New Hampshire - Area of significance: Architecture
| Kensington Town Center Historic District |
| Kensington Town House |
| Kent, Moses, House |
| Killicut-Way House |
| Kimball Brothers Shoe Factory |
| Kimball Castle |
| Knights-Morey House |
| Knollwood |
| Laconia District Court |
| Laconia Passenger Station |
| Lamprey, Reuben, Homestead |
| Lamson Farm |
| Lane, Deacon Samuel and Jabez, Homestead |
| Lane, Edward H., House |
| Langdon Meeting House |
| Larkin-Rice House |
| Lattice Cottage |
| Lear House |
| Learned, Amos, Farm |
| Learned, Benjamin, House |
| Learned Homestead |
| Leavitt Farm |
| Lehoullier Building |
| Lempster Meetinghouse |
| Lisbon Inn |
| Little Boar's Head Historic District |
| Little Red School House 1835 District No. 7 |
| Littleton Community House & Annex |
| Littleton Town Building |
| Locke, Elijah, House |
| Long, William H., Memorial |
| Lord's Hill Historic District |
| Lower Corner Historic District |
| Lower Intervale Grange #321 |
| Lower Village District |
| Lower Warner Meetinghouse |
| Lucknow |
| Lyme Center Historic District |
| Lyme Common Historic District |
| Lyndeborough Center Historic District |
| MacPheadris-Warner House |
| Madison School, District No. 1 |
| Manchester City Hall |
| Margeson, Richman, Estate |
| Markham House |
| Marshall, Benjamin, House |
| Martin Homestead |
| Martin, Micajah, Farm |
| Mason House |
| Mason-Watkins House |
| McClure-Hilton House |
| McKenna Cottage |
| Meetinghouse, The |
| Memorial Arch of Tilton |
| Meredith Public Library |
| Merrimack County Bank |
| Merrimack County Courthouse |
| Milford Town House and Library Annex |
| Millville School |
| Milton Town House |
| Moffatt-Ladd House |
| Monadnock Mills |
| Mont Vernon Town Hall |
| Monument Square Historic District |
| Mooney, Washington, House |
| Moore Farm and Twitchell Mill Site |
| Morrill, John J., Store |
| Morrill-Lassonde House |
| Morse, Capt. Thomas, Farm |
| Morse, Eli, Farm |
| Moses-Kent House |
| Mothers' and Daughters' Club House |
| Mountain View Farm |
| Mountain View House |
| Mount Washington Hotel |
| Nashua Gummed and Coated Paper Company Historic District |
| Nashua Manufacturing Company Historic District |
| Nashville Historic District |
| Neal, James, House |
| Needham House |
| Nettleton House |
| New Castle Congregational Church |
| New Durham Meetinghouse and Pound |
| New Durham Town Hall |
| New England Masonic Charitable Institute |
| New Hampshire Bank Building |
| New Hampshire Conservatory of Music and the Arts |
| New Hampshire Savings Bank Building |
| New Hampshire State Union Armory |
| New Hampshire Veterans' Association Historic District |
| New Hampton Community Church |
| Newington Center Historic District |
| Newington Railroad Depot |
| New Ipswich Center Village Historic District |
| New Ipswich Town Hall |
| Newmarket Industrial and Commercial Historic District |
| Newport Downtown Historic District |
| Nichols Memorial Library |
| North Charlestown Historic District |
| North Conway 5 and 10 Cent Store |
Data from United States Park Service and Wikidata
