| 451-TOWN | One Independence Hill, Farmingville | 631-451-8696 | 451-TOWN |
| Airport | Brookhaven-Calabro Airport | 631-281-5100 | General Aviation |
| Animal Shelter | 300 Horseblock Road, Brookhaven | 631-286-4940 | AnimalShelter |
| Assessor | One Independence Hill, Farmingville | 631-451-6300 | Assessor |
| Board of Ethics | One Independence Hill, Farmingville | 631-451-7299 | Board of Ethics |
| Board of Zoning Appeals | One Independence Hill, Farmingville | 631-451-6477 | Board of Zoning Appeals |
| Brookhaven Aquatic Center | 300 Mastic Beach Road, Mastic Beach | 631-281-2870 | Beaches and Pools |
| Building | One Independence Hill, Farmingville | 631-451-6333 | Division of Building |
| Centereach Pool | Hawkins Road, Centereach | 631-698-8663 | Beaches and Pools |
| Code Enforcement | One Independence Hill, Farmingville | 631-451-6161 | Code Enforcement |
| Economic Development | One Independence Hill, Farmingville | 631-451-6563 | Economic Development |
| Engineering | One Independence Hill, Farmingville | 631-451-6336 | Special Districts |
| Environmental Protection | One Independence Hill, Farmingville | 631-451-6455 | Environmental Protection |
| Finance | One Independence Hill, Farmingville | 631-451-6680 | Finance |
| Fire Prevention | One Independence Hill, Farmingville | 631-451-6262 | Division of Fire Prevention |
| Harbors & Waterways | 130 West Broadway, Port Jefferson | 631-473-3052 | Harbors & Waterways |
| Highway | 1140 Old Town Road, Coram | 631-451-9200 | Highway Department |
| Holtsville Pool | 249 Buckley Road, Holtsville | 631-475-4507 | Beaches and Pools |
| Housing and Human Services | One Independence Hill, Farmingville | 631-451-6600 | Housing and Human Services |
| Information Technology | One Independence Hill, Farmingville | 631-451-6606 | Information Technology |
| Law Department | One Independence Hill, Farmingville | 631-451-6500 | Law Department |
| Mailroom | One Independence Hill, Farmingville | 631-451-6533 | |
| Parking Violations Bureau | One Independence Hill, Farmingville | 631-451-6180 | Parking Violations Bureau |
Parks, Recreation, Sports & Cultural Resources / Administration | 286 Hawkins Road, Centereach | 631-451-8696 | Parks & Recreation |
| Payroll | One Independence Hill, Farmingville | 631-451-6680 | Finance |
| Personnel | One Independence Hill, Farmingville | 631-451-6633 | Personnel |
| Planning | One Independence Hill, Farmingville | 631-451-6400 | Planning, Environment, & Land Management |
| Planning Board | One Independence Hill, Farmingville | 631-451-6403 | Planning Board |
| Public Information | One Independence Hill, Farmingville | 631-451-6260 | Public Information |
| Public Safety / Administration | One Independence Hill, Farmingville | 631-451-6291 | Public Safety |
| Purchasing | One Independence Hill, Farmingville | 631-451-6252 | Purchasing |
| Receiver of Taxes | One Independence Hill, Farmingville | 631-451-9009 | Receiver of Taxes |
| Senior Citizens | One Independence Hill, Farmingville | 631-451-9191 | Senior Citizens Division |
| Signage | 161 Dawn Drive, Shirley | 631-281-5137 | Signage |
| Streetlighting | One Independence Hill, Farmingville | 631-451-8696 | Traffic Safety |
| Supervisor | One Independence Hill, Farmingville | 631-451-9100 | Supervisor Office |
| Tourism Commission | One Independence Hill, Farmingville | 631-451-6100 | Tourism Commission |
| Town Clerk | One Independence Hill, Farmingville | 631-451-9101 | Town Clerk |
| Town Council | One Independence Hill, Farmingville | 631-451-6655 | Elected Officials |
| Traffic Safety | One Independence Hill, Farmingville | 631-451-8696 | Traffic Safety |
| Vehicle Control | 700 Canal Road, Mt. Sinai | 631-473-1664 | Abandoned Vehicles |
| Waste Management | One Independence Hill, Farmingville | 631-451-6222 | Waste Management |
| Water Resources | One Independence Hill, Farmingville | 631-451-6581 | |
| Women's Services | One Independence Hill, Farmingville | 631-451-6146 | Women's Services |
| Youth Bureau | One Independence Hill, Floor 2 , Farmingville | 631-451-8011 | Youth Bureau |