| CisLunar Industries | Colorado |
| Cisnet Internet Services | Ohio |
| Cistech, Inc. | North Carolina |
| Cisterna Biologics | |
| CIT Ortho | Ohio |
| Citacomp, LLC | Colorado |
| Citadel Enterprise Americas, LLC | |
| Citara Systems, Inc. | Massachusetts |
| Citation Software, Inc. | Maine |
| Citcon USA, LLC | California |
| Citel, Inc. | Florida |
| Citia | |
| Citian | |
| Cities Digital, Inc. | Wisconsin |
| Citisoft | Massachusetts |
| Citius Oncology, Inc. | |
| Citius Pharmaceuticals, Inc. | |
| CitiusTech, Inc. | New Jersey |
| Citiux Corporation | Florida |
| CitiXsys | New York |
| Citizen Developer | Pennsylvania |
| Citizen Health | |
| Citizen Health | |
| Citizens Federal Savings and Loan | |
| Citizens Telecom Solutions | Pennsylvania |
| Citizens Telephone Company | |
| CITOC | Texas |
| Citon Computer Corporation | Wisconsin |
| Citranvi Biosciences, LLC | North Carolina |
| Citrine | California |
| Citrine Angels | District of Columbia |
| Citrine Capital Partners | Arizona |
| CITRIS Foundry | California |
| Citrix Systems, Inc. | Florida |
| Citrus Media, Inc. | |
| Citrus Studios, Inc. | |
| Citrus Studios, Inc. | |
| CitrusBits | California |
| CitrusBits, Inc. | |
| CitrusKiwi Web Solutions, LLC | Arizona |
| Citus Data, Inc. | California |
| City & National Employment | Iowa |
| City College of New York Department of Computer Science | New York |
| City College of New York Department of Electrical Engineering | New York |
| City College of New York Department of Mathematics | New York |
| City College San Francisco | California |
| City Colleges of Chicago | Illinois |
| City Hive, Inc. | |
| City Light | New York |
| City Line Capital | Pennsylvania |