| MIDDLETOWN POWER SQUADRON, INC.Middletown, CT · Active | Middletown, CT | Corporation | Jul 12, 1956 | Active |
| MIDDLETOWN RIFLE AND REVOLVER CLUB, INCORPORATED THEMiddletown, CT · Active | Middletown, CT | Corporation | May 14, 1943 | Active |
| MIDDLETOWN ROTARY CLUB, INC.Middletown, CT · Active | Middletown, CT | Corporation | Jun 23, 1964 | Active |
| NEW ENGLAND DISTRICT OF CIVITAN INTERNATIONAL, INC., THEMiddletown, CT · Dissolved | Middletown, CT | Corporation | Jun 7, 1974 | Dissolved |
| THE POLISH KNIGHTS AUXILIARY,INCORPORATEDMiddletown, CT · Forfeited | Middletown, CT | Corporation | May 8, 1950 | Forfeited |
| POLISH NATIONAL HOME CORPORATION OF MIDDLETOWN, CONN., INCORPORATED, THEMiddletown, CT · Dissolved | Middletown, CT | Corporation | Aug 9, 1940 | Dissolved |
| PRINCE HALL ACRES, INCORPORATEDMiddletown, CT · Active | Middletown, CT | Corporation | Jun 5, 1967 | Active |
| ROCKFALL FOUNDATION, INC.Middletown, CT · Active | Middletown, CT | Corporation | Jan 17, 1935 | Active |
| RUTH E. LAWRENCE FUND, INC., THEMiddletown, CT · Active | Middletown, CT | Corporation | Apr 3, 1959 | Active |
| RIDGELY CONDOMINIUM ASSOCIATION NO ONE, INC.Middletown, CT · Active | Middletown, CT | Corporation | Mar 26, 1974 | Active |
| CENTER FOR EDUCATIONAL ACTION, INC. THEMiddletown, CT · Forfeited | Middletown, CT | Corporation | Aug 20, 1971 | Forfeited |
| DAUGHTERS OF OUR LADY OF THE GARDEN, INCORPORATEDMiddletown, CT · Active | Middletown, CT | Corporation | Sep 8, 1969 | Active |
| SOCIETY OF THE POLISH KNIGHTS UNDER THE PROTECTION OF THE QUEEN OF THE POLISH CROWN, INCORPORATED, TMiddletown, CT · Dissolved | Middletown, CT | Corporation | Jul 20, 1923 | Dissolved |
| WESLEYAN POTTERS, INCORPORATEDMiddletown, CT · Active | Middletown, CT | Corporation | Sep 18, 1967 | Active |
| WESTFIELD GRANGE NO. 50 INCORPORATEDMiddletown, CT · Dissolved | Middletown, CT | Corporation | Dec 8, 1920 | Dissolved |
| MARION K. SCHULTZ AND STEPHEN E. WITKOWSKI MEMORIAL CANCER FUND, INC. THEMiddletown, CT · Forfeited | Middletown, CT | Corporation | Feb 17, 1969 | Forfeited |
| MILARDO-WILCOX POST NO. 75, AMERICAN LEGION, INCORPORATEDMiddletown, CT · Active | Middletown, CT | Corporation | May 6, 1933 | Active |
| POLISH FALCONS OF AMERICA NEST 519, INCORPORATED THEMiddletown, CT · Active | Middletown, CT | Corporation | Sep 27, 1924 | Active |
| NORTH CONGREGATION OF JEHOVAH'S WITNESSES, MIDDLETOWN, CONNECTICUT, INC.East Middletown, CT · Active | East Middletown, CT | Corporation | Mar 26, 1956 | Active |
| CONNECTICUT LEGAL SERVICES, INC.Middletown, CT · Active | Middletown, CT | Corporation | Mar 17, 1977 | Active |
| LYMAN PRODUCTS CORPORATIONMiddletown, CT · Active | Middletown, CT | Corporation | Sep 19, 1977 | Active |
| BISH ELECTRIC, INC.Middletown, CT · Forfeited | Middletown, CT | Corporation | Dec 2, 1977 | Forfeited |
| CONNECTICUT COALITION AGAINST DOMESTIC VIOLENCE, INC.Middletown, CT · Active | Middletown, CT | Corporation | Jan 31, 1978 | Active |
