Organizers
- Winchester Little League
- Winchester Pop Warner
- Wind Combat System Inc.
- Wind Lake Youth Baseball/Softball
- Wind Watch Golf & Country Club
- Windcrest Golf Club
- Windells Academy
- Windells Camp
- Windermere Equestrian Center
- Windermere Lakers
- Windermere Preparatory School
- Windham Parks and Recreation
- Winding Creek Stables
- Winding River Golf Course
- Windmill Golf Center
- Windrush Farm Camp
- Windsor Forest
- Windsor Parke Golf Club
- Windsor State School
- Windsor Tennis Association
- Windswept Dunes Golf Club
- Windwood Park
- Windy City Fieldhouse
- Windy Hill Sports Complex
- Windyke Country Club
- Wine Country Half Series
- Wine Country Ride to Provide
- Wine Country Runs
- Wi-Ne-Ma Christian Camp
- Winer Events
- Winfield City High School
- Winfield Recreation Commission
- Winfield Warriors Wrestling
- Winfield Wolves
- Wing Tsun Illinois / Guerman's Martial Arts
- Wings for Life
- Wings for Life World Run
- Wings Gymnastics Society - CAD
- Wings of Hope
- Wingspan Arts
- Winks Volleyball Camp
- Winnebago Association of Kiteboarders
- Winneconne Youth Diamond Club
- Winnetka Community House
- Winning Touch
- Winona Fire Local 575
- Winona Gospel Church
- Winona ORC
- WinShape Marriage
- Winslow Cancer Support Group
