| ORIENTAL EVERGREEN MASONIC BUILDING CORPORATIONSouth Windsor, CT · Active | South Windsor, CT | Corporation | Jan 24, 1941 | Active |
| KEENEY FOUNDATION, INCORPORATEDSouth Windsor, CT · Active | South Windsor, CT | Corporation | Nov 25, 1946 | Active |
| GRAND LODGE AND SUBORDINATE LODGES OF THE DAUGHTERS OF SCOTIA IN U.S. AND CANADA, INCORPORATEDSouth Windsor, CT · Active | South Windsor, CT | Corporation | Apr 26, 1906 | Active |
| HARTFORD SICK BENEFIT ASSOCIATION, INCORPORATED, THESouth Windsor, CT · Forfeited | South Windsor, CT | Corporation | Jan 4, 1966 | Forfeited |
| HOME BUILDERS & REMODELERS ASSOCIATION OF CONNECTICUT, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Mar 23, 1962 | Active |
| LION'S CLUB OF SOUTH WINDSOR, INCORPORATED, THESouth Windsor, CT · Active | South Windsor, CT | Corporation | Oct 26, 1961 | Active |
| MANCHESTER, CONNECTICUT, CHAPTER OF THE SOCIETY FOR THE PRESERVATION AND ENCOURAGEMENT OF BARBERSHOPSouth Windsor, CT · Active | South Windsor, CT | Corporation | Dec 18, 1963 | Active |
| PATROLMEN'S AND FIREMEN'S ASSOCIATION OF EAST HARTFORD, INCORPORATED, THESouth Windsor, CT · Forfeited | South Windsor, CT | Corporation | May 29, 1939 | Forfeited |
| SOCIETY OF FORTY MEN AND EIGHT HORSES, LOCAL 370, INC., THESouth Windsor, CT · Forfeited | South Windsor, CT | Corporation | Mar 3, 1928 | Forfeited |
| SOUTH WINDSOR CHAMBER OF COMMERCE, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Apr 29, 1968 | Active |
| SOUTH WINDSOR COMMUNITY SERVICE COUNCIL, INC.South Windsor, CT · Forfeited | South Windsor, CT | Corporation | Apr 26, 1977 | Forfeited |
| SOUTH WINDSOR HISTORICAL SOCIETY, INC., THESouth Windsor, CT · Active | South Windsor, CT | Corporation | Mar 5, 1968 | Active |
| SOUTH WINDSOR LAND CONSERVATION TRUST, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Apr 15, 1976 | Active |
| SOUTH WINDSOR LITTLE LEAGUE, INC., THESouth Windsor, CT · Forfeited | South Windsor, CT | Corporation | Jul 8, 1964 | Forfeited |
| SOUTH WINDSOR ROTARY CLUB INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Sep 20, 1965 | Active |
| SOUTH WINDSOR SWIM & TENNIS CLUB, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Jun 24, 1971 | Active |
| THE SOUTH WINDSOR VOLUNTEER FIRE DEPARTMENT, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Jul 13, 1938 | Active |
| SOUTH WINDSOR YOUTH HOCKEY ASSOCIATION, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Oct 13, 1972 | Active |
| KNIGHTS OF COLUMBUS 5779, REV. E.G. ROSENBERGER COUNCIL, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Dec 30, 1968 | Active |
| OUR SAVIOR LUTHERAN CHURCH OF SOUTH WINDSOR, CONNECTICUT, INCORPORATEDSouth Windsor, CT · Active | South Windsor, CT | Corporation | Apr 8, 1959 | Active |
| TEMPLE BETH HILLEL OF SOUTH WINDSOR, INCORPORATEDSouth Windsor, CT · Active | South Windsor, CT | Corporation | Oct 18, 1960 | Active |
| UNITY CHURCH OF HARTFORDSouth Windsor, CT · Active | South Windsor, CT | Corporation | Feb 15, 1951 | Active |
| BARBARA PAUL ENTERPRISES, INC.S. Windsor, CT · Dissolved | S. Windsor, CT | Corporation | Mar 3, 1978 | Dissolved |
