Buffalo is a village in Mechanicsburg Township in Sangamon County, Illinois, United States.

It is part of the Springfield, Illinois Metropolitan Statistical Area.

[2] According to the 2010 census, Buffalo has a total area of 0.37 square miles (0.96 km2), all land.

There were 208 housing units at an average density of 564.4 per square mile (217.9/km2).

29.1% of all households were made up of individuals, and 17.1% had someone living alone who was 65 years of age or older.