| Business | Phone |
| American Postal Workers Union 160 Duryea Rd, Melville 11747 | (631) 454-8442 |
| National Post Mailhandlers 160 Duryea Rd, Melville 11747 | (631) 756-4701 |
| General Building Laborers 1600 Old Walt Whitman Rd, Melville 11747 | (631) 694-5566 |
| International Assn-Machinists 585 Broadhollow Rd, Melville 11747 | (516) 694-4467 |
| Printing & Graphic Comm Union 555 Broadhollow Rd # 102, Melville 11747 | (631) 293-6868 |