Utah - Criteria: C (architecture/engineering)
| Kanosh Tithing Office |
| Karrick Block |
| Kearns Building |
| Kearns-St. Ann's Orphanage |
| Kearns, Thomas, Mansion and Carriage House |
| Keith, David, Mansion and Carriage House |
| Keith-O'Brien Building |
| Kelly, Albert H., House |
| Kelly, John B., House |
| Kelly, T.R., House |
| Keyser-Cullen House |
| Kimball, Burt, House |
| Knapp, Morgan A. and Clarissa R., House |
| Knight-Allen House |
| Knight Block |
| Knight Grain Elevator |
| Knight, Jesse, House |
| Knight-Mangum House |
| Knudson, Jonathan and Jennie, House |
| Kuhre, William D., House |
| Ladies Literary Club Clubhouse |
| Ladywood Apartments |
| La Frantz Apartments |
| Lagoon Roller Coaster |
| Langton, James and Susan R., House |
| Larsen, Christen, House |
| Larsen, Neils Peter, House |
| Larsen-Noyes House |
| Larsen, Oluf, House |
| Larson, Lars Peter, House |
| Lawrence Brothers and Company Store |
| Layton, George W., House |
| Layton, John Henry, House |
| Lee, John E., House |
| Lefler-Woodman Building |
| Lehi City Hall |
| Lehi North Branch Meetinghouse |
| Lehi Roller Mills |
| Lehi Ward Tithing Barn-Centennial Hall |
| Lewellyn, John T., House |
| Lewis Terrace |
| Liberty Park |
| Lime Kilns |
| Lincoln Arms Apartments |
| Lincoln Highway Bridge |
| Lindorff, Alfred, House |
| Loa Tithing Office |
| Logan High School Gymnasium |
| Logan LDS Sixth Ward Church |
| Logan Tabernacle |
| Logan Temple |
| Logan Temple Barn |
| Lollin Block |
| Loop C Comfort Station |
| Loop D Comfort Station |
| Lower 25th Street Historic District |
| Luce, Henry, House |
| Lyman, William and Julia, House |
| Lyne, Walter C., House |
| Lyons, Oscar F., House |
| Mabey, Albert and Celestine, House |
| Mabry-Van Pelt House |
| Madsen, David and Evinda, House |
| Maeser School |
| Maguire, Don, Duplex |
| Main Building of Dixie College |
| Manti City Hall |
| Manti Motor Company Building |
| Manti National Guard Armory |
| Manti Presbyterian Church |
| Manti Temple |
| Marriott, Anne P., House |
| Martin, Manfred and Ethel, House |
| Mattson, John and Mary, House |
| McAllister,James G., House |
| McCornick Building |
| McCune, Alfred W., Mansion |
| McGregor Apartments |
| McIntyre Building |
| McIntyre House |
| McLachlan, William, Farmhouse |
| McPolin Farmstead |
| Meadowcroft, Charles, House |
| Meek, Benjamin and Olivia, House |
| Meeting Hall |
| Merrihew, Harry B., Drugstore |
| Metcalf, James and Caroline M., House |
| Meyer, Frederick A. E., House |
| Mitchell, Alexander, House |
| Mitton, Samuel Crowthers, House |
| Monroe City Hall |
| Monroe Presbyterian Church |
| Morgan, David, House |
| Morgan High School Mechanical Arts Building |
| Morgan, William, House |
| Moroni Opera House |
| Morrill, John and Ella, House |
| Morris, Richard Vaughen, House |
| Mortensen-Nelson House |
| Mountain Dell Dam |
Data from United States Park Service and Wikidata
