Clappertown is an unincorporated community and census-designated place (CDP) in Blair County, Pennsylvania, United States.

[3] The CDP is in eastern Blair County, in the northwestern part of Huston Township.

It is in the Morrisons Cove region of the county, in the valley of Piney Creek, which flows north to the Frankstown Branch of the Juniata River at Ganister, part of the Susquehanna River watershed.

Lock Mountain rises to an elevation of 2,007 feet (612 m) just west of Clappertown.

This Blair County, Pennsylvania state location article is a stub.