Carrolltown is a borough within East Carroll Township in Cambria County, Pennsylvania, United States. The population was 1,049 at the 2000 census. It is part of the Johnstown, Pennsylvania Metropolitan Statistical Area.
It is located at 40°36′10″N 78°42′33″W / 40.60278°N 78.70917°W / 40.60278; -78.70917 (40.6029, -78.7091), about 20 miles west of Altoona, Pennsylvania. According to the United States Census Bureau, the borough has a total area of 0.7 square miles (1.7 km²), all of it land.
As of the census of 2000, there were 1,049 people, 407 households, and 295 families residing in the borough. The population density was 1,583.8 people per square mile (613.7/km²). There were 440 housing units at an average density of 664.3 per square mile (257.4/km²). The racial makeup of the borough was 99.62% White, 0.19% African American, and 0.19% from two or more races.