| Name |
County |
| Prospect Harbor Post Office |
Hancock County |
| Rangeley Post Office |
Franklin County |
| Raymond Post Office |
Cumberland County |
| Readfield Post Office |
Kennebec County |
| Richmond Post Office |
Sagadahoc County |
| Robbinston Post Office |
Washington County |
| Rockland Post Office |
Knox County |
| Rockport Post Office |
Knox County |
| Rockwood Post Office |
Somerset County |
| Round Pond Post Office |
Lincoln County |
| Roxbury Post Office |
Oxford County |
| Rumford Post Office |
Oxford County |
| Sabattus Post Office |
Androscoggin County |
| Saco Post Office |
York County |
| Saint Agatha Post Office |
Aroostook County |
| Saint Albans Post Office |
Somerset County |
| Saint David Post Office |
Aroostook County |
| Saint Francis Post Office |
Aroostook County |
| Salsbury Cove Post Office |
Hancock County |
| Sandford Post Office |
York County |
| Sangerville Post Office |
Piscataquis County |
| Scarborough Post Office |
Cumberland County |
| Seal Cove Post Office |
Hancock County |
| Seal Harbor Post Office |
Hancock County |
| Searsmont Post Office |
Waldo County |
| Searsport Post Office |
Waldo County |
| Sebago Post Office |
Cumberland County |
| Sebasco Estates Post Office |
Sagadahoc County |
| Sedgwick Post Office |
Hancock County |
| Shapleigh Post Office |
York County |
| Shawmut Post Office |
Somerset County |
| Sherman Post Office |
Aroostook County |
| Sinclair Post Office |
Aroostook County |
| Skowhegan Post Office |
Somerset County |
| Smithfield Post Office |
Somerset County |
| Smyrna Mills Post Office |
Aroostook County |
| Solon Post Office |
Somerset County |
| Sorrento Post Office |
Hancock County |
| South Berwick Post Office |
York County |
| South Bristol Post Office |
Lincoln County |
| South Casco Post Office |
Cumberland County |
| South China Post Office |
Kennebec County |
| South Freeport Post Office |
Cumberland County |
| South Gardner Post Office |
Kennebec County |
| South Lewiston Post Office |
Androscoggin County |
| South Paris Post Office |
Oxford County |
| South Portland Post Office |
Cumberland County |
| South Thomaston Post Office |
Knox County |
| South Windham Post Office |
Cumberland County |
| Southern Main Carrier Unit Post Office |
Cumberland County |
| Southport Post Office |
Lincoln County |
| Southwest Harbor Post Office |
Hancock County |
| Springfield Post Office |
Penobscot County |
| Springvale Post Office |
York County |
| Spruce Head Post Office |
Knox County |
| Stacyville Post Office |
Penobscot County |
| Standish Post Office |
Cumberland County |
| Station A Post Office |
Cumberland County |
| Steep Falls Post Office |
Cumberland County |
| Stetson Post Office |
Penobscot County |
| Steuben Post Office |
Washington County |
| Stillwater Post Office |
Penobscot County |
| Stockholm Post Office |
Aroostook County |
| Stockton Springs Post Office |
Waldo County |
| Stoneham Post Office |
Oxford County |
| Stonington Post Office |
Hancock County |
| Stratton Post Office |
Franklin County |
| Strong Post Office |
Franklin County |
| Sullivan Post Office |
Hancock County |
| Sumner Post Office |
Oxford County |
| Sunset Post Office |
Hancock County |
| Surry Post Office |
Hancock County |
| Swan's Island Post Office |
Hancock County |
| Temple Post Office |
Franklin County |
| Tenants Harbor Post Office |
Knox County |
