| Business | Phone |
| Mount Desert Administration 21 Sea St, Northeast Harbor 4662 | (207) 276-5531 |
| Mount Desert Ambulance 248 Sea St, Northeast Harbor 4662 | (207) 276-5111 |
| Mount Desert Harbor Master 18 Harbor Dr, Northeast Harbor 4662 | (207) 276-5737 |
| Mount Desert Municipal Office 21 Sea St, Northeast Harbor 4662 | (207) 276-5731 |
| Mount Desert Police Dept 248 Sea St, Northeast Harbor 4662 | (207) 000-1111 |
| Mount Desert Waste Water Plant Sinclair Rd, Northeast Harbor 4662 | (207) 276-5738 |