Rhode Island - Criteria: A (event)
| Oak Lawn Village Historic District |
| O'Bannon Mill |
| Ocean Drive Historic District |
| Ocean Road Historic District |
| Ochee Spring Quarry |
| Ochre Point-Cliffs Historic District |
| Oddfellow's Hall |
| Old Colony House |
| Old Congregational Church |
| Old Harbor Historic District |
| Old Narragansett Cemetery |
| Old Narragansett Church |
| Old Slater Mill |
| Ontario Apartments |
| Oriental Mills |
| Osborn-Bennett Historic District |
| Our Lady of Lourdes Church Complex |
| Paine House |
| Palmer-Northrup House |
| Paradise School |
| Parris Brook Historic and Archeological District |
| Pascoag Grammar School |
| Patterson Brothers Commercial Building and House |
| Pawtucket Armory |
| Pawtucket City Hall |
| Pawtucket Elks Lodge Building |
| Pawtucket Post Office |
| Pawtucket Times Building |
| Pawtucket West High School |
| Pawtuxet Valley Dyeing Company |
| Pawtuxet Village Historic District |
| Peace Dale Historic District |
| Perkins Buildings |
| Perry-Carpenter Grist Mill |
| Perry, Commodore Oliver, Farm |
| Perry Mill |
| Phillipsdale Historic District |
| Phillips Insulated Wire Company Complex |
| Philmont Worsted Company Mill |
| Pine Street Historic District |
| Pitcher-Goff House |
| Plum Beach Lighthouse |
| Pocasset Worsted Company Mill |
| Point Judith Lighthouse |
| Pomham Rocks Light Station |
| Pontiac Mills |
| Poplar Point Lighthouse |
| Poppasquash Farms Historic District |
| Portsmouth Friends Meetinghouse Parsonage and Cemetery |
| President's House, Naval War College |
| Prospect Heights Housing Project |
| Providence-Biltmore Hotel |
| Providence Dyeing, Bleaching, Calendring Company |
| Providence Fruit and Produce Warehouse Company Building |
| Providence Gas Company Purifier House |
| Providence Jewelry Manufacturing Historic District |
| Providence Lying-In Hospital |
| Providence Steel and Iron Company Complex |
| Providence Telephone Company |
| Prudence Island Lighthouse |
| Quality Hill Historic District |
| Read School |
| Reservoir Avenue Sewage Pumping Station |
| Return Sludge Pumping Station, Fields Point Sewage Treatment Plant |
| Reynolds, Joseph, House |
| Rhode Island Hospital Trust Building |
| Rhode Island Red |
| Rhode Island State Airport Terminal |
| Rhode Island Statehouse |
| Rhode Island Tool Company |
| Rhodes-on-the Pawtuxet Ballroom and Gazebo |
| Rice City Historic District |
| Richmond Paper Company Mill Complex |
| Riverside Cemetery |
| Rochambeau Branch-Providence Public Library |
| Rochambeau Worsted Company Mill |
| Roger Williams National Memorial |
| Roger Williams Park Historic District |
| Rose Island Lighthouse |
| Rose Land Park Plat Historic District |
| Royal Mill Complex |
| Rumford Chemical Works and Mill House Historic District |
| Saint Thomas Episcopal Church and Rectory |
| Sakonnet Light Station |
| Saunderstown Historic District |
| Sayles, Deborah Cook, Public Library |
| Saylesville Historic District |
| Saylesville Meetinghouse |
| Scholze-Sayles House |
| Scrabbletown Historic and Archeological District |
| Shady Lea Historic District |
| Shakespeare Hall |
| Shannock Historic District |
| Shepard Company Building |
| Shiloh Church |
| Shoreby Hill Historic District |
| Sixth District Courthouse |
| Slater Park |
| Slatersville Historic District |
| Sludge Press House, Fields Point Sewage Treatment Plant |
Data from United States Park Service and Wikidata
