- Chick-fil-a Loyola Water Tower
- Chicken Airplane Soldier
- Chickie Curls Studio LLC
- Chico's
- Children's Oncology Services
- China Doll
- China Eastern Airlines
- Chipotle Mexican Grill
- Chitown Bodega
- Chitown Bodega 1
- Chitown Lock
- Chkn Box
- Chorbe LLC
- Christel P Reum
- Christian Brokerud Fine Woodworking
- Christian Dior Couture
- Christian Louboutin LLC
- Christian Ruiz
- Christie's INC.
- Christine Janda Design & Events
- Christine Noelle Design
- Christopher Gibson
- Christopher Haslett
- Christopher Peacock Cabinetry
- Christopher Peacock Cabinetry
- Churchmouse, INC.
- Churro Factory
- Ci Digital
- Cidney Medina
- Cilantro Taco - Old Town
- Cilantro Taco Grill Old Town
- Circa
- Circa Lighting LLC
- Circle K
- Circle Logistics INC.
- Citadel Enterprise Americas LLC
- Cite Restaurant
- Citizens United For Research In Epilepsy
- City Capital Advisors LLC
- City Club Of Chicago
- City Front Plaza Cleaners
- City Haus Chicago
- City Lake Law LLC
- City Scents
- Cityview Drycleaners
- Citywide Park INC.
- Cjy Cleaning LLC
- Claire's #1954
- Claire's #1954
- Clara Food Technology
- Claridge House
- Clark - N - Oak Animal Health Center, INC.
- Clark Street Ale House
- Clay Son's Landscaping + Snowplowing
- Clean Scent Cleaning
- Clean Your Dirty Face- River North
- Clear Channel Outdoor
- Cleise Brazilian Day Spa
- Cleverbridge, INC.
- Cleverfranke INC.
- Closerlook INC
- Cloud9 Windy City LLC
- Club 33
- Club Gene & Georgetti
- Club Lago
- Club Monaco Us LLC
- Club Pilates River North
- Club33 Fitness
- Cmc & Maintenance, INC.
- Cmk Companies LTD.
- Cnn America, INC.
- Coach
- Coach
- Coalfire Systems, INC.
- Coast Yachts
- Cobble Square Investors Limited Partnership
- Cobblesquare Place Associates
- Cockerham & Associates, LLC
- Coco
- Coco & Kitty
- Coco Pazzo
- Coco Pazzo Cafe
- Coconutz
- Cocooncaretm
- Cocoro
- Code B Magazine
- Codehs, INC.
- Codeverse Lincoln Park
- Coe-truman Technologies, INC.
- Coil And Bloom
- Coinflow
- Coke Craze Collection
- Cold Moon Cafe
- Cold Stone Creamery #23263
- Collin Joseph Van Cuyk
- Colombia Cosmetics Mfg INC.
- Colonie Media, LLC
- Color By Stacie
- Color Gurlz Cosmetics
- Colores Mexicanos
- Comcast Cable Communications Management, LLC
- Comcast Sportsnet Chicago, LLC
- Companion Animal Hospital Of River North
- Companion Animal Hospital River North
- Completely Nuts, INC.
- Computer Training Source, INC.
- Conagra Foods Enterprise Services, INC.
- Concierge Aesthetics And Plastic Surgery
- Conde Nast
- Confidence Apparel
- Connect Roasters, INC.
- Connect3today, LTD.
- Conotoxia, INC.
- Conrad Chicago
- Contemporary Nannies
- Contemporary Preschool, LLC
- Contractor 360 LLC
- Contrast Design Group
- Converse
- Cook M&a Advisory Services, INC.
- Cooperate Marketing, LLC
- Copado
- Copper Range Photography
- Copperfields Market
- Cordogan,clark & Associates
- Core Capital Management, LLC
- Core Evolution
- Corepower Yoga
- Corey's Nyc Bagel Deli
- Corner Bakery Cafe
- Cornerstone Child Care Center
- Corporate Cleaning Service
- Corporate Financial Gp Inc/smith Economics Group, LTD.
- Cort Furniture Rental Corp
- Corvus Janitorial Systems
- Cory Paeth, LLC
- Cos
- Cosentino North America
- Cosmedent INC.
- Cosmetic Clinic
- Cotacachi Handy Crafts
- Couponcabin LLC
- Courtney Davidek
- Courtyard By Marriott/gladsome's On State
- Cozey Usa, INC.
- Cp2 Management
- Cps Parking
- Craftily
- Craig Ginnan
- Crash Champions, LLC
- Cream And Concrete
- Create & Capture Studios
- Creative Circle, LLC
- Creative Mirror Designs, INC.
- Cresco Labs, LLC
- Cresta Communications, INC
- Cristina Nunez
- Crosell Ii
- Cross Connect Services LLC
- Crosslyne Corporation
- Crosstown Fiber Il LLC
- Crowell & Moring LLP
- Crown Home Health Services INC.
- Crowned Tree Atelier LLC
- Crumbl Cookies Chicago Old Town
- Crushed By Giants
- Cryoeffect
- Crystal Cleaners
- Crystal Fantasies
- Crystal Nails
- Crystal Room Chicago
- Crystal's Gallery
- Cullen Construction Management
- Culligan Collective LLC
- Cupitol Coffee & Eatery
- Curo Management LLC
- Currency Exchange International
- Curtis Blake
- Cushing And Company
- Cushman & Wakefield U.s., INC.
- Custom Eyes
- Cutler Oil & Gas Corporation
- Cutting Club
- Cuub
- Cuvee
- Cvs/pharmacy #3742
- Cvstom Co.
- Cw Brand Solutions LLC
- Cynthia Inch INC.
- D4 Irish Pub & Cafe
- Daboul Avenue
- Dailey Woodworking
- Daily Burn Candle Studio
- Daily Planet Productions, LTD.
- Daisy Moon LLC
- Dak-remington M. Confidant
- Dalal Food W Liquor INC
- Dame Creative
- Damen 4 Management Of Illinois, LLC
- Dan Rak Design Group