| CollBox | Texas |
| Collcomm, Inc. | New Mexico |
| Colle Capital | New York |
| Colle McVoy | |
| Collectable Technologies, Inc. | |
| Collectible Solutions, LLC | Florida |
| CollectionWorks | Georgia |
| Collectiv, LLC | |
| Collective Catalyst | |
| Collective Data, Inc. | Iowa |
| Collective Group | Texas |
| Collective Hub, Inc. | California |
| Collective Idea | Michigan |
| Collective Measures, Inc. | Minnesota |
| Collective Software, LLC | Illinois |
| CollectiveAccess | |
| CollectiveHealth, Inc. | California |
| Collectiveview, Inc. | Colorado |
| Collective[i] | New York |
| Collectly, Inc. | |
| Collector Systems | New York |
| Collectorpro Software, Inc. | Texas |
| Collectrium | New York |
| College at Southeastern | |
| College Board | |
| College Factual | |
| College for Creative Studies | Michigan |
| College of Alameda | California |
| College of Central Florida | Florida |
| College of Charleston | South Carolina |
| College of Charleston Department of Computer Science | South Carolina |
| College of Charleston Department of Mathematics and Statistics | South Carolina |
| College of Coastal Georgia Mathematics | Georgia |
| College of DuPage | Illinois |
| College of Eastern Idaho | Idaho |
| College of Idaho | Idaho |
| College of Lake County | Illinois |
| College of Marin | California |
| College of Menominee Nation | Wisconsin |
| College of Mount Saint Vincent | New York |
| College of New Jersey | New Jersey |
| College of Our Lady of the Elms | Massachusetts |
| College of Saint Benedict & Saint John's University Computer Science | Minnesota |
| College of Saint Benedict and Saint John's University Mathematics Department | Minnesota |
| College of Saint Mary | Nebraska |
| College of San Mateo | California |
| College of Southern Idaho | Idaho |
| College of Southern Maryland | Maryland |
| College of Southern Nevada | Nevada |
| College of St. Scholastica | Minnesota |