| Business | Phone |
| Brookhaven Abandoned Vehicles 700 Canal Rd, Mt Sinai 11766 | (631) 473-3380 |
| Brookhaven Central Motor Pool Canal Rd, Mt Sinai 11766 | (631) 473-1664 |
| Brookhaven Town Offices Harbor Beach Rd, Mt Sinai 11766 | (631) 474-8590 |
| Brookhaven Town Senior Citizen 739 Route 25a, Mt Sinai 11766 | (631) 451-6307 |
| Mount Sinai Community Center N Country Rd, Mt Sinai 11766 | (631) 473-2052 |
| Mount Sinai Fire Dist 746 Mount Sinai Coram Rd, Mt Sinai 11766 | (631) 473-2418 |
| Mount Sinai Marina Harbor Beach Rd, Mt Sinai 11766 | (631) 928-0199 |