| GIANTS NECK IMPROVEMENT CLUB,INC., THENiantic, CT · Active | Niantic, CT | Corporation | Dec 21, 1953 | Active |
| KARI-HILL POST NO. 5849 VETERANS OF FOREIGN WARS, INCORPORATED THENiantic, CT · Active | Niantic, CT | Corporation | Jan 23, 1947 | Active |
| LADIES AID SOCIETY INCORPORATEDNiantic, CT · Active | Niantic, CT | Corporation | May 6, 1912 | Active |
| LIONS CLUB OF NIANTIC, INCORPORATED THENiantic, CT · Active | Niantic, CT | Corporation | Jun 6, 1950 | Active |
| THE MERIDEN SKI AND SNOWBOARD CLUB, INCORPORATEDNiantic, CT · Active | Niantic, CT | Corporation | Mar 9, 1964 | Active |
| NIANTIC BAY YACHT CLUB, INCORPORATEDNiantic, CT · Active | Niantic, CT | Corporation | May 20, 1940 | Active |
| NIANTIC FIRE DEPARTMENT, INCORPORATED, THENiantic, CT · Active | Niantic, CT | Corporation | Nov 2, 1923 | Active |
| OSWEGATCHIE HILLS CLUB, INCORPORATEDNiantic, CT · Active | Niantic, CT | Corporation | Sep 27, 1934 | Active |
| PARTICULAR COUNCIL, SOCIETY OF ST. VINCENT DE PAUL OF HARTFORD, INC.Niantic, CT · Active | Niantic, CT | Corporation | May 5, 1920 | Active |
| SAUNDERS POINT ASSOCIATION, INC., THENiantic, CT · Active | Niantic, CT | Corporation | Dec 6, 1960 | Active |
| SEAKAY, INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Jul 1, 1965 | Dissolved |
| THAMES YACHT CLUB, INCORPORATED, THENiantic, CT · Active | Niantic, CT | Corporation | May 23, 1933 | Active |
| TURNER-TINKER POST 128, AMERICAN LEGION, INC.Niantic, CT · Active | Niantic, CT | Corporation | Oct 28, 1971 | Active |
| WATERFORD LAND TRUST, INC.Niantic, CT · Active | Niantic, CT | Corporation | Dec 7, 1973 | Active |
| THE GORTON LAKE SHORES ASSOCIATION, INCORPORATEDNiantic, CT · Active | Niantic, CT | Corporation | Jan 24, 1956 | Active |
| OLD BLACK POINT ASSOCIATION, INCORPORATED THENiantic, CT · Active | Niantic, CT | Corporation | May 24, 1941 | Active |
| GRAND BEVERAGE ENTERPRISES, INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Nov 7, 1977 | Dissolved |
| STANTON I. REVZON & CO.Niantic, CT · Dissolved | Niantic, CT | Corporation | Oct 3, 1977 | Dissolved |
| J & B TACKLE CO.Niantic, CT · Active | Niantic, CT | Corporation | Mar 2, 1978 | Active |
| KASEY, INC.Niantic, CT · Forfeited | Niantic, CT | Corporation | Apr 6, 1978 | Forfeited |
| NIANTIC CINEMA CORP.Niantic, CT · Forfeited | Niantic, CT | Corporation | Sep 20, 1978 | Forfeited |
| NIANTIC PLUMBING AND APPLIANCE COMPANY, INCORPORATED THENiantic, CT · Active | Niantic, CT | Corporation | Mar 24, 1952 | Active |
| J. ROBERT PFANNER ASSOCIATES, P.C.Niantic, CT · Active | Niantic, CT | Corporation | Sep 4, 1979 | Active |
| GUTTERMAN, INC. THENiantic, CT · Forfeited | Niantic, CT | Corporation | Feb 26, 1980 | Forfeited |
| HUTCHINS AND SONS,INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Mar 4, 1980 | Dissolved |
| FRIENDS OF BROOKSIDE FARM MUSEUM, INC.Niantic, CT · Active | Niantic, CT | Corporation | Mar 17, 1980 | Active |
| PERSONNEL CORPORATION OF AMERICANiantic, CT · Forfeited | Niantic, CT | Corporation | Apr 10, 1980 | Forfeited |
| SMITH'S PHARMACY, INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Jul 25, 1980 | Dissolved |
| NIANTIC DENTAL ASSOCIATES, P.C.Niantic, CT · Active | Niantic, CT | Corporation | Oct 21, 1980 | Active |
| DAVIS BEACH CORPORATIONNiantic, CT · Active | Niantic, CT | Corporation | Jan 26, 1973 | Active |
| RENT-A-TECH, INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Jan 20, 1981 | Dissolved |
| GIULIANO'S BAKERY, INC.Niantic, CT · Active | Niantic, CT | Corporation | Feb 3, 1981 | Active |
| NIANTIC RIVER TRANSMISSION CO., INCNiantic, CT · Active | Niantic, CT | Corporation | Aug 20, 1981 | Active |
| JAMMAR MFG. CO. INC.Niantic, CT · Active | Niantic, CT | Corporation | Sep 4, 1981 | Active |
| AERO TURBINE INTERNATIONAL, INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Oct 1, 1981 | Dissolved |
| CONNECTICUT SOCIETY OF ASSOCIATION EXECUTIVES, INC.Niantic, CT · Active | Niantic, CT | Corporation | Feb 16, 1982 | Active |
| EAST LYME POLICE BENEVOLENT ASSOCIATION, INC.Niantic, CT · Active | Niantic, CT | Corporation | Mar 19, 1982 | Active |
| STRUCTURED TECHNOLOGY CORPORATIONNiantic, CT · Forfeited | Niantic, CT | Corporation | Jun 8, 1982 | Forfeited |
| NIANTIC TOOL, INC.Niantic, CT · Active | Niantic, CT | Corporation | Jun 8, 1982 | Active |
| ERA ENTERPRISES, INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Oct 27, 1982 | Dissolved |
| HMS PUBLICATIONS, INC.Niantic, CT · Dissolved | Niantic, CT | Corporation | Mar 16, 1983 | Dissolved |
| CREATIONS, INCORPORATEDNiantic, CT · Active | Niantic, CT | Corporation | May 3, 1983 | Active |
| TELAID INDUSTRIES, INC.Niantic, CT · Active | Niantic, CT | Corporation | Jun 30, 1983 | Active |
| DEVLIN & HALE ASSOCIATES, INC.Niantic, CT · Active | Niantic, CT | Corporation | Jul 6, 1983 | Active |
| BROOKFIELD ESTATES CONDOMINIUM ASSOCIATION, INC.Niantic, CT · Active | Niantic, CT | Corporation | Dec 6, 1983 | Active |
| BRIARWOOD ESTATES OWNERS ASSOCIATION, INC.Niantic, CT · Active | Niantic, CT | Corporation | Dec 23, 1983 | Active |
| SPECTRUM CONSTRUCTION COMPANYNiantic, CT · Dissolved | Niantic, CT | Corporation | Dec 30, 1983 | Dissolved |
| PEQUOT CYCLISTS, INC.Niantic, CT · Active | Niantic, CT | Corporation | Feb 29, 1984 | Active |
| JLK LIQUIDATION CORP.Niantic, CT · Dissolved | Niantic, CT | Corporation | Apr 11, 1984 | Dissolved |
| CARPENTERI CORPORATIONNiantic, CT · Forfeited | Niantic, CT | Corporation | Dec 27, 1984 | Forfeited |