| Business | Phone |
| Adl Iii Architecture 24 Woodbine Ave # 1, Northport 11768 | (631) 754-4450 |
| Louise A Agnes 162 Laurel Ave, Northport 11768 | (631) 754-2950 |
| James N Keller 199 Main St # B, Northport 11768 | (631) 261-5547 |
| Lawrence L Smith Assoc Archts 115 Lisa Dr, Northport 11768 | (631) 261-9700 |
| James E Theiss 150 Waterside Rd, Northport 11768 | (631) 757-5280 |