| YANKEE INVESTORS OF CONNECTICUT, INC.North Haven, CT · Dissolved | North Haven, CT | Corporation | Jul 19, 1960 | Dissolved |
| BENHAVEN, INC.North Haven, CT · Active | North Haven, CT | Corporation | May 19, 1967 | Active |
| BETSY ROSS NURSERY SCHOOL, INC., THENorth Haven, CT · Forfeited | North Haven, CT | Corporation | Jun 9, 1955 | Forfeited |
| CENTER FOR EDUCATIONAL RESOURCES AND LABORATORY FOR ADVANCED STUDIES, INC., THENorth Haven, CT · Forfeited | North Haven, CT | Corporation | Apr 14, 1976 | Forfeited |
| AMERICAN COUNCIL OF ENGINEERING COMPANIES OF CONNECTICUT, INC.North Haven, CT · Active | North Haven, CT | Corporation | Feb 24, 1969 | Active |
| CONNECTICUT LEAGUE FOR NURSING INCORPORATED, THENorth Haven, CT · Merged | North Haven, CT | Corporation | Jun 11, 1958 | Merged |
| CONNECTICUT SOCIETY OF PROFESSIONAL ENGINEERS, INC., THENorth Haven, CT · Active | North Haven, CT | Corporation | Jun 3, 1971 | Active |
| CONNECTICUT STATE SOCIETY OF ANESTHESIOLOGISTS, INCORPORATEDNew Haven, CT · Active | New Haven, CT | Corporation | Dec 18, 1968 | Active |
| COOPER ROAD COMMUNITY, INCORPORATEDNorth Haven, CT · Active | North Haven, CT | Corporation | Apr 28, 1961 | Active |
| CORINTHIAN TEMPLE BUILDING ASSOCIATION, INC.North Haven, CT · Active | North Haven, CT | Corporation | Oct 1, 1945 | Active |
| ELDERLY HOUSING MANAGEMENT, INC.North Haven, CT · Active | North Haven, CT | Corporation | Apr 10, 1975 | Active |
| ELIZABETH IVES SCHOOL FOR SPECIAL CHILDREN, INC.North Haven, CT · Active | North Haven, CT | Corporation | Apr 9, 1965 | Active |
| ELM CITY KENNEL CLUB, INCORPORATEDNorth Haven, CT · Active | North Haven, CT | Corporation | Dec 13, 1918 | Active |
| AGAPE, INC.North Haven, CT · Dissolved | North Haven, CT | Corporation | Jul 29, 1974 | Dissolved |
| FAIR HAVEN TEMPLE BUILDING ASSOCIATION, INCORPORATEDNorth Haven, CT · Dissolved | North Haven, CT | Corporation | Jul 31, 1919 | Dissolved |
| GREATER NEW HAVEN NEW CAR DEALERS ASSOCIATION, INC., THENorth Haven, CT · Forfeited | North Haven, CT | Corporation | Feb 25, 1966 | Forfeited |
| HARTFORD COUNTY MEDICAL ASSOCIATION, INCORPORATED, THENorth Haven, CT · Active | North Haven, CT | Corporation | Apr 16, 1953 | Active |
| HIGH LANE CLUB, INCORPORATED, THENorth Haven, CT · Active | North Haven, CT | Corporation | Jun 27, 1939 | Active |
| THE LIONS CLUB OF HAMDEN, INCORPORATEDNorth Have, CT · Active | North Have, CT | Corporation | Mar 2, 1951 | Active |
| LITCHFIELD COUNTY MEDICAL ASSOCIATION, INCORPORATED, THENorth Haven, CT · Active | North Haven, CT | Corporation | Apr 15, 1953 | Active |
| COMMUNITY HOUSING MANAGEMENT, INC.North Haven, CT · Dissolved | North Haven, CT | Corporation | May 29, 1974 | Dissolved |
| MAX SINOWAY BASEBALL LEAGUE, INC.North Haven, CT · Active | North Haven, CT | Corporation | Mar 4, 1976 | Active |
| NEW HAVEN COUNTY EXTENSION RESOURCE COUNCIL, INC.North Haven, CT · Active | North Haven, CT | Corporation | Feb 20, 1958 | Active |
| NEW HAVEN LODGE NO. 25 BENEVOLENT AND PROTECTIVE ORDER OF ELKS OF THE UNITED STATES OF AMERICANorth Haven, CT · Active | North Haven, CT | Corporation | Oct 13, 1903 | Active |
