| Name | Deductibility Code |
| Academy Elementary School Parents Council | -- |
| Act II Thrift Shop Inc. | -- |
| Antigravity Mx Inc. | -- |
| Art Start Incorporated | -- |
| Arthur and Myra Mahon Charitable Foundation | 4 |
| Call to Care Uganda Inc. | -- |
| Cameron Kravitt Foundation | -- |
| Camp Laurelwood Inc. | -- |
| Charlotte L Evarts Memorial Archives Inc. | -- |
| Clout Cares Inc. | -- |
| Corey Scot Erskine Memorial Foundation Inc. | -- |
| Country School Incorporated | -- |
| Deacon John-Grave Foundation Inc. | -- |
| Diana Family Foundation | 4 |
| Dorr Family Foundation | 4 |
| Dr Shawky F Karas Foundation for the Advancement of Coptic People | 4 |
| E C Scranton Memorial Library | -- |
| Friends of Hammonasset Inc. | -- |
| Friends of Madison Youth Inc. | -- |
| Giving Asha Inc. | -- |
| Grassroots Fund for the Environment Inc. | 4 |
| Island Avenue School Parent Teacher Organization | -- |
| Jacobs Team Foundation | -- |
| Jeffrey School Parent Teachers Organization | -- |
| Jim Jacobs Charitable Foundation Inc. | 4 |
| Kic Foundation Inc. | -- |
| Larry W McCurdy Family Foundation Tr | 4 |
| Laurel Wood Foundation Ltd. | -- |
| Madison ABC Program Incorporated | -- |
| Madison Ambulance Association Inc. | -- |
| Madison Art Society | -- |
| Madison Board of Education | -- |
| Madison Cable Access Group Inc. | -- |
| Madison Christian Ministries Inc. | -- |
| Madison Community Services Inc. | -- |
| Madison Cultural Arts | 4 |
| Madison Fireworks Organization Inc. | -- |
| Madison Historical Society Inc. | -- |
| Madison Hoop Dreams Llc | -- |
| Madison Hose Co-1 Inc. | 6 |
| Madison Interfaith Residential Community Inc. | -- |
| Madison Land Conservation Trust Inc. | -- |
| Madison Lions Foundation Inc. | -- |
| Madison Rotary Foundation Inc. | -- |
| Madison Youth Basketball Association | -- |
| Madison Youth Lacrosse Assoc | -- |
| Madison Youth Soccer Booster Club | -- |
| Mount Carmel Burying Ground Society of Hamden | 6 |
| Nlcc Guardian Fund Inc. | -- |
| North Branford Ancient Fife & Drum Corps | -- |
| North Madison Volunteer Fire Co Inc. | 6 |
| Operation Music Aid | -- |
| Project Turning Point Inc. | 4 |
| PTA Connecticut Inc. | -- |
| Raposo Scholarship Inc. | -- |
| Robert H Brown School Pto | -- |
| Ruth and Jack Glantz Family Foundation Inc. | 4 |
| Ryerson Parent-Teacher Organization | -- |
| Setso Project Inc. | -- |
| Shirley French Lilac Inc. | -- |
| Shoreline Christian Church | -- |
| Shoreline Christian School Inc. | -- |
| Shoreline Youth Symphony Orchestra Inc. | -- |
| Smith College Club of New Haven | -- |
| Southern Connecticut Christian Network | -- |
| Summer Hill Foundation | 4 |
| Sunshine House Inc. | -- |
| The Madison Foundation Inc. | -- |
| Warren Foundation Inc. | 4 |