| GTC, LLLPNew Port Richey, FL · Active | New Port Richey, FL | Partnership | Feb 27, 2020 | Active |
| BLACKWELL MANAGEMENT, LLCNew Port Richey, FL · Active | New Port Richey, FL | LLC | Feb 20, 2020 | Active |
| VISTA PARK PROPERTY OWNERS ASSOCIATION, INC.New Port Richey, FL · Active | New Port Richey, FL | Nonprofit | Oct 2, 2014 | Active |
| GARY L. BLACKWELL CHARITABLE FOUNDATION, INC.New Port Richey, FL · Active | New Port Richey, FL | Nonprofit | Dec 20, 2013 | Active |
| 5415, INC.New Port Richey, FL · Active | New Port Richey, FL | Corporation | Jan 18, 2013 | Active |
| COUNTY LINE TRADE CENTER PROPERTY ASSOCIATION, INC.New Port Richey, FL · Active | New Port Richey, FL | Nonprofit | Apr 10, 2000 | Active |
| SECURITY BUILDERS INCNew Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Nov 16, 1965 | Inactive |
| PONDEROSA PARKS INCNew Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Sep 17, 1969 | Inactive |
| BOYWELL DEVELOPMENT CORPORATIONNew Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Jun 9, 1972 | Inactive |
| INTERLOCK INVESTMENTS, INC.New Point Richey, FL · Active | New Point Richey, FL | Corporation | Sep 5, 1978 | Active |
| GARY L. BLACKWELL INVESTMENTS, INC.New Port Richey, FL · Active | New Port Richey, FL | Corporation | Apr 16, 1979 | Active |
| BLACKWELL LEXINGTON, LIMITED PARTNERSHIPNew Port Richey, FL · Inactive | New Port Richey, FL | Partnership | Apr 4, 2005 | Inactive |
| BAY PLACE DEVELOPMENT CORPORATIONPort Richey, FL · Inactive | Port Richey, FL | Corporation | Nov 3, 1980 | Inactive |
| INVERNESS LAND COMPANY, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Feb 1, 2000 | Inactive |
| LAGO DEVELOPMENT, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Sep 28, 2004 | Inactive |
| LEE CLARK, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Oct 27, 2009 | Inactive |
| SOUTHERN LEISURE RESORTS, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Mar 3, 2011 | Inactive |
| QUAIL CREEK OF VERO, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | May 17, 2012 | Inactive |
| 54 WEST, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Jan 22, 2013 | Inactive |
| OCALA 40, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Oct 1, 2014 | Inactive |
| RITTER POINTE, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Oct 14, 1994 | Inactive |
| BLACKWELL PROPERTIES, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Feb 12, 1998 | Inactive |
| THREE LAKE RV RESORT, INC.New Port Richey, FL · Inactive | New Port Richey, FL | Corporation | Apr 16, 1999 | Inactive |