Curwensville is a borough in Clearfield County, Pennsylvania, United States, 45 miles north of Altoona on the West Branch Susquehanna River. Coal mining, tanning, and the manufacture of fire bricks were the industries at the turn of the 20th century. In 1900, 1,937 people lived in the borough, and in 1910, 2,549 lived there. As of the 2020 U.S. census, the borough had a population of 2,567. The population of the borough at its highest was 3,422 in 1940.