Maine - Role: Building
| Ingraham, Charles H., Cottage |
| Ingraham, Joseph Holt, House |
| Intervale Farm |
| Irish, J. & O., Store |
| Isaacson, Philip M. and Deborah N., House |
| Island Falls Opera House |
| Islesboro Free Library |
| Islesford Historical Museum and Blue Ducks Ships Store |
| Jackson, Dr. F. W., House |
| Jacobs Houses and Store |
| Jacobson, Pehr J., House |
| Jarvis, Col. Charles and Mary Ann, Homestead |
| Jay-Niles Memorial Library |
| Jefferson Town House |
| Jellison, Theodore, House |
| Jenkins, Charles W., House |
| Jesup Memorial Library |
| Jewett-Eastman House |
| Jewett, Sarah Orne, House |
| Johnson, Dennis, Lumber Company Mill |
| Jonas Cutting-Edward Kent House |
| Jonathan Fisher Memorial |
| Jones, Abel, House |
| Jonesboro Grange #357 |
| Jonesboro Union Church |
| Jones, Eli and Sybil, House |
| Jordan, Charles A., House |
| Jordan, F.M., House |
| Jordan School |
| Jordon, Col, Meltiah, House |
| Journal Building |
| Kane, John Innes, Cottage |
| Kavanagh, Gov. Edward, House |
| Keen Hall |
| Kellogg, Elijah, Church |
| Kellogg, Elijah, House |
| Kennebec County Courthouse |
| Kennebunk High School |
| Kennebunk River Club |
| Kent, Rockwell, Cottage and Studio |
| Keystone Mineral Springs |
| Kezar Falls Circulating Library |
| King, Gov. William, House |
| Kinsley, Martin, House |
| Knight-Corey House |
| Knowlton, Ebenezer, House |
| Knowlton, Jabez, Store |
| Knox County Courthouse |
| Kora Temple |
| Kresge Building |
| Kromberg Barn |
| Lady Pepperrell House |
| Lakeside Grange #63 |
| Lakewood Theater |
| Lamb Block |
| Lancaster Block |
| Laudholm Farm |
| Lawrence Library |
| Leach, Philip, House |
| Leavitt, A. B., House |
| Leavitt, James, House |
| Lee, Jesse, Church |
| Leighton, Adam P., House |
| Lermond Mill |
| Lewiston City Hall |
| Lewiston Public Library |
| Lewiston Trust and Safe Deposit Company |
| Libby-Hill Block |
| Libby-MacArthur House |
| Libby's Colonial Tea Room |
| Liberty Hall |
| Limington Academy |
| Lincoln House |
| Lincoln School |
| Lincoln Street Fire Station |
| Lincolnville Center Meeting House |
| Lisbon Falls High School |
| Lithgow House |
| Lithgow Library |
| Little, Edward, House |
| Littlefield-Chase Farmstead |
| Littlefield-Dustin Farm |
| Littlefield Homestead |
| Littlefield-Keeping House |
| Littlefield Tavern |
| Little Red Schoolhouse |
| Lombard, Alvin O., House |
| Longfellow, Stephen, House |
| Long, Zadoc, Free Library |
| Lord Block |
| Lord, Capt. Nathaniel, Mansion |
| Lord-Dane House |
| Lord Farm |
| Lord, James C., House |
| Lord Mansion |
| Loudville Church |
| Lovell Meeting House |
| Lovell Village Church |
| Lower Meeting House and East Bethel Cemetery |
| Lower Sunday River School |
Data from United States Park Service and Wikidata
