| Business | Phone |
| Burnside Realty Inc 4 Duffy Ln, Greenlawn 11740 | (631) 757-7121 |
| Harbor Gates Realty 52 Broadway, Greenlawn 11740 | (631) 269-6800 |
| Harborfield Realty 17 Lawrence St, Greenlawn 11740 | (631) 261-1100 |
| Philson Limited 103 Broadway, Greenlawn 11740 | (631) 262-7141 |