- Welding-industrial Supply Company
- Weldon Development Group LLC
- Wellness Lab
- Welovepopups
- Wendi Wolmer
- Wendy's
- West Branch Tattoo
- West Fifth, INC.
- Western Body Shop, INC.
- Western Tap, INC. DBA O's Tap, INC.
- Westside Paw Walkers LLC
- Wet Wet
- Whirlway Lounge INC
- Whirlyball
- Who's Next Barber Shop
- Willow Tree Child Care
- Willow Tree Child Care And Developmental Center Corporation
- Wilmot Construction INC.
- Wilton Cleaners
- Wilton Cleaners
- Windy City Hand Car Wash
- Wingstop
- Wireless Vision
- Wm Huber Cabinet Wks INC
- Wm. F. Meyer Co.
- Wolfbait & B-girls
- Won Auto Works
- Wonder Chop
- Wonderheart Studio LLC
- Wood Creations INC.
- Woodbridge Nursing Pavilion Lt
- Wordzwork2
- Workalicious
- Wyler Road
- Wyville USA
- X-it Moda Italia
- Xsport Fitness
- Xsport Fitness
- Yaba's Food And Grill
- Yanay Aesthetics
- Yankey Custom Billet
- Yodega
- Yoga Box Logan Square
- Yogaview, LLC
- Yohe' S Barber Shop
- Yor-yak
- Young American
- Young's Cleaners
- Your Happy Place Liquors
- Your Pet's Wellness - Bucktown
- Your Way Automotive
- Yu Hardware
- Z Smoke Shop
- Za Za Zoo Nail Salon INC.
- Za'atar Med Grill
- Zachary A. Design LLC
- Zachary Edwards
- Zachary Laipple
- Zachary Paul Vanheyningen
- Zazazoo Nail Salon
- Zazazoo Nails
- Zen Dogs Chicago INC.
- Zen Yoga Garage LLC
- Zepeda Auto Service
- Zion Leadership Group
- Zoom Room Chicago
- Zoungrana Group
- Zumwalt Audio