Athens is a borough in Bradford County, Pennsylvania, United States, located 2 miles 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 3,367 at the 2010 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.In September 2011, Athens was heavily damaged by river flooding from Tropical Storm Lee. Much of Athens was under water, with the most damage in the downtown area along the river. Damage in nearby Tioga County, New York, was estimated at $100 million.