Maine - Area of significance: Industry
| Ambajejus Boom House |
| American Woolen Company Foxcroft Mill |
| Androscoggin Swinging Bridge |
| Auburn Commercial Historic District |
| Bailey, Moses, House |
| Bangs, Algernon, House |
| Barker Mill |
| Bass Boarding House |
| Bates Mill Historic District |
| Bath Historic District |
| Biddeford Main Street Historic District |
| Biddeford-Saco Mills Historic District |
| Blue Hill Historic District |
| Boarding House and Storehouse at Churchill Depot |
| Bodwell Water Power Company Plant |
| Bond Street Historic District |
| Bowman-Carney House |
| Brick House Historic District |
| Building at 84-96 Hammond Street |
| Castine Historic District |
| Chandler-Parsons Blacksmith Shop |
| Cherryfield Historic District |
| Chesuncook Village |
| Clary Mill |
| Colburn House State Historic Site |
| Continental Mill Housing |
| Crooker, W. D., House |
| Cumberland and Oxford Canal |
| Cumberland Mills Historic District |
| Cummings Shoe Factory |
| Cushman, Charles L., House |
| Days Ferry Historic District |
| Deering, J. G., House |
| Dexter Grist Mill |
| Dingley, Frank L., House |
| Donnell, William T., House |
| Dunn & Elliot Sail Loft |
| Dyer-Hutchinson Farm |
| East Machias Historic District |
| East Main Street Historic District |
| Eastport Historic District |
| East Vassalboro Grist and Saw Mill |
| Ellsworth Power House and Dam |
| Elms |
| Farmington Historic District |
| Farwell Brothers Store |
| Farwell Mill |
| Foss, Horatio G., House |
| Frankfort Dam |
| Gay-Munroe House |
| Gerald Hotel |
| Goodall, Thomas, House |
| Great Falls Historic District |
| Great Northern Paper Company Administration Historic District |
| Hallowell Historic District |
| Harward Family House |
| Head Tide Historic District |
| Hershey Plow Company Building |
| Hichborn, Nathan G., House |
| Holland, Captain, House |
| Holland-Drew House |
| Holmes-Crafts Homestead |
| Hurd, Mary R., House |
| Hussey Plow Company Building |
| Hyde Mansion |
| Johnson, Dennis, Lumber Company Mill |
| Katahdin Ironworks |
| Kennebec Arsenal |
| Keystone Mineral Springs |
| Larsson-Noak Historic District |
| Lermond Mill |
| Lewiston Mills and Water Power System Historic District |
| Limerick Upper Village Historic District |
| Lockwood Mill Historic District |
| Maine Spinning Company Mill |
| Main Street Historic District |
| Mallett, E. B., Office Building |
| Mansion House, The |
| Marsh Stream Farm |
| McCobb-Hill-Minott House |
| McCurdy Smokehouse |
| McGilvery, Capt. William, House |
| Mechanics' Hall |
| Merriconegan Farm |
| Mill Agent's House |
| Mill at Freedom Falls |
| Morse & Co. Office Building |
| Mount Waldo Granite Works |
| North Berwick Woolen Mill |
| Old Grist Mill |
| Old Tavern |
| Parsons, Stephen, House |
| Pejepscot Paper Company |
| Percy and Small Shipyard |
| Perry, William F., House |
| Pittston Farm |
| Poland Spring Historic District |
| Portland Packing Company Factory |
| Portsmouth Company Cotton Mills: Counting House |
| Portsmouth Naval Shipyard |
Data from United States Park Service and Wikidata
