Kentucky - Significance region: Local
| Murray Woman's Club Clubhouse, The |
| Murrell, Samuel, House |
| Mutter Gottes Historic District |
| Myrtle Hill |
| Nall House |
| Nancy Elementary School |
| Nash, Dr., House |
| Nash-McDonald House |
| Nashville, Chattanooga, and St. Louis Railway Office and Freight House |
| National Foundry and Machine Company |
| National Hotel |
| National Tobacco Work Branch Stemmery |
| National Tobacco Works |
| National Tobacco Works Branch Drying House |
| Nave-Brown House |
| Neale, William P., House |
| Neal-Hamblen House |
| Neal House |
| Nelson Distillery Warehouse |
| Nesbitt, J.J., House |
| Neville-Patterson-Lamkin House |
| Newby Country Store |
| New Castle Historic Commercial District |
| New Enterprise Tobacco Warehouse |
| New Haven Battlefield Site |
| Newland Log House |
| New Liberty Historic District |
| Newman, Davis, House |
| Newport and Cincinnati Bridge |
| Newport Courthouse Square Historic District |
| New Providence Presbyterian Church |
| New Sherwood Hotel |
| Newton House |
| Newton-Kemp Houses |
| New Zion Historic District |
| Nicholasville Historic District |
| Nine Hearths |
| Nitta Yuma Historic District |
| Nock House |
| Noland, Jesse, House |
| Nolin Banking Company |
| Nolynn Baptist Church |
| Norfolk Farm Tenant Log House |
| Norman, L. C., House |
| Northeast Residential Historic District |
| Northern Bank of Kentucky |
| North Lexington Avenue Historic District |
| North Limestone Commercial District |
| North Main-North Adams Historic District |
| North Main Street Historic District |
| North Main Street Historic District |
| North Main Street Historic District |
| North Main Street Historic District |
| North Main Street Historic District |
| North Race Street Historic District |
| Northside Historic Residential District |
| Northwest Residential District |
| Nuckols, Claiborne W., Farmstead |
| Nuckols, Lewis, House |
| Nugent's Crossroad Historic District |
| Oakdale District |
| Oak Hill |
| Oakland-Freeport Historic District |
| Oakland/Henry House |
| Oakmoor |
| O'Byrne, John, House |
| Odd Fellows Building |
| Odd Fellows Building |
| Odd Fellows Hall |
| Odd Fellows Temple |
| Offutt, Capt. Andrew, Monument |
| Oil Springs High School Gymnasium |
| Oil Springs Methodist Church |
| Old Cedar Baptist Church |
| Old Central University |
| Old Fort Mitchell Historic District |
| Old Guide Cemetery |
| Oldham, Mary Simpson, House |
| Old Hickman Historic District |
| Old Kentucky Home Motel |
| Old Kentucky Tavern |
| Old Library Building |
| Old L & N Station |
| Old Log Church |
| Old Muhlenberg County Jail |
| Old Presbyterian Theological Seminary |
| Old Statehouse Historic District |
| Old Town Historic District |
| Old U.S. Courthouse and Post Office |
| Old Wash Place |
| Old Zion Methodist Church |
| Olive Branch Methodist Episcopal Church |
| Olive Hill C & O Depot |
| Olive, Richard, House |
| Oliver School |
| Olympic, The |
| Omer/Pound House |
| O'Neal, George, House |
| O'Neal, James, House |
| Osburn House |
Data from United States Park Service and Wikidata
