Athens is a borough in Bradford County, Pennsylvania, United States, located 2 miles (3 km) south of the New York state line on the Susquehanna and Chemung rivers. The population was 3,749 in 1900 and 3,796 in 1910. The population was 3,265 at the 2020 census. Athens is in a small area locally known as "The Valley", a group of four contiguous communities in Pennsylvania and New York: Waverly, New York; South Waverly, Pennsylvania; Sayre, Pennsylvania; and Athens. The Valley has a population near 30,000.