| OAK RIDGE WOODLANDS HOME OWNERS ASSOCIATION, INC.Keystone Hts, FL · Inactive | Keystone Hts, FL | Nonprofit | May 21, 1979 | Inactive |
| KEYSTONE UNITED METHODIST CHURCH, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Jan 4, 1980 | Inactive |
| ARI WOODS ASSOCIATION, INC.Keystone Heights, FL · Active | Keystone Heights, FL | Nonprofit | Apr 30, 1980 | Active |
| GENEVA SPRINGS I CONDOMINIUM ASSOCIATION, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Jun 30, 1980 | Inactive |
| GENEVA SPRINGS II CONDOMINIUM ASSOCIATION, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Oct 14, 1980 | Inactive |
| CHRIST EVANGELICAL LUTHERAN CHURCH OF KEYSTONE HEIGHTS, FLORIDA, INC.Keystone Heights, FL · Active | Keystone Heights, FL | Nonprofit | Jan 28, 1981 | Active |
| CLAY COUNTY VOLUNTEER FIRE DEPARTMENT #23, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Feb 11, 1981 | Inactive |
| GENEVA SPRINGS III CONDOMINIUM ASSOCIATION, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Mar 24, 1981 | Inactive |
| GENEVA SPRINGS IV CONDOMINIUM ASSOCIATION, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Jul 6, 1981 | Inactive |
| LONG LAKE ACRES PROPERTY OWNERS' ASSOCIATION, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Aug 6, 1981 | Inactive |
| LIGHT FOR LIFE MINISTRIES, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Dec 30, 1981 | Inactive |
| CHRISTIAN JOY MINISTRIES, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Apr 26, 1982 | Inactive |
| PENTECOSTAL APOSTOLIC SABBATH ASSEMBLY, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Aug 16, 1982 | Inactive |
| KEYSTONE AERO CLUB, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Nonprofit | Mar 18, 1983 | Inactive |
| CLAY ELECTRIC COOPERATIVE, INC.Keystone Heights, FL · Active | Keystone Heights, FL | Nonprofit | Dec 9, 1937 | Active |
| KEYSTONE EGG COOPERATIVELocation not reported, FL · Inactive | Location not reported, FL | Nonprofit | Jun 12, 1967 | Inactive |
| LAWRENCE DEVELOPING COMPANYLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Dec 1, 1919 | Inactive |
| PSD, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Feb 28, 1977 | Inactive |
| LTB AND LMB FAMILY LIMITED PARTNERSHIPKeystone Heights, FL · Inactive | Keystone Heights, FL | Partnership | Feb 1, 2001 | Inactive |
| BYROM HOLDINGS, LLLPKeystone Heights, FL · Inactive | Keystone Heights, FL | Partnership | Jan 31, 2011 | Inactive |
| HJ PARTNERS, LLLPKeystone Heights, FL · Inactive | Keystone Heights, FL | Partnership | May 1, 2013 | Inactive |
| LAKESIDE ESCAPES EH LIMITED PARTNERSHIPKeystone Heights, FL · Inactive | Keystone Heights, FL | Partnership | Jun 23, 2022 | Inactive |
| MIMOSA FOREST, LTD.Keystone Heights, FL · Inactive | Keystone Heights, FL | Partnership | Feb 27, 1986 | Inactive |
| FLYING FROG MUSHROOMS LPKeystone Heights, FL · Inactive | Keystone Heights, FL | Partnership | Sep 11, 2024 | Inactive |
| GOLDHEAD, LTD.Keystone Heights, FL · Inactive | Keystone Heights, FL | Partnership | Apr 14, 1988 | Inactive |
| J. FRED JOHNSON FAMILY LIMITED PARTNERSHIPKeystone Hts, FL · Inactive | Keystone Hts, FL | Partnership | May 13, 1996 | Inactive |
| DIOMEDICS, INC.Keystone Height, FL · Inactive | Keystone Height, FL | Corporation | Apr 24, 2002 | Inactive |
| HCC ENVIRONMENTAL SERVICES, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Nov 4, 1980 | Inactive |
| RICHARD ROBERTS INSURANCE, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Jan 7, 1981 | Inactive |
| R.T. LOVORN, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Feb 4, 1981 | Inactive |
| JOHN D. BROWN HOME CENTER, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Mar 2, 1981 | Inactive |
| OMEGA METALS, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Mar 9, 1981 | Inactive |
| CLARKE'S MEAT MARKET, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Apr 17, 1981 | Inactive |
| NATIONAL REMANUFACTURED BATTERY COMPANY, INC.Keystone Hts, FL · Inactive | Keystone Hts, FL | Corporation | Apr 2, 1981 | Inactive |
| KEYSTONE HEIGHTS ANIMAL HOSPITAL LAWRENCE E. PARRISH, D.V.M., P.A.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | May 1, 1981 | Inactive |
| W.S. MCGILL INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Sep 8, 1981 | Inactive |
| RICHARD W. ODOM, D.M.D., P.A.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Sep 29, 1981 | Inactive |
| KEYSTONE SECURITIES, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Nov 18, 1981 | Inactive |
| LANSING J. ROY, P. A.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Nov 13, 1981 | Inactive |
| HAUGLI INSTALLATIONS, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Dec 7, 1981 | Inactive |
| JAMES W. PATRAY, JR., M.D., P.A.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Dec 1, 1981 | Inactive |
| KEYSTONE COFFEE COMPANY, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Feb 15, 1982 | Inactive |
| HALCYON FARMS, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Feb 22, 1982 | Inactive |
| BRYAN'S ACE HOME CENTER, INC.Keystone Heights, FL · Active | Keystone Heights, FL | Corporation | Jun 23, 1982 | Active |
| JIM TEMPLE CONSTRUCTION, INC.Keystone Heights, FL · Active | Keystone Heights, FL | Corporation | Jul 19, 1982 | Active |
| WATKINS CUSTOMS BROKERS, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Jul 20, 1982 | Inactive |
| FLORIDA CENTRAL DISPATCH, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Jul 23, 1982 | Inactive |
| H.C.KEL ENTERPRISES, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | May 1, 1995 | Inactive |
| EXPORTERS, INC.Keystone Heights, FL · Inactive | Keystone Heights, FL | Corporation | Dec 11, 1998 | Inactive |
| SABO'S PIZZA, INC.Keystone Hgts, FL · Inactive | Keystone Hgts, FL | Corporation | Oct 7, 1982 | Inactive |