Mississippi - Area of significance: Architecture
| Old State Capitol |
| Old Superintendent's House, Tupelo Fish Hatchery |
| Old Tishomingo County Courthouse |
| Old Wesson Public School Building |
| Oliver House |
| Olsen, Lena, House |
| Orange Avenue Historic District |
| Outlaw, Dossey A., Plantation |
| Overseer's House and Outbuildings of Lang Plantation |
| Overstreet School Historic District |
| Owen-Richardson-Owen House |
| Oxford Courthouse Square Historic District |
| Parkhaven Historic District |
| Parsons, C. H., House |
| Pascagoula High School, Old |
| Pascagoula Street Railroad and Power Company |
| Patterson, Charles, House |
| Paxton House |
| Pearl Street Historic District |
| Pecan Grove |
| Pemberton's Headquarters |
| Peoples Bank and Trust Company |
| Peoples Bank of Biloxi |
| Perkins House |
| Peyton House |
| Philadelphia Historic District |
| Phoenix Hall-Johnson-Harper House |
| Pilgrim's Rest |
| Pine Ridge Church |
| Pinewood |
| Pittman Log House |
| Planters Hall |
| Pleasant Hill |
| Pleasant Hill |
| Pleasant Valley Methodist Church |
| Poindexter Park Historic District |
| Polk-Sherard-Hinman House |
| Pontotoc Historic District |
| Poplar Springs Road Historic District |
| Popular Price Store |
| Porter-Crawford House |
| Porter House |
| Porterville General Store |
| Powell-Vail House |
| Prairie Place |
| Prairie Plantation House |
| Prentiss Club |
| Prentiss Normal and Industrial Institute Historic District |
| Price-Stephens House |
| Propinquity |
| Provine House |
| Purnell, James C., House |
| Quitman Depot |
| Quitman Downtown-Mill Historic District |
| Raiford, Robert, Home and Farm |
| Railroad Section Foreman's House |
| Rankin County Courthouse |
| Ravenna |
| Ravennaside |
| Raymond Historic District |
| Rea, Dr. Robert W., House |
| Rea, James Samuel, House |
| Redding House |
| Reid House |
| Reynoir Street Historic District |
| Richland |
| Richmond |
| Ricks Memorial Library |
| Ripley Historic District |
| River Road and Western Downtown Residential Historic District |
| Riverside Plantation |
| Robbins House |
| Robertson, Smith, Elementary School |
| Robertson-Yates House |
| Rodney Center Historic District |
| Rodney Presbyterian Church |
| Rogers, Emma and Ed, House |
| Rogers, Francis M., House |
| Rogers House |
| Rogers, Newell, House |
| Roosevelt State Park |
| Roos House |
| Rosalie |
| Rose, Adolph, Building |
| Rosedale |
| Rosedale Historic District |
| Rosedale Plantation |
| Rose Hill Missionary Baptist Church |
| Rosemary-Humphreys House |
| Rosemont |
| Rosswood |
| Round Island Lighthouse |
| Routhland |
| Sacred Heart Roman Catholic Church |
| Sadler House |
| Saenger Theater |
| Saenger Theatre |
| Saint John's Episcopal Church |
| Saint Mark's Episcopal Church |
| Salisbury Plantation |
Data from United States Park Service and Wikidata
