Twin Grove is an unincorporated community and census-designated place (CDP) in McLean County, Illinois, United States.

[3] Twin Grove is in western McLean County on both sides of Illinois Route 9.

[1] Kings Mill Creek flows southward through the western part of the community, leading to the Middle Fork of Sugar Creek, part of the Sangamon River watershed flowing west to the Illinois River.

The western portion is in the Olympia Community Unit School District 16.

The eastern portion is in the McLean County Unit School District 5.