| CONNECTICUT RIVER SALMON ASSOCIATION, INC., THEGuilford, CT · Active | Guilford, CT | Corporation | Oct 21, 1974 | Active |
| EAGLE HOSE COMPANY NO. 2, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Jul 18, 1933 | Active |
| EDWARD A. NORTON POST NO. 7666, VETERANS OF FOREIGN WARS OF THE UNITED STATES, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Oct 27, 1964 | Active |
| THE ELISABETH C, ADAMS SCHOLARSHIP FUND, INC.Guilford, CT · Active | Guilford, CT | Corporation | Aug 14, 1972 | Active |
| F.C. SPENCER HOOK AND LADDER COMPANY INC.Guilford, CT · Active | Guilford, CT | Corporation | Nov 15, 1932 | Active |
| GUILFORD FOUNDATION, INC., THEGuilford, CT · Active | Guilford, CT | Corporation | Mar 12, 1975 | Active |
| HALL FAMILY FOUNDATION, INC. THEGuilford, CT · Dissolved | Guilford, CT | Corporation | Dec 20, 1954 | Dissolved |
| GUILFORD A BETTER CHANCE, INC.Guilford, CT · Active | Guilford, CT | Corporation | Mar 14, 1974 | Active |
| GUILFORD CENTER FOR CHILDREN, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Feb 10, 1971 | Active |
| SHORELINE CHAMBER OF COMMERCE, GUILFORD-BRANFORD ALLIANCE, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Jun 17, 1963 | Active |
| GUILFORD GARDEN CLUB, INCORPORATED THEGuilford, CT · Active | Guilford, CT | Corporation | Mar 18, 1957 | Active |
| THE GUILFORD ART CENTER, INC.Guilford, CT · Active | Guilford, CT | Corporation | Feb 9, 1967 | Active |
| GUILFORD INTERFAITH HOUSING CORPORATIONGuilford, CT · Active | Guilford, CT | Corporation | Mar 10, 1972 | Active |
| GUILFORD JUNIOR FOOTBALL LEAGUE, INC., THEGuilford, CT · Active | Guilford, CT | Corporation | May 6, 1970 | Active |
| GUILFORD KEEPING SOCIETY, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Jul 12, 1949 | Active |
| GUILFORD LAKES IMPROVEMENT ASSOCIATION, INC.Guilford, CT · Active | Guilford, CT | Corporation | Jun 11, 1940 | Active |
| GUILFORD LAND CONSERVATION TRUST, INC.Guilford, CT · Active | Guilford, CT | Corporation | Jul 6, 1965 | Active |
| GUILFORD LIBRARY ASSOCIATIONGuilford, CT · Active | Guilford, CT | Corporation | Jul 24, 1890 | Active |
| GUILFORD NEWCOMERS' CLUB, INC.Guilford, CT · Active | Guilford, CT | Corporation | Jul 15, 1974 | Active |
| GUILFORD ROTARY CLUB MEMORIAL EDUCATIONAL FUND, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Jan 20, 1966 | Active |
| GUILFORD SCHOLARSHIP ASSOCIATION, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Nov 17, 1938 | Active |
| THE GUILFORD SPORTMEN'S ASSOCIATION, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Oct 11, 1946 | Active |
| GUILFORD TEMPLE ASSOCIATION,INC. THEGuilford, CT · Active | Guilford, CT | Corporation | Nov 28, 1958 | Active |
| GUILFORD VOLUNTEER FIRE DEPARTMENT ASSOCIATION, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Apr 20, 1959 | Active |
| GUILFORD YACHT CLUB ASSOCIATION, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Jul 19, 1954 | Active |
| HARBOR AVENUE REALTY ASSOCIATION, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Aug 2, 1949 | Active |
| HOMESTEAD WEST ASSOCIATION, INC.Guilford, CT · Forfeited | Guilford, CT | Corporation | Apr 24, 1974 | Forfeited |
| HUNTINGTON CONDOMINIUM ASSOCIATION, INC.Guilford, CT · Active | Guilford, CT | Corporation | Dec 28, 1976 | Active |
| WINGATE, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Jul 29, 1963 | Active |
| LEETES ISLAND COMMUNITY ASSOCIATION, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Jul 22, 1948 | Active |
| LEETE'S ISLAND GARDEN CLUB, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Aug 4, 1941 | Active |
| LITTLE HARBOR LABORATORY, INC.Guilford, CT · Dissolved | Guilford, CT | Corporation | Jan 3, 1973 | Dissolved |
| MALLEY POND ASSOCIATION, INC., THEGuilford, CT · Active | Guilford, CT | Corporation | Jun 4, 1968 | Active |
| MEADOW HILLS ASSOCIATION, INC.Guilford, CT · Active | Guilford, CT | Corporation | Feb 13, 1973 | Active |
| MILITARY ORDER OF THE PURPLE HEART, INCORPORATED, THEGuilford, CT · Forfeited | Guilford, CT | Corporation | Apr 1, 1935 | Forfeited |
| NEW HAVEN COUNTY FARM BUREAU, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Dec 10, 1918 | Active |
| NEW HAVEN SPORTSMENS CLUB, INCORPORATED THEGuilford, CT · Active | Guilford, CT | Corporation | Jan 11, 1945 | Active |
| NORTH END COLONY OF WEST LAKE, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Nov 4, 1942 | Active |
| NORTH GUILFORD NURSERY SCHOOL, INC.Guilford, CT · Dissolved | Guilford, CT | Corporation | Aug 29, 1966 | Dissolved |
| NORTH GUILFORD VOLUNTEER FIRE COMPANY, INCORPORATED THEGuilford, CT · Active | Guilford, CT | Corporation | Feb 26, 1947 | Active |
| NUTILE ACRES ASSOCIATION, INC.Guilford, CT · Active | Guilford, CT | Corporation | Dec 29, 1971 | Active |
| ROBINSON'S WOODS, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Nov 14, 1966 | Active |
| SUNRISE COMMUNITY ASSOCIATION, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Dec 8, 1961 | Active |
| THIMBLE ISLANDS ASSOCIATION, INC., THEGuilford, CT · Active | Guilford, CT | Corporation | Dec 31, 1974 | Active |
| TUTTLE'S POINT BEACH ASSOCIATION, INC.Guilford, CT · Active | Guilford, CT | Corporation | Jul 15, 1971 | Active |
| TUTTLE'S POINT IMPROVEMENT ASSOCIATION,INCORPORATED,THEGuilford, CT · Active | Guilford, CT | Corporation | Sep 3, 1947 | Active |
| VALLEY SHORES ASSOCIATION, INC.Guilford, CT · Active | Guilford, CT | Corporation | Aug 25, 1970 | Active |
| WASHINGTON ENGINE COMPANY NO. 1, INCORPORATED, THEGuilford, CT · Active | Guilford, CT | Corporation | Mar 9, 1934 | Active |
| Society of Policy Scientists Inc.Guilford, CT · Active | Guilford, CT | Corporation | Sep 29, 1948 | Active |
| DOMINICAN NUNS OF NORTH GUILFORD, CONNECTICUT, INCORPORATEDGuilford, CT · Active | Guilford, CT | Corporation | Feb 28, 1947 | Active |