| Name | Deductibility Code |
| Aikenkai Shotokan Karatedo Federation Inc. | -- |
| Alternatives Counseling Services Inc. | -- |
| Annamarie Patricia Cavanagh Bogan Family Foundation | 4 |
| Bandier Family Foundation Inc. | 4 |
| Bella Vita Celebration of Life Foundation Inc. | -- |
| Best Friends Foundation Inc. | -- |
| Chabad of Southampton Inc. | -- |
| Crusader Foundation | 4 |
| Dr Martin L Stone Charitable Foundation Inc. | 4 |
| Eastern Long Island Coastal Conservation Alliance Inc. | 4 |
| Evan Philip Scheuer Foundation Inc. | 4 |
| Friends of East End Project | -- |
| Friends of the Rogers Memorial Library | -- |
| Hampton Velo Corp | -- |
| Hamptons Community Radio Corporation | -- |
| Have A Heart Community Tr | -- |
| Heart of the Hamptons | -- |
| Honor Flight Long Island Inc. | -- |
| International Surgical Mission Support Inc. | -- |
| Joshuas Place Inc. | -- |
| Lederman Family Foundation | 4 |
| Madeline and Kevin Brine Charitable Tr | 4 |
| Mission of Angels Foundation Inc. | -- |
| Mr & Mrs Everett E Brockett Scholarship Fund Inc. | 4 |
| National Golf Links Joseph A McBride Scholarship Fund | -- |
| New Testament Baptist Church of Southampton Inc. | -- |
| North America Iapb Inc. | -- |
| North Sea Fire Department Inc. | -- |
| Ohara Family Foundation | 4 |
| Padoquohan Medicine Lodge | -- |
| Parrish Art Museum Inc. | -- |
| Paul Koster Memorial Benefit | -- |
| Peconic Land Trust Incorporated | -- |
| Respect All Cultures Everywhere | -- |
| Rogers Memorial Library Co | -- |
| Rogers Memorial Library Foundation | -- |
| Saint Andrews Preservation Foundation Inc. | -- |
| Salm Family Foundation Inc. | 4 |
| Santa Maria Club Inc. | 4 |
| Save the College at Southampton Inc. | -- |
| Shinnecock Indian Nation Fund Inc. | -- |
| Shinnecock Nation Cultural Center and Museum | -- |
| South Fork Breast Health Coalition Inc. | -- |
| Southampton Association Inc. | -- |
| Southampton Bath & Tennis Club Charitable Fund | -- |
| Southampton Care Center | -- |
| Southampton Cemetery Association | 6 |
| Southampton Community Housing and Development Corp | -- |
| Southampton Compass Foundation Inc. | -- |
| Southampton Daycare Ctr Inc. | -- |
| Southampton Fresh Air Home for Crippled Children | -- |
| Southampton Full Gospel Church Southampton Christian School | -- |
| Southampton Garden Club | -- |
| Southampton Hospital Association | -- |
| Southampton Hospital Foundation Inc. | -- |
| Southampton Preservation Society Inc. | -- |
| Southampton Rotary Club Scholarship & Endowment Fund Inc. | -- |
| Southampton Town Aquatics and Recreation Corporation | -- |
| Southampton Village Volunteer Emergency Ambulance Services Inc. | -- |
| Southampton Volunteer Ambulance Inc. | -- |
| Southampton Volunteer Firemens Benevolent Assoc Inc. | 6 |
| Southampton Youth Association Inc. | -- |
| Southampton Youth Services Inc. | -- |
| Swint Foundation | 4 |
| Thank U Inc. | 4 |
| The Hamptons Health Society Inc. | -- |
| The Southampton Colonial Society | -- |
| Time for Teens Inc. | -- |
| Tuckahoe Common School District Educational Foundation | -- |
| Turkeys 4 U Inc. | -- |
| Village Improvement Association of Southampton | -- |
| Wines Foundation Inc. | -- |