Florida - Area of significance: Architecture
| Old St. Johns County Jail |
| Old St. Luke's Hospital |
| Old Tampa Children's Home |
| Old US Post Office and Courthouse |
| Old Wakulla County Courthouse |
| O'Leno State Park |
| Olga School |
| Ollinger-Cobb House |
| Olympia School |
| Olympia Theater and Office Building |
| Opa-locka Bank |
| Opa-Locka Company Administration Building |
| Opa-Locka Railroad Station |
| Operations and Checkout Building |
| Orange City Historic District |
| Orange City Town Hall |
| Orange Park Elementary School |
| Orange Park Negro Elementary School |
| O'Reilly House |
| Ormond Fire House |
| Ormond Hotel |
| Ormond Yacht Club |
| Osceola Apartment Hotel |
| Osceola County Courthouse |
| Osceola Park Historic Residential District |
| Osprey Archeological and Historic Site |
| Osprey School |
| Out of Door School |
| Overtown Historic District |
| Pacetti Hotel |
| Pahokee High School |
| Palace of Florence Apartments |
| Palafox Historic District |
| Palatka North Historic District |
| Palatka Ravine Gardens Historic District |
| Palatka South Historic District |
| Palm Beach Daily News Building |
| Palm Beach Hotel |
| Palm Beach Mercantile Company |
| Palm Beach Town Hall |
| Palm Beach Winter Club |
| Palm Cottage |
| Palmer House |
| Palmerin Hotel |
| Palmer, John Denham, House |
| Palmer-Perkins House |
| Palmetto Beach Historic District |
| Palmetto Historic District |
| Panama Grammar School |
| Paramount Theatre Building |
| Park Avenue Historic District |
| Parrot Jungle Historic District |
| Pasco County Courthouse |
| Payne, A.A.-Christo, John Sr., House |
| Payne, Christy, Mansion |
| Peabody Hall |
| Pendleton, William Kimbrough, House |
| Peninsular Fruit Company Building |
| Pensacola Harbor Defense Project |
| Pensacola Historic District |
| Pensacola Hospital |
| Perry Harvey Sr. Park Skateboard Bowl |
| Perry House |
| Perry Post Office, Old |
| Phillips, Dr. P., House |
| Pierce, Thomas R., House |
| Pigeon Key Historic District |
| Pinecrest Hotel, Old |
| Pinellas County Courthouse, Old |
| Pisgah United Methodist Church |
| Plaza Hotel |
| Pleasant Street Historic District |
| Plymouth Congregational Church |
| Polk County Courthouse, Old |
| Polk Hotel |
| Polk Theatre and Office Building |
| Ponce De Leon Inlet Lightstation |
| Pope Avenue Historic District |
| Porcher House |
| Porches, The |
| Porter, Dr. Joseph Y., House |
| Porter, Thomas V., House |
| Port Orange Florida East Coast Railway Freight Depot |
| Potter House |
| Price, Dr., House |
| Pritchard House |
| Proctor, Carlos and Marjorie Log House and Cottage |
| Prospect Park-Southland Park Historic District |
| Pueblo Arcade |
| Punta Gorda Atlantic Coast Line Depot |
| Punta Gorda Fish Company Cabin |
| Punta Gorda Fish Company Ice House |
| Punta Gorda Residential District |
| Punta Gorda Woman's Club |
| Purdy, Capt. W. F., House |
| Purdy Villa |
| Quincy Historic District |
| Quincy Library |
| Quincy Woman's Club |
| Ralls, William Oswell, House |
Data from United States Park Service and Wikidata
