Places beginning with WI in Illinois, United States
- Wichert
- Wideview
- Wilbern
- Wilberton
- Wilberton, Township of
- Wilbur Heights
- Wilcox, Township of
- Wilderman
- Wildrose
- Wildrose Valley (subdivision)
- Wildwood
- Wildwood Valley
- Wilkinson
- Willard
- Will County
- Willeford
- Willeys
- William Green Homes (subdivision)
- Williamsburg
- Williamsburg
- Williamsburg Green
- Williamsburg Hill
- Williamsburg (historical)
- Williamsburg (subdivision)
- Williamsfield
- Williamson
- Williamson County
- Williams Park
- Williams, Township of
- Williamsville
- Willisville
- Willisville Election Precinct
- Willow
- Willow Branch, Township of
- Willowbrook
- Willowbrook
- Willow Creek
- Willow Creek, Township of
- Willow Creek Trailer Park
- Willow Hill
- Willow Hill, Township of
- Willow Ridge
- Willow Springs
- Will, Township of
- Wilmette
- Wilmington
- Wilmington, Township of
- Wilsman
- Wilson
- Wilson
- Wilsonburg (historical)
- Wilson Heights
- Wilson, Township of
- Wilsonville
- Wilton
- Wilton Center
- Wilton, Township of
- Winchester
- Winchester-Hood Garden Homes (subdivision)
- Winchester Number 1 Election Precinct
- Winchester Number 2 Election Precinct
- Winchester Number 3 Election Precinct
- Windenoak
- Windsor
- Windsor Park (subdivision)
- Windsor, Township of
- Wine Hill
- Wine Hill Election Precinct
- Winfield
- Winfield, Township of
- Wing
- Winkel
- Winkle
- Winnebago
- Winnebago County
- Winnebago Court (subdivision)
- Winnebago, Township of
- Winneberger
- Winnemac (subdivision)
- Winneshiek
- Winnetka
- Winslow
- Winslow, Township of
- Winston
- Winterrowd
- Winthrop Harbor
- Winthrop Harbor Station
- Winthrop Village (subdivision)
- Witt
- Witt, Township of