High Quality Content by WIKIPEDIA articles! 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), Fuller Center for Housing international headquarters, The Rosalynn Carter Institute for Caregiving , Glover Foods and many more well-known organizations.