Maine - Area of significance: Architecture
| Goodspeed Memorial Library |
| Goodwin, Edmund E., House |
| 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, 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 |
| Great Northern Paper Company Administration Historic District |
| Greenacre |
| Greene Cottage |
| Greenough, Byron, Block |
| Grey Havens Inn |
| Griffin House |
| Grindle Point Light Station |
| Grist Mill Bridge |
| Guilford Memorial Library |
| Gushee Family House |
| Gustaf Adolph Lutheran Church |
| 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 |
| Harward Family House |
| Hasey's Maine Stages Building |
| 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 |
| Hendricks Head Light Station |
| Herald Building |
| 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 |
| Hodgkins, Ella R., Intermediate School |
| Holden Town Hall |
| Holland, Captain, House |
| Holland-Drew House |
| Holmes Cottage |
| Holmes-Crafts Homestead |
| Holmes, Dr. Job, House |
| Holmes, Sen. John, House |
| How, Daniel, House |
| How Houses |
| Hubbard-Cotton Store |
| Hudson, H., Law Office |
| Hulls Cove High School |
| Hurd, Mary R., House |
| Hussey-Littlefield Farm |
| Huston House |
| Hutchins, Frank, House |
Data from United States Park Service and Wikidata
