Harrison City is a census-designated place (CDP) in Westmoreland County, Pennsylvania, United States.

[1] According to the United States Census Bureau, the CDP has a total area of 0.1 square miles (0.26 km2), all land.

The racial makeup of the CDP was 97.42% White, 1.94% African American, and 0.65% from two or more races.

44.0% of all households were made up of individuals, and 21.3% had someone living alone who was 65 years of age or older.

Harrison City is near the site of the Battle of Bushy Run.