Wisconsin - Criteria: C (architecture/engineering)
| Our Lady of Loretto Roman Catholic Church and Cemetery |
| Our Lady of Sorrows Chapel |
| Oviatt House |
| Pabst Brewing Company Complex |
| Pabst, Frederick and Maria, House |
| Pabst Theater |
| Paine Art Center and Arboretum |
| Painesville Chapel |
| Palmer Brother's Octagons |
| Palo, John and Justina, Homestead |
| Pardeeville Presbyterian Church |
| Parker, Dwight T., Public Library |
| Park Street Historic District |
| Pearsons Hall of Science |
| Peck, Clarence, Residence |
| Peck, Walter L., House |
| Pedrick, Marcellus, House |
| Pendarvis |
| Pepin County Courthouse and Jail |
| Peshtigo Reef Light |
| Peters, George, House |
| Peterson, Seth, Cottage |
| Phillips High School |
| Phipps, William H., House |
| Physical Education Building/La Crosse State Normal School |
| Pierce, Carrie, House |
| Pierce County Courthouse |
| Pilgrim Family Farmstead |
| Pittsburgh Plate Glass Enamel Plant |
| Plankinton-Wells-Water Street Historic District |
| Pleasant Hill Residential Historic District |
| Plum Grove Primitive Methodist Church |
| Plum Island Range Rear Light |
| Plummer Mine Headframe |
| Polk County Courthouse |
| Pollock, William E., Residence |
| Polson, Mrs. Richard, House |
| Pomeroy, L. A., House |
| Pond, Daniel, Farmhouse |
| Portage Industrial Waterfront Historic District |
| Portage Retail Historic District |
| Portage Street Historic District |
| Porter, Walworth D., Duplex Residence |
| Port Washington Downtown Historic District |
| Port Washington Fire Engine House |
| Powers, Strange, House |
| Prairie Du Chien Post Office |
| Prairie Spring Hotel |
| Prairie Street Historic District |
| PRETORIA (schooner-barge) Shipwreck Site |
| Princeton Downtown Historic District |
| Pruyn, Joel M., Block |
| Public Sevice Building |
| Purdy, Willard D., Junior High and Vocational School |
| Putnam, Jane E., Memorial Chapel |
| Pythian Castle Lodge |
| Quisling Towers Apartments |
| Racine College |
| Racine County Courthouse |
| Racine Depot |
| Racine Elks Club, Lodge No. 252 |
| Racine Public Library |
| Randall Avenue Historic District |
| Rawley Point Light Station |
| Reay Boathouse |
| Recording Angel, The |
| Redwood Cottage |
| Reedsburg Brewery |
| Reedsburg Post Office |
| Reformed Presbyterian Church of Vernon |
| Regez, Jacob, Sr., House |
| Reichert, John, Farmhouse |
| Reynolds-Weed House |
| Richards Hill Residential Historic District |
| Richardson-Brinkman Cobblestone House |
| Richter, Charles Samuel, House |
| Rickeman Grocery Building |
| Ridge Avenue Historic District |
| Riggert, William, House |
| Ringling, Al, Theatre |
| Ringling, Charles, House |
| Rioux, Angeline Champeau, House |
| Ripon College Historic District |
| Risum Round Barn |
| Riverbend |
| Riverside Cemetery |
| Riviera, The |
| Roberts House |
| Robertson, John A. and Martha, House |
| Robinson, Charles, House |
| Roche-a-Cri Petroglyphs |
| Rockwood Lodge Barn and Pigsty |
| Roe, Ole K., House |
| Rogers, Henry J,. and Cremora, House |
| Roosevelt Avenue Historic District |
| Rosinco |
| Round Lake Logging Dam |
| Rountree, J. H., Mansion |
| Ruhland, Charles and Anna |
| Sacred Heart Church |
Data from United States Park Service and Wikidata
