Maine - Criteria: C (architecture/engineering)
| Gay-Munroe House |
| Gerald, Amos, House |
| German Church and Cemetery |
| Gilmore House |
| Glidden-Austin Block |
| Goat Island Light Station |
| Godfrey-Kellogg House |
| Goodale-Bourne Farm |
| Goodale-Stevens Farm |
| Goodall, Louis B., Memorial Library |
| Goodall, Thomas, House |
| Goodspeed Memorial Library |
| Goodwin, Edmund E., House |
| Goose Rocks Light Station |
| Gordon Fox Ranch |
| Gorham Campus Historic District |
| Gorham Historic District |
| Gothic House, The |
| Gould House |
| Governor Brann School |
| GRACE BAILEY (two-masted schooner) |
| Grace Episcopal Church |
| Grand Army Memorial Home |
| Grand, The |
| Grand Trunk Railroad Station |
| Granite Store |
| Grant Family House |
| Grant, Peter, House |
| Grant, William F., House |
| Graves, Abbott, House |
| Gray House, Old |
| Gray Memorial United Methodist Church and Parsonage |
| Great Duck Island Light Station |
| Great Falls Historic District |
| Great Fire of 1911 Historic District |
| Greenacre |
| Greenough, Byron, Block |
| Greenwood, Chester and Isabel, House |
| Grey Havens Inn |
| Griffin House |
| Grindle Point Light Station |
| Grist Mill Bridge |
| Guilford Memorial Library |
| Gushee Family House |
| Halfway Rock Light Station |
| Hall, Enoch, House |
| Hall House |
| Hallowell Historic District |
| Hall's Tavern |
| Hamblen Block |
| Hamblen Development Historic District |
| Hamilton, Jonathan, House |
| Hamilton, Thomas, House |
| Hamlin, Hannibal, House |
| Hammond, Edward J., Hall |
| Hammond Street Congregation Church |
| Hampden Academy |
| Hampden Congregational Church |
| Hancock County Jail |
| Hancock Point School |
| Hanson, Asa, Block |
| Harbor Lane-Eden Street Historic District |
| Hardscrabble Farm |
| Harper Family House |
| Harpswell Meetinghouse |
| Harraseeket Historic District |
| Harris, Nathan, House |
| Harward Family House |
| Haskell, Squire Ignatius, House |
| Hatch House |
| Hathaway Barn |
| Hathorn, Lt. John, House |
| Hawkes Pharmacy |
| Hayford Block |
| Haystack Mountain School of Crafts |
| Head Tide Historic District |
| Heald House |
| Healey Asylum |
| Heal Family House |
| Hemlock Bridge |
| Hendricks Head Light Station |
| Herbert, The |
| Heron Neck Light Station |
| Hexagon Barn |
| Heywood, Phineas, House |
| Hichborn, Nathan G., House |
| Higgins Barn |
| Highseas |
| High Street Historic District |
| Hill, Gov. John F., Mansion |
| Hinckley Good Will Home Historic District |
| Hinckley Hill Historic District |
| Hinckley, Ward, House |
| History House |
| Hobbs, Thomas, Jr., House |
| Hodgdon Site |
| Hodgkins, Ella R., Intermediate School |
| Holden Town Hall |
| Holland, Captain, House |
| Holland-Drew House |
Data from United States Park Service and Wikidata
