Americus is a city in Sumter County, Georgia, United States. The population was 17,013 at the 2000 census. Americus is the home of Habitat for Humanity International's international headquarters, the famous Windsor Hotel (from 1892), 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.