| HIPPOCAMPUS ESTATES HOMEOWNERS ASSOCIATION, INC.Marathon, FL · Active | Marathon, FL | Nonprofit | Aug 12, 2025 | Active |
| BONEFISH HARBOR HOMEOWNERS ASSOCIATION INC.Marathon, FL · Active | Marathon, FL | Corporation | Nov 22, 2024 | Active |
| KEY VACA HOMEOWNERS ASSOCIATION LLCMarathon, FL · Active | Marathon, FL | LLC | Nov 22, 2024 | Active |
| KEYS MAP HOUSE LLCMarathon, FL · Active | Marathon, FL | LLC | Aug 4, 2022 | Active |
| WANCHESE LLCMarathon, FL · Active | Marathon, FL | LLC | Oct 30, 2019 | Active |
| HIPPOCAMPUS II LLCMarathon, FL · Active | Marathon, FL | LLC | Apr 28, 2017 | Active |
| SEAVIEW COMMONS, LLCMarathon, FL · Active | Marathon, FL | LLC | Jun 17, 2003 | Active |
| C.B. SCHMITT CHARITABLE FOUNDATION, INC.Marathon, FL · Active | Marathon, FL | Nonprofit | Aug 12, 2002 | Active |
| TOTAL ELECTRIC SOLUTIONS INC.Location not reported, FL · Active | Location not reported, FL | Corporation | Sep 15, 2025 | Active |
| SCHMITT, ALAN G. INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jun 1, 1973 | Inactive |
| COLDWELL BANKER SCHMITT REAL ESTATE CO.Marathon, FL · Active | Marathon, FL | Corporation | Nov 12, 1974 | Active |
| RAINBOW OIL CO.Marathon, FL · Inactive | Marathon, FL | Corporation | Aug 1, 1977 | Inactive |
| THE BOAT INN, INC.Islamanda, FL · Inactive | Islamanda, FL | Corporation | Nov 30, 1978 | Inactive |
| ORION BANCORP, INC.Naples, FL · Inactive | Naples, FL | Corporation | Feb 24, 1988 | Inactive |
| TAMPA AIRPORT PARKING, LLCMarathon, FL · Inactive | Marathon, FL | LLC | Aug 1, 2002 | Inactive |
| MARATHON SERVICE CENTER, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Aug 31, 1989 | Inactive |
| ORION BANKNaples, FL · Inactive | Naples, FL | Corporation | Jan 25, 2002 | Inactive |
| FLORIDA KEYS REAL ESTATE & RENTALS COMPANYMarathon, FL · Inactive | Marathon, FL | Corporation | Aug 30, 2002 | Inactive |
| FLORIDA KEYS REAL ESTATE TRAINING CO., INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Apr 26, 2005 | Inactive |
| ZANE GREY DEVELOPMENT COMPANYMarathon, FL · Inactive | Marathon, FL | Corporation | May 19, 2005 | Inactive |
| SEAVIEW COMMONS II HOMEOWNERS ASSOCIATION INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Nov 22, 2024 | Inactive |
| OCYPODE HOMEOWNERS ASSOCIATION INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Nov 22, 2024 | Inactive |
| C B SCHMITT REAL ESTATE COMPANY, INC.Marathon, FL · Active | Marathon, FL | Corporation | May 14, 1996 | Active |
| FLORIDA KEYS PROPERTY REFERRALS COMPANYMarathon, FL · Active | Marathon, FL | Corporation | May 1, 1997 | Active |
| FLORIDA KEYS VACATION RENTALS, INC.Marathon, FL · Active | Marathon, FL | Corporation | Nov 13, 1998 | Active |
| PRESTIGE ISLAND PROPERTIES CO.Marathon, FL · Active | Marathon, FL | Corporation | Jan 14, 1999 | Active |
| OCYPODE, INC.Marathon, FL · Inactive | Marathon, FL | Corporation | Jul 20, 1999 | Inactive |