Athens is a city in Limestone County, Alabama. As of the 2000 census, the population of the city is 18,967. According to the 2005 U.S. Census estimates, the city had a population of 20,972. The city is the county seat of Limestone County, and is included in the Huntsville-Decatur Combined Statistical Area. Athens apartments for rent comparison page shows most up to date rent information on Athens apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.