| Business | Phone |
| Advantagetel Communications 46 Central St, Winthrop 4364 | (207) 377-3312 |
| Cameron Electric Rr 135 E, Winthrop 4364 | (207) 377-6081 |
| Dan Kaplan Electric 190 Route 133, Winthrop 4364 | (207) 377-2991 |
| Region Lake Electric Winthrop Center Rd, Winthrop 4364 | (207) 441-3707 |
| Steve Kaplan Electric 190 State Route 133, Winthrop 4364 | (207) 377-3066 |
| Winthrop Electric 39 Cross Rd, Winthrop 4364 | (207) 377-6046 |