| AMERICAN INTERNATIONAL FILMS, INC.Narathon, FL · Inactive | Narathon, FL | Corporation | Nov 20, 1980 | Inactive |
| TASCOM-DUBOIS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Nov 24, 1980 | Inactive |
| STREAMINGBASE, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Aug 20, 2007 | Inactive |
| INTRATECH, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Feb 27, 2008 | Inactive |
| R. T. & W.,INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Dec 16, 1980 | Inactive |
| MONROE RESCUE INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Sep 3, 2010 | Inactive |
| ABC SAILING INC.Duck Key, FL · Inactive | Duck Key, FL | Corporation | Aug 29, 2011 | Inactive |
| CRAWFORD W. ADAMS, M.D., P.A.Marathon, FL · Inactive | Marathon, FL | Corporation | Dec 22, 1980 | Inactive |
| CINDYLYNN, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jan 12, 1981 | Inactive |
| EV-JO, INCORPORATEDMarathon, FL · Inactive | Marathon, FL | Corporation | Jan 23, 1981 | Inactive |
| BASEKAMP, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 14, 2016 | Inactive |
| TEACH USA, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Oct 11, 2016 | Inactive |
| JDLC, INC.Conch Key, FL · Inactive | Conch Key, FL | Corporation | Aug 8, 2017 | Inactive |
| DOLITTLE & BILLUM, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Feb 23, 1981 | Inactive |
| JANDA ASSOCIATES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 2, 1981 | Inactive |
| INTERNAV (FLORIDA), INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 3, 1981 | Inactive |
| ARNOLD'S DRIFTWOOD RESTAURANT AND LOUNGE, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 5, 1981 | Inactive |
| GETAM, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 6, 1981 | Inactive |
| EMPIRE PROCESSING SOLUTIONS, INCDuck Key, FL · Inactive | Duck Key, FL | Corporation | Jan 26, 2023 | Inactive |
| ELITE WOODWORKING INC.Marathon, FL · Active | Marathon, FL | Corporation | Dec 10, 2024 | Active |
| KEYS CONSTRUCTORS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 19, 1981 | Inactive |
| HAYNES TIMBERLAND, INC.Marathon, FL · Active | Marathon, FL | Corporation | Aug 17, 2026 | Active |
| PUUC, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 19, 1981 | Inactive |
| SURFSIDE GULF, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 24, 1981 | Inactive |
| SUN & SURF REFERRAL, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 27, 1981 | Inactive |
| SANNA ASSOCIATES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 30, 1981 | Inactive |
| NATURAL SPONGE AND RESEARCH COMPANY, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 2, 1981 | Inactive |
| DVL ENTERPRISES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 6, 1981 | Inactive |
| R.D.M. CONSTRUCTION, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 8, 1981 | Inactive |
| DINA'S CABINETS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 6, 1981 | Inactive |
| COCO OF MARATHON, INC.Marathon, FL · Active | Marathon, FL | Corporation | May 6, 1981 | Active |
| WHALER'S PLAZA, INC.Marathon, FL · Active | Marathon, FL | Corporation | May 6, 1981 | Active |
| KEYS VENDING, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 12, 1981 | Inactive |
| THE STUART ADVERTISING AGENCY, INC.Hollywood, FL · Inactive | Hollywood, FL | Corporation | May 13, 1981 | Inactive |
| J.S. SERVICE STATION, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 15, 1981 | Inactive |
| REED REALTY, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 9, 1981 | Inactive |
| OVERSEAS MORTGAGE CORPORATIONMarathon, FL · Inactive | Marathon, FL | Corporation | Apr 15, 1981 | Inactive |
| BAYARD PROPERTIES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 30, 1981 | Inactive |
| SEA SONS OF MARATHON, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 1, 1981 | Inactive |
| FITZ ENTERPRISES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 4, 1981 | Inactive |
| SOLAR ELECTRIC OF FLORIDA, INC.Duck Key, FL · Inactive | Duck Key, FL | Corporation | May 6, 1981 | Inactive |
| SZYMANSKI ROOF COATINGS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 8, 1981 | Inactive |
| BROWN & BALL, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 13, 1981 | Inactive |
| SURE POWER, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 21, 1981 | Inactive |
| COBIA COVE, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 17, 1981 | Inactive |
| BAY SEAFOOD OF THE FLORIDA KEYS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Aug 10, 1981 | Inactive |
| A & B EXTERMINATORS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 2, 1981 | Inactive |
| CRAIG LEE SMITH, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 4, 1981 | Inactive |
| S.T.S.C. SEA TRANSPORT SHIPPING CORPORATIONMarathon, FL · Inactive | Marathon, FL | Corporation | Jun 8, 1981 | Inactive |
| SOMBRERO TEXACO SERVICE, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 11, 1981 | Inactive |