| Business | Phone |
| Castine Realty 5 Main St, Castine 4421 | (207) 326-9392 |
| Douglas W Endicott Agency 21 Main St, Castine 4421 | (207) 326-8741 |
| Saltmeadow Properties Main St, Castine 4421 | (207) 326-9116 |
| Water Street Realty Water St, Castine 4421 | (207) 326-4477 |