| NEW HAVEN PHILATELIC SOCIETY, INCORPORATEDNorth Haven, CT · Active | North Haven, CT | Corporation | Oct 15, 1965 | Active |
| NEW SAMARITAN CORPORATIONNorth Haven, CT · Active | North Haven, CT | Corporation | Jan 29, 1970 | Active |
| NORTH HAVEN COLUMBUS CLUB, INCORPORATED, THENorth Haven, CT · Active | North Haven, CT | Corporation | Oct 10, 1957 | Active |
| NORTH HAVEN FAIR ASSOCIATION, INCORPORATED THENorth Haven, CT · Active | North Haven, CT | Corporation | Jul 2, 1943 | Active |
| NORTH HAVEN INTERFAITH HOUSING, INC.North Haven, CT · Active | North Haven, CT | Corporation | May 7, 1973 | Active |
| NORTH HAVEN LAND TRUST, INC.North Haven, CT · Active | North Haven, CT | Corporation | Sep 11, 1972 | Active |
| NORTH HAVEN SKI CLUB, INC.Hamden, CT · Forfeited | Hamden, CT | Corporation | Jun 11, 1971 | Forfeited |
| POLISH ARMY VETERANS ASSOCIATION OF AMERICA, POST NO. 98. INCORPORATEDNorth Haven, CT · Forfeited | North Haven, CT | Corporation | Dec 7, 1932 | Forfeited |
| PRIHILLIAN CLUB CO.North Haven, CT · Forfeited | North Haven, CT | Corporation | May 8, 1962 | Forfeited |
| RED HAWKS ATHLETIC CLUB INCORPORATED, THENorth Haven, CT · Dissolved | North Haven, CT | Corporation | Jan 10, 1927 | Dissolved |
| RIDGE TOP CLUB, INCORPORATEDNorth Haven, CT · Active | North Haven, CT | Corporation | Jul 1, 1957 | Active |
| AGENCY ON AGING OF SOUTH CENTRAL CONNECTICUT, INC.North Haven, CT · Active | North Haven, CT | Corporation | Jun 10, 1974 | Active |
| TRES DIAS OF FAIRFIELD COUNTY, INC.North Haven, CT · Dissolved | North Haven, CT | Corporation | Nov 30, 1976 | Dissolved |
| THE WEST RIDGE VOLUNTEER FIRE ASSOCIATION, INCORPORATEDNorth Haven, CT · Active | North Haven, CT | Corporation | Oct 6, 1950 | Active |
| ARC OF GREATER NEW HAVEN, INC.North Haven, CT · Active | North Haven, CT | Corporation | Feb 13, 1952 | Active |
| GIRL SCOUTS OF CONNECTICUT, INC.North Haven, CT · Active | North Haven, CT | Corporation | Apr 2, 1940 | Active |
| NORTH HAVEN HISTORICAL SOCIETY & MUSEUMS, INC.North Haven, CT · Active | North Haven, CT | Corporation | Jun 13, 1957 | Active |
| BRESCOME BARTON INC.North Haven, CT · Active | North Haven, CT | Corporation | Jul 22, 1936 | Active |
| HE AND SHE CLOTHING CO., INC.North Haven, CT · Dissolved | North Haven, CT | Corporation | Oct 11, 1977 | Dissolved |
| D. S. DAVIDSON COMPANYNorth Haven, CT · Dissolved | North Haven, CT | Corporation | Jan 25, 1978 | Dissolved |
| NEW ENGLAND SNACK COMPANY THENorth Haven, CT · Forfeited | North Haven, CT | Corporation | Jan 24, 1978 | Forfeited |
| MARLIN FIREARMS COMPANY THENorth Haven, CT · Merged | North Haven, CT | Corporation | Jan 15, 1926 | Merged |
| VUOLO AUTO SALES, INC.North Haven, CT · Active | North Haven, CT | Corporation | Jan 5, 1978 | Active |
| PARENTE ASSOCIATES, INCORPORATEDNorth Haven, CT · Dissolved | North Haven, CT | Corporation | Aug 17, 1977 | Dissolved |
| TEMPLE SWEETHEARTS SQUARE DANCE CLUB, INC.North Haven, CT · Active | North Haven, CT | Corporation | Feb 22, 1978 | Active |
| E & S MARCARELLI, INC.North Haven, CT · Dissolved | North Haven, CT | Corporation | Feb 27, 1978 | Dissolved |