| Business | Phone |
| Riverside Water District Ponquogue Ave, Hampton Bays 11946 | (631) 728-0179 |
| Southampton Bay Constable 110 Old Riverhead Rd, Hampton Bays 11946 | (631) 728-1612 |
| Southampton Bay Constable Jackson Ave, Hampton Bays 11946 | (631) 728-1612 |
| Southampton Juvenile Aid Bur 24 Jackson Ave, Hampton Bays 11946 | (631) 728-5220 |
| Southampton Street Lighting Jackson Ave, Hampton Bays 11946 | (631) 728-6513 |
| Southampton Sub Div Inspector Jackson Ave, Hampton Bays 11946 | (631) 728-2454 |
| Southampton Town Animal Shltr 102 Old Riverhead Rd, Hampton Bays 11946 | (631) 728-7387 |