| Business | Phone |
| Branch Office Assoc 222 Middle Country Rd, Smithtown 11787 | (631) 366-3400 |
| Colonial Manor 9 Oak Tree Dr, Smithtown 11787 | (631) 265-2280 |
| Cromwell & Tisch Construction 17 Bellemeade Ave, Smithtown 11787 | (631) 366-3336 |
| Di Canio Designed Homes 720 Smithtown Byp, Smithtown 11787 | (631) 366-4663 |
| Emmy Building Co 20 Gilbert Ave # 201, Smithtown 11787 | (631) 361-6500 |
| Graystone Builders 300 E Main St, Smithtown 11787 | (631) 360-1428 |
| J M Builders & Assoc Inc 28 Tower Pl, Smithtown 11787 | (631) 265-0015 |
| Jato Building Contractors 10 W Main St, Smithtown 11787 | (631) 724-2628 |
| S & R Building & Development 7 Salt Hay Way, Smithtown 11787 | (631) 265-9600 |