Williamsville Map
Williamsville is a village in Sangamon County, Illinois, United States. The population was 1,439 at the 2000 census, and 1,387 at a 2009 estimate. It is part of the Springfield, Illinois Metropolitan Statistical Area.
Williamsville is located at 39°57?3?N 89°33?3?W / 39.95083°N 89.55083°W / 39.95083; -89.55083 (39.950942, -89.550745).
According to the United States Census Bureau, the village has a total area of 1.2 square miles (3.2 km²), all of it land.
Nearby cities include Buffalo, Middletown, Springfield, Mechanicsburg, Greenview.