| Business | Phone |
| Riverhead Health Center 300 Center Dr, Riverhead 11901 | (631) 852-1818 |
| Suffolk County Health Svc Dept 100 Center Dr, Riverhead 11901 | (631) 852-1869 |
| Suffolk County Mental Health 100 Center Dr, Riverhead 11901 | (631) 852-1850 |
| Suffolk County Mental Health 300 Center Dr, Riverhead 11901 | (631) 852-1440 |
| Suffolk County Public Health 300 Center Dr, Riverhead 11901 | (631) 852-1580 |
| Suffolk Riverhead Health Center 1 County Center Dr, Riverhead 11901 | (631) 852-1800 |