Sumter County is a county located in the central portion of the U.S. state of Florida. As of the 2020 census, the population is 129,752. It has the oldest median age of any US county and the highest percentage of residents aged 65 and older—at 55.6% in 2014–2018. Its county seat is Bushnell, and the largest city is Wildwood. Although the community of The Villages has more residents, it is a part of unincorporated Sumter County.