| ENVIRONMENTAL SCIENCE CORPORATIONMiddletown, CT · Forfeited | Middletown, CT | Corporation | Mar 3, 1978 | Forfeited |
| JUKONSKI TRUCK SALES AND SERVICE, LTD.Middletown, CT · Active | Middletown, CT | Corporation | Mar 10, 1978 | Active |
| CENTRAL CONNECTICUT PAINTING CO., INC.Middletown, CT · Dissolved | Middletown, CT | Corporation | Mar 15, 1978 | Dissolved |
| TRIGO, INC.Middletown, CT · Forfeited | Middletown, CT | Corporation | Aug 22, 1977 | Forfeited |
| CONNECTICUT LIBRARY CONSORTIUM, INC.Middletown, CT · Active | Middletown, CT | Corporation | Mar 3, 1978 | Active |
| ODDFELLOWS PLAYHOUSE, INC.Middletown, CT · Active | Middletown, CT | Corporation | May 12, 1978 | Active |
| D. J. DUNHAM JEWELERS INC.Middletown, CT · Forfeited | Middletown, CT | Corporation | May 23, 1978 | Forfeited |
| COMMUNITY HEALTH CENTER, INCORPORATEDMiddletown, CT · Active | Middletown, CT | Corporation | Mar 26, 1973 | Active |
| BERTZ DESIGN GROUP, INC.Middletown, CT · Dissolved | Middletown, CT | Corporation | Jun 1, 1978 | Dissolved |
| BIEGA FUNERAL HOME,INCORPORATEDMiddletown, CT · Active | Middletown, CT | Corporation | Mar 17, 1948 | Active |
| DIANA, INC.Middletown, CT · Dissolved | Middletown, CT | Corporation | Jun 26, 1978 | Dissolved |
| MIDDLETOWN CVS, INC.Middletown, CT · Merged | Middletown, CT | Corporation | Jul 17, 1978 | Merged |
| AEROSPACE TECHNIQUES, INC.Middletown, CT · Active | Middletown, CT | Corporation | Sep 14, 1965 | Active |
| BRIGGS CORPORATION THEMiddletown, CT · Dissolved | Middletown, CT | Corporation | Dec 15, 1959 | Dissolved |
| PLASTIC DESIGN INTERNATIONAL, INC.Middletown, CT · Active | Middletown, CT | Corporation | Nov 6, 1978 | Active |
| MIDDLESEX EYE PHYSICIANS, P.C.Middletown, CT · Active | Middletown, CT | Corporation | Nov 13, 1978 | Active |
| MBR CORPORATIONMiddletown, CT · Forfeited | Middletown, CT | Corporation | Nov 17, 1978 | Forfeited |
| PAINT SPOT, INC. THEMiddletown, CT · Dissolved | Middletown, CT | Corporation | Nov 24, 1978 | Dissolved |
| GRANGE BUILDING COMPANY, INCORPORATED THEMiddletown, CT · Dissolved | Middletown, CT | Corporation | Jun 28, 1882 | Dissolved |
| PETER H. MORTENSEN-VINCI COMPANY THEMiddletown, CT · Active | Middletown, CT | Corporation | Jul 30, 1965 | Active |
| MERRIAM MANUFACTURING COMPANYMiddletown, CT · Forfeited | Middletown, CT | Corporation | Apr 12, 1851 | Forfeited |
| NATUREMOST OF NEW ENGLAND, INC.Middletown, CT · Forfeited | Middletown, CT | Corporation | Aug 22, 1977 | Forfeited |
| BIDWELL INDUSTRIAL GROUP, INC.Middletown, CT · Active | Middletown, CT | Corporation | Jul 7, 1969 | Active |
| JARVIS PRODUCTS CORPORATIONMiddletown, CT · Active | Middletown, CT | Corporation | Jun 1, 1956 | Active |
| E-B MANUFACTURING COMPANY, INC.Middletown, CT · Active | Middletown, CT | Corporation | Feb 1, 1979 | Active |
| SCOTRICK CORPORATIONMiddletown, CT · Dissolved | Middletown, CT | Corporation | Jun 17, 1969 | Dissolved |
| MOUNT HOPE F.B.H. CHURCH OF GOD OF AMERICA, INCORPORATEDMiddletown, CT · Dissolved | Middletown, CT | Corporation | Feb 13, 1979 | Dissolved |