| Chicago Computer Supply, Inc. | Illinois |
| Chicago ComputerLand, LLC | Illinois |
| Chicago Internet Marketing | Illinois |
| Chicago Marine Electronics | Illinois |
| Chicago Microsystems, Inc. | Illinois |
| Chicago Network Cabling & Fiber Optic Wiring | Illinois |
| Chicago Perl Mongers | Illinois |
| Chicago Producers, Inc. | |
| Chicago Producers, Inc. | |
| Chicago Python User Group | Illinois |
| Chicago Quantum Exchange | Illinois |
| Chicago Research Center, Inc. | Illinois |
| Chicago SEO Company | Illinois |
| Chicago Software Process Improvement Network | Illinois |
| Chicago State University | Illinois |
| Chicago Tech Support | Illinois |
| Chicago Tech, Inc. | Illinois |
| Chicago Ventures | Illinois |
| Chicago Web Management | Illinois |
| Chicago Webdesign Studio | Illinois |
| Chicago-Soft Ltd | Illinois |
| Chicagoland Cloud | Illinois |
| Chicagoland SEO Company | |
| ChicagoNet | Illinois |
| ChicagoRuby | Illinois |
| ChicagoTech.net | Illinois |
| ChicagoWeb | |
| Chicaog Web Works | |
| Chickadee Games, LLC | Maine |
| Chickamauga Telephone Corporation | Georgia |
| Chickasaw Communications | Oklahoma |
| Chickasaw Nation Industries, Inc. | Oklahoma |
| Chicken Systems, Inc. | Tennessee |
| ChickTech | Oregon |
| Chico Web Design | California |
| Chico.Net | California |
| Chicopee Electronics Corporation | Massachusetts |
| Chicory | New York |
| Chief | New York |
| Chief Architect, Inc. | Idaho |
| Chief Dull Knife College | Montana |
| Chief Metaverse Officer Corporation | |
| ChiefDigitalOfficer.net | Massachusetts |
| ChiefSymbols | New York |
| Chiesi USA, Inc. | North Carolina |
| ChildPlus Software | Georgia |
| Childress Agency, Inc. | |
| Chile Media | Texas |
| Chili Pepper Consulting | Massachusetts |
| ChiliPepperWeb.net | Texas |