Arizona - Significance region: Local
| Old Brick Post Office |
| Old Nogales City Hall and Fire Station |
| Old Presbyterian Church |
| Olney, George A/Everett E. Ellinwood House |
| Olney, George A., House |
| O'Neill, Buckey, Cabin |
| Ong's, Jim, Market |
| Ong Yut Geong Wholesale Market |
| Orchard River Garden Park |
| Orpheum Theater |
| Osborn, William Lewis, House |
| Otis House |
| Our Lady of Guadaloupe Church |
| Our Lady of Perpetual Help Mission Church |
| Our Lady of the Blessed Sacrament Church |
| Owen Homesite |
| Ox Bow Inn |
| Packer, Alonzo Hamilton, House |
| Palmer, A.Z., House |
| Palmer, E. Payne, House |
| Palmer, Jordan, House |
| Palm Lane Gardens |
| Paramount Theatre |
| Park Avenue Bridge |
| Pascua Cultural Plaza |
| Pay'n Takit #13 |
| Pay'n Takit #25 |
| Pay'n Takit #5 |
| Peach Springs Trading Post |
| Pecan Lane Rural Historic Landscape |
| Peeples Valley School |
| Pemberton, Sarah H., House |
| Pendley Homestead Historic District |
| Peoria High School Old Main |
| Peoria Jail House |
| Period Revival House |
| Perkinsville Bridge |
| Peter House |
| Phoenix Building and Loan House |
| Phoenix Elementary School District No. 1 Administration Building |
| Phoenix LDS Second Ward Church |
| Phoenix Motor Company |
| Phoenix Seed & Feed Company |
| Phoenix Townsite |
| Phoenix Union Colored High School |
| Pie Allen Historic District |
| Pierce, Harry E., House |
| Pierce, N. Clyde, House |
| Pieri-Elliot House |
| Pierson, Adrian, House |
| Pierson Place |
| Pine Community Center Historic District |
| Pine Creek Bridge |
| Pine Crest Historic District |
| Pinedale Elementary School |
| Pioneer Market |
| Pioneer Military and Memorial Park |
| Ponderosa II |
| Portland Street Historic District |
| Potter, Dell, Ranch House |
| Pratt, Charles H., House |
| Presbyterian Church Parsonage |
| Prescott Armory Historic District |
| President's House |
| Prettyman's Meat Market and Grocery/Brigg's Jeweler |
| Price, W. Y., House |
| Prochnow House |
| Professional Building |
| Pumphouse Wash Bridge |
| Queen Creek Bridge |
| Queen Creek Bridge |
| Querino Canyon Bridge |
| Railroad Avenue Historic District |
| Railroad Steam Wrecking Crane and Tool Car |
| Ramada House |
| Rancho Arroyo |
| Rancho Joaquina House |
| Rancho Linda Vista |
| Rancho Solano |
| Randall, Alfred Jason, House |
| Ranger's Dormitory |
| Rebeil Block |
| Redden, Byron, House |
| Redden, Lowell, House |
| Redfield-Romine House |
| Regency House |
| Rehbein Grocery |
| Reppy Avenue Bridge |
| Rialto Building |
| Rialto Theatre |
| Ridgeway, David, House |
| Rincon Heights Historic District) |
| Rittenhouse Elementary School |
| Roberts House |
| Robinson, A. W., Building |
| Robles Ranch House |
| Robson Historic District |
| Rock House |
| Roman Roads |
| Ronstadt-Sims Adobe Warehouse |
Data from United States Park Service and Wikidata
