Maine - Criteria: A (event)
| Granite Store |
| Grant, Gooden, House |
| Grant, Peter, House |
| Gray House, Old |
| Great Chebeague Golf Club |
| Great Duck Island Light Station |
| Great Falls Historic District |
| Great Fire of 1911 Historic District |
| Greenacre |
| Green Memorial A.M.E. Zion Church |
| Greenough, Byron, Block |
| Greenwood Cattle Pound |
| Greenwood Town Hall, Former |
| Greer's Corner School |
| Grindle Point Light Station |
| Gustaf Adolph Lutheran Church |
| Halfway Rock Light Station |
| Hallowell Historic District |
| Hall's Tavern |
| Hamblen Development Historic District |
| Hammond, Edward J., Hall |
| Hampden Academy |
| Hancock County Jail |
| Hancock, John, Warehouse |
| Hancock Point School |
| Harbor Lane-Eden Street Historic District |
| Harmony Hall |
| Harraseeket Historic District |
| Harriman School |
| Harrington Meetinghouse |
| Hartford Fire Station |
| Haskell, Squire Ignatius, House |
| Hatch House |
| Hathaway Barn |
| Hathorn Hall, Bates College |
| Hayford Block |
| Head Tide Historic District |
| Healey Asylum |
| Heal Family House |
| Hemlock Bridge |
| Hendricks Head Light Station |
| Herbert, The |
| Heron Neck Light Station |
| Hershey Plow Company Building |
| Higgins Barn |
| Highseas |
| High Street Historic District |
| Hinckley Hill Historic District |
| Hobbs, Thomas, Jr., House |
| Hodgkins, Ella R., Intermediate School |
| Holden, Samuel, House |
| Holden Town Hall |
| Holmes-Crafts Homestead |
| Hudson, H., Law Office |
| Hunniwell, Richard, House |
| Huse, John E.L., Memorial School |
| Hussey Plow Company Building |
| Indian Island Light Station |
| Influence, The |
| Intervale Farm |
| Irish, J. & O., Store |
| ISAAC H. EVANS (schooner) |
| Island Falls Opera House |
| Isle Au Haut Light Station |
| Islesboro Free Library |
| Islesford Historical Museum and Blue Ducks Ships Store |
| Isles of Shoals |
| Jacobs Houses and Store |
| Jacobson, Pehr J., House |
| Jefferson Cattle Pound |
| Jefferson Town House |
| J. & E. RIGGIN (schooner) |
| Jesup Memorial Library |
| Johnson, Dennis, Lumber Company Mill |
| Jonas Cutting-Edward Kent House |
| Jonathan Fisher Memorial |
| Jonesboro Grange #357 |
| Jones, John Paul, Memorial Park |
| Jordan, F.M., House |
| Jordan School |
| Katahdin Ironworks |
| KATAHDIN (Lake Boat) |
| Keen Hall |
| Kennebec Arsenal |
| Kennebec River Light Station |
| Kennebunk High School |
| Kennebunk Historic District |
| Kennebunkport Historic District |
| Kennebunk River Club |
| Kent's Hill School Historic District |
| Keystone Mineral Springs |
| Kineo Cottage Row Historic District |
| Knowlton, Jabez, Store |
| Lakeside Grange #63 |
| Lakewood Theater |
| Lancaster Block |
| Land's End Historic District |
| Larsson-Noak Historic District |
| Laudholm Farm |
| Lermond Mill |
Data from United States Park Service and Wikidata
