Cotton Town, Pennsylvania

Clappertown is an unincorporated community and census-designated place (CDP) in Blair County, Pennsylvania, United States. It was first listed as a CDP prior to the 2020 census.

The CDP is in southern Blair County, in the southeastern part of Greenfield Township. It is in the valley of Smoky Run, at the intersection of Cottontown/Lower Claar Road with Pine Hollow/Schellsburg Road. It is 2 mi southwest of Claysburg via Pine Hollow Road. Altoona is 20 mi to the north. Smoky Run is a southeastward-flowing tributary of Beaverdam Creek, one of the headwaters of the Frankstown Branch of the Juniata River, part of the Susquehanna River watershed.