| MITCHELL FUEL CO., INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Oct 11, 1977 | Active |
| LAWRENCE J. ANDRUS, D.D.S., P.C.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | Mar 1, 1978 | Dissolved |
| AMERICAN GRAPHIC PRINTING COMPANY, INC.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | Jun 9, 1978 | Dissolved |
| PLUNKETT-WEBSTER, INC. CT.South Windsor, CT · Merged | South Windsor, CT | Corporation | Feb 24, 1976 | Merged |
| PLEASANT VALLEY REALTY INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Sep 15, 1978 | Active |
| WILMAR CONSTRUCTION, INC.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | Sep 18, 1978 | Dissolved |
| AEREX MANUFACTURING, INC.South Windsor, CT · Merged | South Windsor, CT | Corporation | Aug 15, 1958 | Merged |
| C & S DISTRIBUTORS, INCORPORATEDSouth Windsor, CT · Forfeited | South Windsor, CT | Corporation | Apr 2, 1956 | Forfeited |
| OLD CP, INC.South Windsor, CT · Forfeited | South Windsor, CT | Corporation | Dec 8, 1978 | Forfeited |
| HARTFORD PROVISION COMPANY THESouth Windsor, CT · Active | South Windsor, CT | Corporation | Apr 29, 1971 | Active |
| SOUTH WINDSOR AUTO BODY AND SALES, INC.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | Dec 15, 1978 | Dissolved |
| BATCO, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Jan 2, 1979 | Active |
| SCHWARTZ PARKING, INC.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | May 2, 1949 | Dissolved |
| HAROLD M. NEWBERRY AGENCY, INC.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | Jan 9, 1979 | Dissolved |
| PGS BUSINESS ASSOCIATES, INC.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | Mar 14, 1946 | Dissolved |
| HARTFORD CLAMP COMPANY THESouth Windsor, CT · Forfeited | South Windsor, CT | Corporation | Aug 22, 1929 | Forfeited |
| PRESSURE SEALS, INC.South Windsor, CT · Active | South Windsor, CT | Corporation | Feb 22, 1979 | Active |
| ANDY'S OF SIMSBURY, INC.Simsbury, CT · Dissolved | Simsbury, CT | Corporation | Feb 23, 1979 | Dissolved |
| KEYSTONE PAPER & BOX CO., LLCSouth Windsor, CT · Active | South Windsor, CT | LLC | Jan 31, 2023 | Active |
| J. E. SHEPARD COMPANY THESouth Windsor, CT · Active | South Windsor, CT | Corporation | Dec 26, 1946 | Active |
| VANGUARD LIGHTING, INC.South Windsor, CT · Dissolved | South Windsor, CT | Corporation | Jun 25, 1979 | Dissolved |
| SOUTH WINDSOR ARENA, INC.South Windsor, CT · Forfeited | South Windsor, CT | Corporation | Jul 11, 1979 | Forfeited |
| Q.S.A. OPTICAL CO., INC.South Windsor, CT · Merged | South Windsor, CT | Corporation | Nov 30, 1979 | Merged |
| ASTRO MULTI-FORM & SPRING, INCSouth Windsor, CT · Active | South Windsor, CT | Corporation | Dec 31, 1979 | Active |
| SOUTH WINDSOR LAND OWNERS PROTECTIVE ASSOCIATION, INCORPORATED THESouth Windsor, CT · Dissolved | South Windsor, CT | Corporation | Oct 31, 1940 | Dissolved |
| VICENZO COMPANY, INC. THESouth Windsor, CT · Dissolved | South Windsor, CT | Corporation | Jan 2, 1980 | Dissolved |
| GENEEVA MACHINING SERVICES, INC.South Windsor, CT · Forfeited | South Windsor, CT | Corporation | Jan 3, 1980 | Forfeited |