Florida - Significance region: Local
| North Beach Bandshell |
| Northboro Park Historic District |
| North City Historic District |
| Northeast Bartow Residential District |
| Northeast Gainesville Residential District |
| North Franklin Street Historic District |
| North Plant City Residential District |
| North Shore Historic District |
| North Shore Historic District |
| Northside High School |
| North Ward School |
| Northwest Historic District |
| North Woodlawn Cemetery |
| Northwood, Old, Historic District |
| Norton, Gould Hyde, House |
| Norton, Robert Lee, House |
| Nyberg-Swanson House |
| Oak Hill Cemetery |
| Oakland Park Elementary School |
| Oates Building |
| Ocala Historic Commercial District |
| Ocala Historic District |
| Ocala Union Station |
| Ocean Spray Hotel |
| Ocoee Christian Church |
| Oelsner Mound Archaeological Site |
| Okahumpka Rosenwald School |
| Old A.C.L. Union Depot |
| Old Baker County Courthouse |
| Old Belleair Town Hall |
| Old Belle Glade Town Hall |
| Old Bradford County Courthouse |
| Old Calhoun County Courthouse |
| Old City Waterworks |
| Old Collier County Courthouse |
| Old Fernald-Laughton Memorial Hospital |
| Old Gainesville Depot |
| Old Hamilton County Jail |
| Old Holy Redeemer Catholic Church |
| Old Howard Academy |
| Old Jacksonville Free Public Library |
| Old Live Oak City Hall |
| Old Lucerne Historic Residential District |
| Old Ortega Historic District |
| Old Palmetto Hotel |
| Old People's Home |
| Old Post Office and Customshouse |
| Old School House |
| Old School Square Historic District |
| Olds Hall |
| Old St. Johns County Jail |
| Old St. Luke's Hospital |
| Old Tampa Children's Home |
| Old Town Sebastian Historic District East |
| Old Town Sebastian Historic District, West |
| Old US Post Office and Courthouse |
| Old Wakulla County Courthouse |
| O'Leno State Park |
| Olga School |
| Ollinger-Cobb House |
| Olympia School |
| Opa-locka Bank |
| Opa-Locka Railroad Station |
| Orange City Colored School |
| Orange City Historic District |
| Orange City Town Hall |
| Orange Park Elementary School |
| Orange Park Negro Elementary School |
| Orange Springs Methodist Episcopal Church and Cemetery |
| Original Rogers Park Golf Course Site |
| Orlando Utilities Commission Administration Building |
| Ormond Fire House |
| Ormond Yacht Club |
| Osborne School |
| Osceola Apartment Hotel |
| Osceola Park Historic Residential District |
| Osprey School |
| Ostl, C. J., Site |
| 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 |
| Palatka Water Works |
| Palm Beach Daily News Building |
| Palm Beach Hotel |
| Palm Beach Mercantile Company |
| Palm Beach Town Hall |
| Palm Beach Winter Club |
| Palm Cottage |
| Palmer, Cal, Memorial Building |
| Palmerin Hotel |
| Palmer, John Denham, House |
| Palmetto Armory |
| Palmetto Beach Historic District |
| Palmetto Historic District |
Data from United States Park Service and Wikidata
