North Catasauqua is a borough in Northampton County, Pennsylvania, United States. The borough was founded in 1907. The population of North Catasauqua was 2,971 at the 2020 census. The borough is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th-most populous metropolitan area in the U.S. as of the 2020 census.