| THE SASQUANAUG CONSERVANCY FOR SOUTHPORT, INC.Southport, CT · Active | Southport, CT | Corporation | Dec 8, 1897 | Active |
| PEQUOT YACHT CLUB INCORPORATEDSouthport, CT · Active | Southport, CT | Corporation | Apr 25, 1925 | Active |
| FAIRFIELD WOMAN'S CLUB, INC. THESouthport, CT · Dissolved | Southport, CT | Corporation | Mar 17, 1978 | Dissolved |
| C. O. JELLIFF CORPORATIONSouthport, CT · Active | Southport, CT | Corporation | Oct 6, 1902 | Active |
| UKRAINIAN SICK BENEFIT SOCIETY, INCORPORATEDSouthport, CT · Active | Southport, CT | Corporation | Jun 20, 1944 | Active |
| THE SUPERIOR PLATING COMPANYSouthport, CT · Active | Southport, CT | Corporation | Jan 12, 1954 | Active |
| 176 MAIN STREET ASSOCIATION, INC.Southport, CT · Active | Southport, CT | Corporation | Dec 11, 1979 | Active |
| FRIENDS OF THE BARNUM MUSEUM, INC.Southport, CT · Forfeited | Southport, CT | Corporation | Apr 15, 1980 | Forfeited |
| DAWSON CAPITAL MANAGEMENT, INC.Southport, CT · Dissolved | Southport, CT | Corporation | Jan 16, 1981 | Dissolved |
| GUNSMITHING LTD.Southport, CT · Active | Southport, CT | Corporation | Jan 29, 1981 | Active |
| REALDATA, INC.Southport, CT · Active | Southport, CT | Corporation | May 21, 1981 | Active |
| SOUTHPORT CONSERVANCY, INC.Southport, CT · Merged | Southport, CT | Corporation | Feb 23, 1982 | Merged |
| EPW, INC.Southport, CT · Forfeited | Southport, CT | Corporation | Apr 30, 1982 | Forfeited |
| SOUTHPORT GULF, INC.Southport, CT · Active | Southport, CT | Corporation | Jun 16, 1982 | Active |
| DISCOVERY SYSTEMS, INC.Southport, CT · Active | Southport, CT | Corporation | Aug 24, 1982 | Active |
| SOUTHPORT HARBOR CONDOMINIUM ASSOCIATION, INC.Southport, CT · Active | Southport, CT | Corporation | Sep 8, 1982 | Active |
| O'NEILL ENTERPRISES, INC.Southport, CT · Active | Southport, CT | Corporation | Nov 9, 1982 | Active |
| LUPARIELLO'S DRUG STORE, INC.Southport, CT · Dissolved | Southport, CT | Corporation | Dec 2, 1983 | Dissolved |
| JOHN DESMOND BUILDERS, INC.Southport, CT · Active | Southport, CT | Corporation | Feb 7, 1984 | Active |
| SOUND ELECTRONICS, INC.Southport, CT · Dissolved | Southport, CT | Corporation | Oct 9, 1984 | Dissolved |
| BRODY WILKINSON PCSouthport, CT · Active | Southport, CT | Corporation | Nov 7, 1984 | Active |
| UNCOMMON MARKET, LTD. THESouthport, CT · Forfeited | Southport, CT | Corporation | Mar 13, 1985 | Forfeited |
| GERARD HUERTA DESIGN, INC.Southport, CT · Dissolved | Southport, CT | Corporation | Mar 22, 1985 | Dissolved |
| THE SOUTHPORT SCHOOL, INC.Southport, CT · Active | Southport, CT | Corporation | May 28, 1985 | Active |
| OPEL MARKETING, INCORPORATEDSouthport, CT · Dissolved | Southport, CT | Corporation | Oct 10, 1985 | Dissolved |
| VOSE FOUNDATION, INC. THESouthport, CT · Active | Southport, CT | Corporation | Dec 17, 1985 | Active |
| SOUTHPORT SEWER & SEPTIC SPECIALISTS INC.Southport, CT · Forfeited | Southport, CT | Corporation | Apr 17, 1986 | Forfeited |
| SOUTHPORT ATHLETIC CLUB, INC.Southport, CT · Dissolved | Southport, CT | Corporation | May 1, 1986 | Dissolved |
| CEIL TOMPKINS INCSouthport, CT · Dissolved | Southport, CT | Corporation | Sep 19, 1986 | Dissolved |
| SOUTHPORT RIDGE HOMEOWNERS ASSOCIATION, INC.Southport, CT · Active | Southport, CT | Corporation | Nov 6, 1986 | Active |
| RIGGS GRAPHICS, LTD.Southport, CT · Forfeited | Southport, CT | Corporation | Dec 23, 1986 | Forfeited |
| PAPPAS MACDONNELL, INC.Southport, CT · Active | Southport, CT | Corporation | Jan 6, 1987 | Active |
| CARTER CAPITAL CORPORATIONSouthport, CT · Active | Southport, CT | Corporation | Aug 6, 1987 | Active |
| CHEMHOLD, INC.Southport, CT · Dissolved | Southport, CT | Corporation | Nov 20, 1987 | Dissolved |
| FAIRFIELD GLASS SERVICE, INC.Southport, CT · Active | Southport, CT | Corporation | Feb 17, 1988 | Active |
| TOTAL LOOK OF SOUTHPORT INC. THESouthport, CT · Active | Southport, CT | Corporation | Apr 21, 1988 | Active |
| J. P. FRANZEN ASSOCIATES ARCHITECTS, P.C.Southport, CT · Active | Southport, CT | Corporation | Jun 10, 1988 | Active |
| FAIRFIELD 2000 HOMES CORPORATIONSouthport, CT · Forfeited | Southport, CT | Corporation | Jul 7, 1988 | Forfeited |
| KASSON JEWELERS, INC.Southport, CT · Active | Southport, CT | Corporation | Nov 4, 1988 | Active |
| CHARTER RESEARCH AND INVESTMENT GROUP, INC.Southport, CT · Active | Southport, CT | Corporation | Nov 16, 1988 | Active |
| RAKASEDER ASSOCIATES, INC.New Canaan, CT · Dissolved | New Canaan, CT | Corporation | Mar 13, 1989 | Dissolved |
| LUXETRON TECHNOLOGIES INC.Southport, CT · Withdrawn | Southport, CT | Corporation | Apr 28, 1989 | Withdrawn |
| GREENWICH INTERNATIONAL DEVELOPMENTS, LTD.Southport, CT · Forfeited | Southport, CT | Corporation | Sep 22, 1989 | Forfeited |
| TALLMAN BUILDING COMPANY, INC.Southport, CT · Active | Southport, CT | Corporation | Jan 4, 1990 | Active |
| CARTER, MORSE & GOODRICH, INC.Southport, CT · Active | Southport, CT | Corporation | Feb 7, 1990 | Active |
| SBE CO., INC.Southport, CT · Forfeited | Southport, CT | Corporation | May 7, 1990 | Forfeited |
| STRATEGIC APPLICATION SYSTEMS, INC.Southport, CT · Active | Southport, CT | Corporation | May 18, 1990 | Active |
| SOUND, INC.Southport, CT · Active | Southport, CT | Corporation | May 30, 1990 | Active |
| ROBBIE DE VILLIERS DESIGN INC.Southport, CT · Dissolved | Southport, CT | Corporation | May 16, 1990 | Dissolved |
| AMAZING CAR RENTAL, INC.Southport, CT · Dissolved | Southport, CT | Corporation | Aug 2, 1990 | Dissolved |