- Concrete Strategies LLC
- Conduent Business Services, LLC
- Conexiom
- Conference Center Concepts LLC
- Congaree River LLC
- Congress Plaza
- Conn-selmer, INC.
- Connamara Systems, LLC
- Connecthr LLC
- Connection Matters, INC.
- Conotoxia, INC.
- Consolidated Trading LLC
- Constellation New Energy INC.
- Consultigence Corporation
- Contigo Brands, Bubba Brands,rubermaid Beverage,ignite USA
- Continental Advisors LLC
- Continental Materials Corp
- Continuum
- Control Risks Group, LLC
- Convene
- Convene
- Convene At 16 West Adams / Convene At 131 South Dearborn
- Convene At 311 West Monroe/for Five Chicago
- Convenience 35
- Converge Medical Technology LLC
- Cooley LLP
- Cooper Coleman LLC
- Cooperativa Ceramica D'imola North America INC
- Copper Club
- Coralie Coffee
- Corcoran Expositions, INC
- Core Erectors Il LLC
- Corepower Yoga
- Corner Bakery Cafe
- Corner Bakery Cafe 167
- Cornerstone Research, INC.
- Corporate Concepts, INC.
- Corporate Concierge Services, INC.
- Corporate Traveler, Fcm Travel Solutions
- Cosentini Associates, INC.
- Cotter Consulting INC.
- Cox & Kings Global Services USA LLC
- Cox Commercial Cleaning
- Cps Parking
- Cqg
- Crafty Cafe
- Crafty Cafe
- Crafty Cafe - 20 S Wacker, LLC
- Crain Communications, INC.
- Cramer - Krasselt Co
- Crave Cookies & Soda
- Creative & Response Res
- Creative Tax Solutions
- Credit Interlink INC.
- Creditbility
- Cressey & Company LP
- Cricket Media
- Crimson Coward
- Crisjon Fine Jewelry, INC.
- Cross Connect Services LLC
- Cross Town Auto Park
- Crosscountry Consulting LLC
- Crowdfind, INC.
- Crowe Horwath LLP
- Crown Castle Fiber, LLC.
- Crown Imports, Constellation Brands, Tocayo Brewing Company
- Crumbl Cookies
- Crushcontracts
- Cryoeffect Cryotherapy Coldspa
- Crystal Equation Corporation
- Crystal Gems, INC
- Crystal Turner
- Cs Books & Records
- Csa Education
- Csg
- Csg
- Csg Media, LLC
- Csi Leasing, INC.
- Css, LLC
- Ct Corporation System
- Ctc Trading Group LLC
- Ctichicago
- Cullerton Group
- Cumming Management Group, INC.
- Curis Technologies
- Curry Blah Blah
- Cushman & Wakefield Of Illinois, INC.
- Cushman & Wakefield U.s., INC.
- Custodial Solutions LLC
- Custom Eyes
- Custom Life Closets LLC
- Customize Your Career, LLC
- Cuticle...a Nail Salon
- Cutler Group LP
- Cutler Group, LLC
- Cvs/pharmacy #10942
- Cvs/pharmacy #3674
- Cwj Chicago
- Cwp Management, INC.
- Cwt Us, LLC
- Cxliv Enterprise LLC
- Cynasure
- D's Custom Jewelry LLC
- D'vicino Master Jewelers
- Da Book Joint
- Da Local Boy
- Dakota Systems, Incorporated
- Dakshin Indian Restuarant
- Dan Cosgrove Design LLC
- Dana Bender Wellness, LLC
- Dance For Life
- Daniel J. Edelman Holdings, INC.
- Daniel J. Edelman, INC
- Daniel Levy Jewelry
- Daniel Nowak Watch Repair
- Daniel Son
- Daniels Health
- Danke Market
- Danny And Debbie Jewelers
- Danny's Jewelry Shop INC.
- Darcy Bonner & Associates
- Daria Peterson
- Das & Associates, INC.
- Dashing Chicago
- Data Climb LLC
- Data Defenders, LLC
- Data Products LLC
- Datalogics INC
- Datamade
- Datasite
- Datassential Research
- Daubenspeck And Associates Limited
- Dave's Confectionery
- David Csicsko Illustration
- Davis And Associates, Attorneys At Law, LLC
- Davis Harrison Dion INC
- Day-2-day Healthcare Staffing Firm LLC
- Daylight L3c
- Dayspring Professional Janitorial Service Incorporated
- Dazzle Nails Spa
- DBA Ever.ag
- DBA Garrett Popcorn Shops
- Dc Data Corporation
- Ddb Chicago INC.
- Ddn Consulting INC
- Ddt Data Processing, LLC
- De Paul University
- Deanna Tipton
- Dearborn Denim & Apparel
- Dearborn Harrison Parking INC.
- Dearborn Parking Corp.
- Dearborn Partners, LLC
- Dearborn Sourcing LLC
- Deborah Berry Agency
- Decision Spot LLC
- Decorating Solutions By Janet
- Deep Kleen And Maintenance LLC
- Deep Purpl
- Deep Purple / Fons
- Deepline INC
- Defencen Security
- Dei Giovani
- Delinquency Prevention Services, INC.
- Delmonico
- Deloitte & Touche Usa, LLP
- Delta Institute
- Dema Agency Consultants LLC
- Dennemeyer & Co., LLC
- Denodo Technologies INC
- Dept Of Rehabilitation Svc/vfp
- Design Museum Of Chicago
- Design Window Solutions
- Design2rave LLC
- Designers Market Block 37
- Designs By Rosa, INC.
- Desired Fashion
- Destify
- Dethlefsen & Balk INC.
- Deutsche Boerse Systems INC.
- Deutsche Leasing
- Development Specialists INC
- Devil Dawgs On State Street, LLC
- Dhl Express (usa), INC.
- Dhr Global
- Dia By Dia LLC
- Diageo Americas, INC.
- Diamantra, INC.
- Diamond & Gold Creations
- Diamond Consultants
- Diamond Parking Service INC.
- Diamond Point Management LLC
- Diamonds Of South Africa
- Diamonds On Wabash, INC.
- Diana Slaviero Art Studio
- Diana's Nail & Spa
- Diaview INC.
- Diesel Sales
- Digital Printers Square, LLC
- Dimend Scaasi
- Direct Improvements LLC