Highland Park is a census-designated place (CDP) in Mifflin County, Pennsylvania, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 0.7 square miles (1.8 km2), all of it land.

33.5% of all households were made up of individuals, and 20.0% had someone living alone who was sity-five years of age or older.

In the CDP, the population was spread out, with 18.5% under the age of eighteen, 4.6% from eighteen to twenty-four, 21.4% from twenty-five to forty-four, 25.9% from forty-five to sixty-four, and 29.5% who were sixty-five years of age or older.

Roughly 4.7% of families and 6.2% of the population were living below the poverty line, including 9.0% of those who were under the age of eighteen.