Louisiana - Significance region: Local
| Narrows Plantation House |
| Nelson, Médard, Home and School |
| Nesom, G.W., House |
| Neville High School |
| Newberger House |
| New Iberia High School |
| New Orleans and Northeastern-New Orleans and Great Northern Railroad Depot |
| New Orleans Federal Savings and Loan Building |
| New Roads Commercial Historic District |
| Nicholls, Francis T., Junior College Main Building |
| Nichols House |
| Nicholson School |
| Noble Building |
| Northwestern State University Historic District |
| Norwegian Seamen's Church |
| Oak Grove Community House |
| Oak Hall |
| Oakland Cemetery |
| Oaklawn Plantation |
| Oaks Hotel |
| Oaks, The |
| Oaks, The |
| Oakwold Plantation House |
| Oasis, The |
| Odd Fellows Hall |
| Odd Fellows Rest Cemetery |
| ODECO Building |
| Ogilvie Hardware Company Building |
| Oil Center Historic District |
| Oil City School |
| Old Arabi Historic District |
| Old Castillo Hotel |
| Old Guaranty Bank Building |
| Old Handleman Building |
| Old Hickory |
| Old Jefferson Parish Courthouse |
| Old Lafayette City Hall |
| Old Pineville Town Hall |
| Olinde Building |
| OLIVE JEANETTE |
| One Shell Square |
| Opelousas City Hall |
| Opelousas Historic District |
| Orange Grove Plantation House |
| Ory House |
| Ouachita Coca-Cola Bottling Company, Inc.-Ouachita Candy Company, Inc. |
| Ouachita Parish High School |
| Our Lady of Grace Church |
| Our Lady of Lourdes Parish Complex |
| Our Lady of Peace Catholic Church |
| Our Lady of the Assumption School |
| Palace Theatre |
| Palo Alto Dependency |
| Park View Guest House |
| Parkview Historic District |
| Pascal Building |
| Patin House |
| Patterson Commercial Historic District |
| Pecan Grove Plantation House |
| Pecue House |
| Pegram Plantation House |
| Pellerin-Chauffe House |
| Peltier House |
| Penne, Henri, House |
| Pennington, S. A., House |
| People's National Bank |
| Percy-Lobdell Building |
| Perry House |
| Perseverance Benevolent and Mutual Aid Society Hall |
| Pessou House |
| Petitpierre-Kleinpeter, Joseph, House |
| Phillips School |
| Pitre, Vic House |
| Plaquemine High School |
| Plaquemine Historic District |
| Plaza Tower |
| Pleasant View Plantation House |
| Poche House |
| Poiret Place |
| Polmer Store |
| Ponchatoula Commercial Historic District |
| Pontchartrain Park Historic District |
| Ponthieu, Adam, Store-Big Bend Post Office |
| Poplar Chapel AME Church |
| Port Allen High School |
| Poydras High School |
| Prescott Memorial Library-Louisiana Tech University |
| President's Home, Northwestern State University |
| Price's Beauty Shop |
| Priestley, Alfred C., Junior High School |
| Prince Hall Masonic Temple |
| Promised Land |
| Prude House |
| Prud'homme, Jean Pierre Emmanuel, Oakland Plantation |
| Prudhomme, Michel, House |
| Rabalais House |
| Rabassa, Jean Louis, House |
| Randal House |
| Ransonet House |
| Rapides Bank and Trust Company Building |
Data from United States Park Service and Wikidata
