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 International's international headquarters, the famous Windsor Hotel (from 1892), The Fuller Center for Housing international headquarters, The Rosalynn Carter Institute for Caregiving http://www. rosalynncarter. org, Glover Foods and many more well-known organizations. The city is the county seat of Sumter County.