located south of Roslyn and east of Searingtown. The boundary between Albertson & Searingtown is ill-defined, as they share the same post office and are unincorporated. In general, Searingtown refers to the area west of Searingtown Road and Albertson the area east of Willis Avenue. Searingtown School and the Searing-Roslyn United Methodist Church both use Albertson as their address.
According to the United States Census Bureau, the CDP has a total area of 0.7 square miles (1.7 km²), all land.