Avalon is a borough in Allegheny County, Pennsylvania, United States along the Ohio River, 6 miles (9.7 km) downstream from Pittsburgh. It is a largely residential borough with a few small stores. The population was 5,294 at the 2000 census. The borough is located in the Northgate School District. Avalon is located at 40°30′4″N 80°4′7″W / 40.50111°N 80.06861°W / 40.50111; -80.06861.