| ENGINE CO. NO. 1, TOWN OF SOUTHINGTON, INC.Southington, CT · Active | Southington, CT | Corporation | Aug 2, 1961 | Active |
| THE LINCOLN COLLEGE OF NEW ENGLAND FOUNDATION, INC.Southington, CT · Dissolved | Southington, CT | Corporation | Feb 16, 1977 | Dissolved |
| KENDALL KNOLLS ASSOCIATION INC.Southington, CT · Active | Southington, CT | Corporation | Aug 6, 1971 | Active |
| KILTONIC POST NO. 72, AMERICAN LEGION INCORPORATEDSouthington, CT · Active | Southington, CT | Corporation | Apr 11, 1929 | Active |
| LEGION REALTY CORPORATION, THESouthington, CT · Active | Southington, CT | Corporation | Apr 10, 1941 | Active |
| LIONS CLUB OF SOUTHINGTON CONNECTICUT, INCORPORATED THESouthington, CT · Active | Southington, CT | Corporation | Mar 15, 1948 | Active |
| MICKEY'S ATHLETIC CLUB, INCORPORATEDSouthington, CT · Active | Southington, CT | Corporation | Jul 27, 1948 | Active |
| MOUNTAIN GROVE CLUB, INCORPORATED, THESouthington, CT · Active | Southington, CT | Corporation | Dec 23, 1957 | Active |
| NUTMEG DEPRESSION GLASS CLUB OF CONNECTICUT, INC.Southington, CT · Dissolved | Southington, CT | Corporation | Mar 12, 1976 | Dissolved |
| LIVING IN SAFE ALTERNATIVES, INC.Southington, CT · Merged | Southington, CT | Corporation | Jun 29, 1972 | Merged |
| ST. PAUL'S HOUSING CORPORATIONSouthington, CT · Active | Southington, CT | Corporation | Jan 28, 1970 | Active |
| SKLE HOLDING COMPANY THESouthington, CT · Active | Southington, CT | Corporation | Feb 6, 1947 | Active |
| SOCIETY MARIA S.S. DEGLI ANGELI, INC.Southington, CT · Dissolved | Southington, CT | Corporation | May 31, 1960 | Dissolved |
| SONS OF ITALY CLUB, INCORPORATED, THESouthington, CT · Active | Southington, CT | Corporation | Mar 12, 1918 | Active |
| SOUTHINGTON AMATEUR RADIO ASSOCIATION, INCORPORATEDSouthington, CT · Active | Southington, CT | Corporation | May 15, 1956 | Active |
| SOUTHINGTON BAND BACKER'S CLUB, INC., THESouthington, CT · Active | Southington, CT | Corporation | Sep 21, 1970 | Active |
| SOUTHINGTON COMMUNITY THEATRE, INCORPORATED, THESouthington, CT · Active | Southington, CT | Corporation | Oct 22, 1957 | Active |
| MARGARET C. GRIFFIN CHILD DEVELOPMENT CENTER OF SOUTHINGTON, INC.Southington, CT · Active | Southington, CT | Corporation | Jun 11, 1973 | Active |
| SOUTHINGTON HISTORICAL SOCIETY, INC.Southington, CT · Active | Southington, CT | Corporation | Jan 28, 1965 | Active |
| SOUTHINGTON LAND CONSERVATION TRUST, INC.Southington, CT · Active | Southington, CT | Corporation | May 14, 1973 | Active |
| SOUTHINGTON MIDGET FOOTBALL ASSOCIATION, INCORPORATED, THESouthington, CT · Active | Southington, CT | Corporation | Sep 18, 1956 | Active |
| SOUTHINGTON POLICE BENEVOLENT ASSOCIATION INCORPORATED, THESouthington, CT · Active | Southington, CT | Corporation | Jan 7, 1955 | Active |
| SOUTHINGTON SPORTSMEN'S ASSO., INC., THESouthington, CT · Active | Southington, CT | Corporation | Dec 20, 1926 | Active |
| THE SOUTHINGTON-CHESHIRE COMMUNITY YMCAS, INC.Southington, CT · Active | Southington, CT | Corporation | May 14, 1928 | Active |
