Millheim is a borough in Centre County, Pennsylvania, United States.

It is part of the State College, Pennsylvania Metropolitan Statistical Area.

[3] According to the United States Census Bureau, the borough has a total area of 1.3 square miles (3.4 km2), all land.

There were 417 housing units at an average density of 315.9 per square mile (122.0/km2).

28.4% of all households were made up of individuals, and 14.0% had someone living alone who was 65 years of age or older.