Maine - Area of significance: Industry
| Record, Judson, House |
| Richmond Historic District |
| Roak Block |
| Robertson Quarry Galamander |
| Rockport Historic District |
| Rockport Historic Kiln Area |
| Rumford Falls Paper Company Historic District |
| Sail Loft |
| Sanford Mills Historic District |
| Sargent, Daniel House |
| Schlotterbeck and Foss Building |
| Searsport Historic District |
| Shaw, William M., House |
| Slate House |
| Somesville Historic District |
| Stone House |
| Stroudwater Historic District |
| Swan Island Historic District |
| Thomaston Historic District |
| Thompson Icehouse |
| Tramway Historic District |
| Upton Grange No. 404 (Former) |
| Vassalboro Mill |
| Vinalhaven Galamander, The |
| Water Street |
| Watkins House and Cabins |
| Webster, Moses, House |
| Williams, Gen. John, House |
| Williams, Timothy and Jane, House |
| Williston-West Church and Parish House |
| Winterport Historic District |
| Winthrop Mills Company |
Data from United States Park Service and Wikidata
