Pleasant Hills is a census-designated place (CDP) in Harford County, Maryland, United States.

There is no post office with the designation "Pleasant Hills"; most of the residents have either Fallston or Kingsville addresses and consider themselves as belonging to those communities [citation needed].

Maryland Route 147 (Harford Road) forms the northwestern edge of the CDP.

U.S. Route 1 (Bel Air Road) runs through the community, leading northeast 4 miles (6 km) to Bel Air, the Harford County seat, and southwest 18 miles (29 km) to Baltimore.

14.0% of all households were made up of individuals, and 7.8% had someone living alone who was 65 years of age or older.