Maine - Area of significance: Military
| Arnold Trail to Quebec |
| Barrell Homestead |
| Battery Steele |
| Burnham Tavern |
| Buxton Powder House |
| Campbell, Gen. Alexander, House |
| Castine Historic District |
| Colburn House State Historic Site |
| East Machias Historic District |
| Eighth Maine Regiment Memorial |
| Fifth Maine Regiment Community Center |
| Fort Baldwin Historic Site |
| Fort Edgecomb |
| Fort George |
| Fort Gorges |
| Fort Kent |
| Fort Knox State Park |
| Fort McClary |
| Fort McKinley Historic District |
| Fort McKinley Torpedo Storehouse |
| Fort O'Brien |
| Fort Popham Memorial |
| Fort Pownall Memorial |
| Fort Sullivan |
| Fort Western |
| Fort William Henry |
| Frisbee, Frank C., Elementary School |
| Frost Garrison and House |
| Isles of Shoals |
| Jarvis, Col. Charles and Mary Ann, Homestead |
| Kennebec Arsenal |
| Lincoln House |
| Memorial Hall |
| Morison, Capt. James, House |
| Nazi Spy Landing Site |
| Old Point and Sebastian Rale Monument |
| Pemaquid Restoration and Museum |
| Penobscot Expedition Site |
| Pepperrell, William, House |
| Portland Club |
| Portsmouth Naval Shipyard |
| Powder House Lot |
| Privateer Brigantine DEFENCE Shipwreck Site |
| Redington House |
| Thatcher, Henry Knox, House |
| """The Rim"" and Site of Fort Foster" |
| Tillson, Gen. Davis, House |
| Ulmer, George, House |
| Wadsworth Hall |
| Williams, Gen. John, House |
Data from United States Park Service and Wikidata
