| MARATHON BAND BOOSTERS, INC.Marathon, FL · Active | Marathon, FL | Nonprofit | Sep 29, 2005 | Active |
| SUNDANCE VILLAGE MOBILE HOME OWNERS ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | May 10, 2000 | Inactive |
| SAVE SOMBRERO BEACH ROAD, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Dec 18, 2014 | Inactive |
| CONCH REPUBLIC CORVETTE CLUB OF THE FLORIDA KEYS, INC.Big Pine Key, FL · Inactive | Big Pine Key, FL | Nonprofit | Nov 28, 1994 | Inactive |
| MARATHON ART GUILD, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Nonprofit | Jan 26, 1995 | Inactive |
| HEALTHECO, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Mar 8, 1996 | Inactive |
| SUMMERLAND BEACH NEIGHBORHOOD ASSOCIATION, INC.Summerland Key, FL · Inactive | Summerland Key, FL | Nonprofit | Jun 23, 1997 | Inactive |
| BBAN ENTERPRISES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 19, 2004 | Inactive |
| BZ SUPPORT SERVICES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 6, 2005 | Inactive |
| CARNIVAL CANVAS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 16, 2015 | Inactive |
| MUSCLE THEORY INC.Marathon, FL · Inactive | Marathon, FL | Corporation | May 28, 2015 | Inactive |
| AMAZONIA EXPEDITIONS BR, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jul 13, 2015 | Inactive |
| HUMANSIDE, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Oct 15, 2015 | Inactive |
| W.E.B. CLEANING, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Oct 16, 2015 | Inactive |
| 98TH STREET PROPERTIES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 24, 2016 | Inactive |
| 7 MILE WATER SPORTS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 28, 2016 | Inactive |
| THE CAUSE OF HEALTH, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 15, 1993 | Inactive |
| ACTION CHIROPRACTIC AND HEALTH CENTER, P.A.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 15, 1993 | Inactive |
| FLORIDA SEA LIFE, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 18, 1993 | Inactive |
| RANDY ARNOLD'S METRIC MOTORS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 3, 1993 | Inactive |
| CHARLIE WILLIAMS PLASTERING, INC.Key Colony Beach, FL · Inactive | Key Colony Beach, FL | Corporation | Oct 5, 1993 | Inactive |
| KEY WEST SIGN & LIGHT, INC.Key West, FL · Inactive | Key West, FL | Corporation | Oct 12, 1993 | Inactive |
| LITTLE GROCER, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jan 3, 1994 | Inactive |
| CONCH SHELL INVESTMENT GROUP, INC.Key Largo, FL · Inactive | Key Largo, FL | Corporation | Apr 18, 1994 | Inactive |
| GUILDFORD ASSOCIATES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jan 23, 1995 | Inactive |
| PROGRESSIVE INVESTMENTS, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Mar 30, 1995 | Inactive |
| GMLC ENTERPRISES, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 14, 1995 | Inactive |