| SPOT-LITE INC.Madison, CT · Active | Madison, CT | Corporation | Sep 9, 1957 | Active |
| STONEHART ASSOCIATES, INC.Madison, CT · Dissolved | Madison, CT | Corporation | Dec 7, 1976 | Dissolved |
| SUMMER HILL NURSERY, INC.Madison, CT · Active | Madison, CT | Corporation | May 25, 1958 | Active |
| 1017 REALTY, INC.Madison, CT · Active | Madison, CT | Corporation | Dec 21, 1971 | Active |
| U S I, INC.Madison, CT · Active | Madison, CT | Corporation | May 14, 1975 | Active |
| DONALD L. ZABEL, P.C.Madison, CT · Forfeited | Madison, CT | Corporation | Jan 30, 1976 | Forfeited |
| WIRE JOURNAL, INC. THEMadison, CT · Active | Madison, CT | Corporation | Dec 8, 1966 | Active |
| YARDLEY ENTERPRISES, INC.Madison, CT · Dissolved | Madison, CT | Corporation | Jun 30, 1971 | Dissolved |
| NAVIGATORS, INC., THEMadison, CT · Active | Madison, CT | Corporation | Dec 23, 1974 | Active |
| BALDWIN YACHT CLUB, INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | Jul 28, 1948 | Active |
| BARBERRY FARMS ASSOCIATION, INCORPORATEDMadison, CT · Active | Madison, CT | Corporation | Aug 27, 1948 | Active |
| COUNTRY SCHOOL INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | Jul 11, 1955 | Active |
| EAST RIVER LIBRARY COMPANYMadison, CT · Dissolved | Madison, CT | Corporation | Oct 23, 1876 | Dissolved |
| GARNET PARK CIVIC ASSOCIATION, INC.Madison, CT · Active | Madison, CT | Corporation | Sep 5, 1962 | Active |
| MADISON ROTARY FOUNDATION, INC.Madison, CT · Forfeited | Madison, CT | Corporation | Apr 24, 1963 | Forfeited |
| MAGUIRE FOUNDATION, INCORPORATED THEMadison, CT · Forfeited | Madison, CT | Corporation | Dec 5, 1947 | Forfeited |
| WIEGAND MEMORIAL FOUNDATION, INC., THEMadison, CT · Active | Madison, CT | Corporation | Mar 8, 1956 | Active |
| WIRE FOUNDATION, INC., THEMadison, CT · Active | Madison, CT | Corporation | Mar 15, 1973 | Active |
| GRISWOLD POST NO. 79 AMERICAN LEGION, INCORPORATEDMadison, CT · Active | Madison, CT | Corporation | May 7, 1930 | Active |
| HAMMONASSETT FISHING ASSOCIATION THEMadison, CT · Active | Madison, CT | Corporation | Apr 18, 1888 | Active |
| HIGHLANDS EAST RIVER CIVIC CORPORATION, INCORPORATED THEMadison, CT · Active | Madison, CT | Corporation | Jul 18, 1944 | Active |
| HOUSATONIC FLY FISHERMEN'S ASSOCIATION, INC.Madison, CT · Forfeited | Madison, CT | Corporation | Feb 13, 1969 | Forfeited |
| KELSEY PLACE BEACH ASSOCIATION, INCORPORATEDMadison, CT · Active | Madison, CT | Corporation | Aug 31, 1954 | Active |
| KELSEY PLACE REALTY ASSOCIATION, INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | May 24, 1960 | Active |
| MADISON ABC PROGRAM, INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | Jul 7, 1969 | Active |
| MADISON CHAMBER OF COMMERCE, INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | Feb 14, 1972 | Active |
| MADISON GRANGE NO. 120. POF H. INCORPORATED THEMadison, CT · Dissolved | Madison, CT | Corporation | Feb 14, 1946 | Dissolved |
| MADISON HISTORICAL SOCIETY, INCORPORATED THEMadison, CT · Active | Madison, CT | Corporation | Sep 18, 1919 | Active |
| MADISON HOSE COMPANY NUMBER ONE, INCORPORATEDMadison, CT · Active | Madison, CT | Corporation | Jan 16, 1920 | Active |
| MADISON INTERFAITH RESIDENTIAL COMMUNITY, INC.Madison, CT · Active | Madison, CT | Corporation | May 6, 1975 | Active |
| MADISON LAKES ASSOCIATION, INC.Madison, CT · Active | Madison, CT | Corporation | May 17, 1965 | Active |
| MADISON LAND CONSERVATION TRUST, INC.Madison, CT · Active | Madison, CT | Corporation | Jan 28, 1964 | Active |
| MADISON MASONIC TEMPLE CORPORATIONMadison, CT · Active | Madison, CT | Corporation | Feb 21, 1966 | Active |
| MADISON POST NO. 2096, VETERANS OF FOREIGN WARS OF THE UNITED STATES, INC.Madison, CT · Active | Madison, CT | Corporation | Oct 7, 1957 | Active |
| MADISON WINTER CLUB INCORPORATED, THEMadison, CT · Dissolved | Madison, CT | Corporation | Dec 2, 1939 | Dissolved |
| NEW HAVEN CHAPTER NO. 1 OF SPEBSQSA,INCORPORATED THEMadison, CT · Dissolved | Madison, CT | Corporation | May 10, 1948 | Dissolved |
| CAMP LAURELWOOD, INCORPORATEDMadison, CT · Active | Madison, CT | Corporation | Apr 28, 1937 | Active |
| NEWCOMER'S CLUB OF MADISON CONNECTICUT, INC., THEMadison, CT · Active | Madison, CT | Corporation | Sep 10, 1975 | Active |
| NORTH MADISON VOLUNTARY FIRE COMPANY, INC., THEMadison, CT · Active | Madison, CT | Corporation | Apr 5, 1934 | Active |
| OVERSHORE ASSOCIATION INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | Jun 26, 1941 | Active |
| PLEASANT VIEW ASSOCIATION, INC.Madison, CT · Active | Madison, CT | Corporation | Jun 14, 1966 | Active |
| SEAVIEW BEACH ASSOCIATION, INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | Aug 6, 1946 | Active |
| SHORE LANDS ASSOCIATION, INCORPORATED, THEMadison, CT · Active | Madison, CT | Corporation | Dec 5, 1949 | Active |
| WATERBURY AVENUE ASSOCIATION, INCORPORATEDMadison, CT · Active | Madison, CT | Corporation | Aug 12, 1952 | Active |
| MADISON JAYCEES, INC.Madison, CT · Active | Madison, CT | Corporation | Jul 18, 1955 | Active |
| NEW HAVEN CHORALE, INC.Madison, CT · Active | Madison, CT | Corporation | Nov 29, 1950 | Active |
| STONELEIGH ASSOCIATION, INCORPORATEDMadison, CT · Active | Madison, CT | Corporation | Apr 4, 1956 | Active |
| JACQUES PEPIN, INC.Madison, CT · Active | Madison, CT | Corporation | Sep 27, 1977 | Active |
| DONALD B. WEEKS, D.M.D., P.C.Madison, CT · Dissolved | Madison, CT | Corporation | Nov 3, 1969 | Dissolved |
| ULTRA CLEAN EQUIPMENT, INCMadison, CT · Active | Madison, CT | Corporation | Oct 5, 1977 | Active |