Williamston is a city in Ingham County in the U.S. state of Michigan. The city is at the southeast corner of Williamstown Township, but is politically independent. A portion of Williamston was annexed from adjacent Wheatfield Township. Downtown Williamston is located at the intersection of Grand River Avenue (M-43) and Putnam Street (Williamston Road). The population was 3,854 at the 2010 census. Williamston is most notable for its antiques markets, and it has been promoted as a quaint, small town just outside the larger city of Lansing. It recently renovated McCormick Park, which borders the Red Cedar River in downtown Williamston.