| Dallas POS Systems | Texas |
| Dallas SEO Dogs | Texas |
| Dallas SEO Staff | |
| Dallas Startup Week | Texas |
| Dallas Tissue Research | Texas |
| Dallas Venture Capital | Texas |
| Dallas Website Design | Texas |
| Dalllas SEO Geek | |
| Dalmet Technologies, LLC | |
| Daloopa | |
| DALTA Group of Companies | |
| Dalton | |
| Dalton Bioanalytics | California |
| Dalton Computer Services, Inc. | Georgia |
| Dalton Design | California |
| Dalton State College | Georgia |
| Daly Computers, Inc. | Maryland |
| Daly Realism | |
| Daman, Inc. | Texas |
| Damar Software | Kansas |
| Damco Group | New Jersey |
| Dame Products, Inc. | New York |
| Damiano Global Corporation | |
| Daminion Corporation | |
| Damn Good Agency | |
| DAMONA Pharmaceuticals | |
| Damonaz Design, LLC | |
| Damstrong Systems, LLC | Vermont |
| Dan Auclair | California |
| Dan Hale Marketing, LLC | |
| Dan Hollings | Arizona |
| Dan McKinley | California |
| Dan Moriarty | Minnesota |
| Dan-Mar Company, Inc. | Ohio |
| Dana Consulting, Inc. | Minnesota |
| Dana Graphics, Inc. | Ohio |
| Dana Web Design | |
| Dana-Faber Cancer Institute | |
| DANAconnect Corporation | |
| Danaher Corporation | District of Columbia |
| Danavero, Inc. | |
| Dancing Mammoth | Virginia |
| Dandelion Marketing, LLC | Alabama |
| Dandelion Science | |
| Dandelions Digital Marketing | |
| Dandi Technologies, Inc. | New York |
| Dane Prairie Systems, LLC | Minnesota |
| Dane, LLC | |
| Danforth | |
| Danie Lyn The Brand | |