| Business | Phone |
| A Plus Plus Plumbing Heating Smithtown 11787 | (631) 265-4447 |
| Bill Haiduk Plumbing & Heating 33 Ledgewood Dr, Smithtown 11787 | (631) 543-2928 |
| Bonded Heating & Air Inc Smithtown 11787 | (631) 543-5619 |
| Charge It Plumbing & Heating S Smithtown 11787 | (631) 567-2222 |
| Dns Plumbing & Heating Inc 222 Main St, Smithtown 11787 | (631) 863-2630 |
| Elm Plumbing & Heating Smithtown 11787 | (631) 265-4035 |
| Frank Kelly Plumbing & Heating 62 Hawkins Ave, Smithtown 11787 | (631) 724-0161 |
| Roto-Rooter Plumbing & Drain Smithtown 11787 | (631) 979-3062 |