| FISHERMEN'S POINTE ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Feb 8, 1984 | Inactive |
| CASA CAYO CONDOMINIUM ASSOCIATION, INC.Marathon, FL · Active | Marathon, FL | Nonprofit | Feb 13, 1984 | Active |
| MARATHON DUKES BASEBALL, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Mar 28, 2002 | Inactive |
| HIGHERLOVE MISSION OUTREACH, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Aug 5, 2002 | Inactive |
| UNITY OF MARATHON, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Sep 18, 2002 | Inactive |
| WHISPERING PINES MOBILE HOME PARK HOMEOWNERS ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Dec 2, 2002 | Inactive |
| WALLORIS PROPERTY OWNERS ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Apr 30, 2003 | Inactive |
| FLORIDA KEYS SOCCER CLUB, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jul 28, 2003 | Inactive |
| ALL KEYS SOFTBALL, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Aug 4, 2003 | Inactive |
| KEYSWIDE ORGANIZATION FOR THE PRESERVATION OF AFFORDABLE HOUSING, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Oct 21, 2003 | Inactive |
| BIG PINE KEY CONCERNED CITIZENS, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | May 21, 1984 | Inactive |
| SOMBRERO BOULEVARD PROPERTY OWNERS ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jun 8, 1984 | Inactive |
| HANDS ON HANDS, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jan 27, 2004 | Inactive |
| MARATHON HOSPITALITY ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Feb 20, 2004 | Inactive |
| SOMBRERO PROPERTIES CONDOMINIUM ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Mar 12, 2004 | Inactive |
| MARATHON BEACH COMMUNITY ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Mar 17, 2004 | Inactive |
| MIDDLE KEYS EVENTS COUNCIL, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jun 1, 2004 | Inactive |
| FLORIDA KEYS SAFETY COUNCIL, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Aug 30, 2004 | Inactive |
| HIBISCUS COURT CONDOMINIUM ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Oct 18, 2004 | Inactive |
| NEW THOUGHT COMMUNITY CHURCH OF MARATHON, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Nov 17, 2004 | Inactive |
| OLD TOWN MERCHANTS ASSOCIATION INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Dec 20, 2004 | Inactive |
| MARATHON FLYING CLUB, INC.Marathon, FL · Active | Marathon, FL | Nonprofit | Jul 23, 1984 | Active |
| FLORIDA KEYS COMMUNITY ENVIRONMENT, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Aug 24, 1984 | Inactive |
| FLORIDA KEYS AIRPORT INITIATIVE, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jan 27, 2005 | Inactive |
| PELICAN POND CONDOMINIUM ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Feb 1, 2005 | Inactive |
| ROTARY PARK NEIGHBORHOOD ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Mar 30, 2005 | Inactive |
| MARATHON COMMUNITY CLASSIC, INCMarathon, FL · Inactive | Marathon, FL | Nonprofit | Apr 13, 2005 | Inactive |
| MR PO, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Apr 21, 2005 | Inactive |
| RIVER CHILDREN, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jun 30, 2005 | Inactive |
| MARATHON CHURCH OF GOD INCORPORATEDMarathon, FL · Active | Marathon, FL | Nonprofit | Aug 10, 2005 | Active |
| FLORIDA KEYS MARINE INDUSTRIES ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Sep 6, 2005 | Inactive |
| KEY VACA CONDOMINIUM ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Dec 6, 2005 | Inactive |
| BOOT KEY SAILORS ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Nov 17, 2005 | Inactive |
| THE UPPER ROOM CHURCH OF GOD IN CHRIST MINISTRIES OF FLORIDA, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Sep 28, 1984 | Inactive |
| THE RIDE FOR THE LADY FUND, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Oct 9, 1984 | Inactive |
| DORSETT SUBDIVISION PROPERTY OWNERS ASSOCIATION, INC.Marathon, FL · Active | Marathon, FL | Nonprofit | Oct 26, 1984 | Active |
| VETERANS HAVEN, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jan 26, 2006 | Inactive |
| FLORIDA KEYS BIRDING AND WILDLIFE FESTIVAL, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Apr 7, 2006 | Inactive |
| COSTA ATLANTICA COMMUNITY & CONSERVATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Apr 19, 2006 | Inactive |
| MARATHON PROFESSIONAL CENTER CONDOMINIUM ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | May 26, 2006 | Inactive |
| MARATHON YOUTH SAILING, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jun 23, 2006 | Inactive |
| SAVE OLD SEVEN FOUNDATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Aug 21, 2006 | Inactive |
| FRIENDS OF THE DOLPHIN RESEARCH CENTER, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Oct 10, 2006 | Inactive |
| KEYS SOCCER CLUB, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Dec 8, 2006 | Inactive |
| HEATH JENS LAETARI MEMORIAL FUND, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jan 2, 2007 | Inactive |
| MINISTERIO UNIDOS EN AMOR-MARATHON, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jan 17, 2007 | Inactive |
| NATE GRILL SCHOLARSHIP FOUNDATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Mar 28, 2007 | Inactive |
| PLAZA DEL MAR CONDOMINIUM ASSOCIATION, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jun 12, 2007 | Inactive |
| KEYS COMMUNITY CHURCH INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Jul 3, 2007 | Inactive |
| MARITIME MINISTRIES OF SOUTH FLORIDA & CARIBBEAN, INC.Marathon, FL · Inactive | Marathon, FL | Nonprofit | Oct 31, 2007 | Inactive |