| Business | Phone |
| Long Island Bd Of Realtors Inc 185 Old Country Rd, Riverhead 11901 | (631) 369-6148 |
| Bagshaw Real Estate 437 E Main St, Riverhead 11901 | (631) 727-3713 |
| Commercial Network 58 Dune Dr, Riverhead 11901 | (631) 208-3000 |
| Eastern Long Island Commercial 1747 Old Country Rd, Riverhead 11901 | (631) 727-2900 |
| Essiay Associate Inc 935 Osborne Ave, Riverhead 11901 | (631) 208-9195 |
| Jamesport Realty 667 Peconic Bay Blvd, Riverhead 11901 | (631) 722-2000 |
| Richmond Realty 185 Old Country Rd # 5, Riverhead 11901 | (631) 477-1300 |
| Riverhead Enterprises 127 E Main St # 110, Riverhead 11901 | (631) 727-3318 |
| Sovereign Properties Gateway 18 Blackberry Cmns, Riverhead 11901 | (631) 727-6388 |
| Wfl Properties 55 E 2nd St, Riverhead 11901 | (631) 208-1934 |
| Wfl Properties Inc 208 East Ave, Riverhead 11901 | (631) 369-3375 |