| SPRING LAKE CONDOMINIUM 3, INC.Southington, CT · Active | Southington, CT | Corporation | Aug 30, 1973 | Active |
| VOLUNTEERS IN SERVICE TO EDUCATION IN INDIA, INC.Southington, CT · Active | Southington, CT | Corporation | May 22, 1973 | Active |
| WONX TRIBE BUILDING ASSOCIATION, INC.Southington, CT · Active | Southington, CT | Corporation | Oct 25, 1972 | Active |
| CONNECTICUT SOCCER LEAGUE, INC.Southington, CT · Forfeited | Southington, CT | Corporation | May 4, 1956 | Forfeited |
| CONNECTICUT STATE DENTAL ASSOCIATION, INCORPORATED THESouthington, CT · Active | Southington, CT | Corporation | Jul 23, 1875 | Active |
| PLAINVILLE, CONNECTICUT, CONGREGATION OF JEHOVAH'S WITNESSES, INC.Southington, CT · Active | Southington, CT | Corporation | Dec 10, 1962 | Active |
| PROGRESSIVE SPECIALTY GLASS COMPANY, INC.Southington, CT · Active | Southington, CT | Corporation | Nov 10, 1977 | Active |
| HAIR SHOP, INC. THESouthington, CT · Forfeited | Southington, CT | Corporation | Dec 14, 1977 | Forfeited |
| LEWIS KITCHEN & BATH CENTER, INC.Southington, CT · Active | Southington, CT | Corporation | Dec 23, 1977 | Active |
| J.B.M., INC.Southington, CT · Active | Southington, CT | Corporation | Jan 27, 1978 | Active |
| F. F. SCREW PRODUCTS, INC.Southington, CT · Active | Southington, CT | Corporation | Sep 19, 1977 | Active |
| GENERAL ELECTRICAL POWER SYSTEMS CORP.Southington, CT · Dissolved | Southington, CT | Corporation | Feb 21, 1978 | Dissolved |
| LITHUANIAN ROMAN CATHOLIC PRIESTS' LEAGUE OF AMERICA, INC.Southington, CT · Forfeited | Southington, CT | Corporation | Mar 21, 1973 | Forfeited |
| THRESHOLDS/VOLUNTEERS IN DECISIONAL EDUCATION, INC.Southington, CT · Active | Southington, CT | Corporation | Jan 25, 1978 | Active |
| JOHN L. CEPLENSKI, JR., D.D.S., P.C.Southington, CT · Dissolved | Southington, CT | Corporation | Mar 17, 1978 | Dissolved |
| HOYT MANUFACTURING COMPANY, INC.Southington, CT · Dissolved | Southington, CT | Corporation | Mar 31, 1978 | Dissolved |
| SBB SOUTHINGTON, INC.Southington, CT · Dissolved | Southington, CT | Corporation | Mar 23, 1978 | Dissolved |
| CENTRAL VALLEY CONSTRUCTION, INC.Southington, CT · Forfeited | Southington, CT | Corporation | Apr 13, 1978 | Forfeited |
| AL JOY TIRE SERVICE, INC.Southington, CT · Active | Southington, CT | Corporation | Apr 13, 1978 | Active |
| DUTIL REALTY CORPORATIONSouthington, CT · Dissolved | Southington, CT | Corporation | Aug 30, 1962 | Dissolved |
| ACE APPLIANCE CO., INC.Southington, CT · Dissolved | Southington, CT | Corporation | May 19, 1978 | Dissolved |
| R. D. WOLF, INC.Southington, CT · Active | Southington, CT | Corporation | May 30, 1978 | Active |
| MILLARD METAL SERVICE CENTER, INC.Southington, CT · Revoked | Southington, CT | Corporation | Sep 22, 1975 | Revoked |
| JADEL FARMS, INC.Southington, CT · Forfeited | Southington, CT | Corporation | Dec 18, 1978 | Forfeited |
| JENSEN'S, INC.Southington, CT · Merged | Southington, CT | Corporation | Mar 5, 1930 | Merged |
| DRETTA MFG. CO., INC.Southington, CT · Dissolved | Southington, CT | Corporation | Jan 19, 1979 | Dissolved |