Americus is a city in Sumter County, Georgia, United States. As of the 2010 census, the city had a population of 17,041. Americus is the home of Habitat for Humanity's international headquarters, the famous Windsor Hotel, The Fuller Center for Housing international headquarters, The Rosalynn Carter Institute for Caregiving, Glover Foods and many more well-known organizations.The city is the county seat of Sumter County. Americus is the principal city of the Americus Micropolitan Statistical Area, a micropolitan area that covers Schley and Sumter counties and had a combined population of 36,966 at the 2000 census.