Colorado - Area of significance: Architecture
| Park Point Fire Lookout |
| Park Theatre |
| Parry, William D., House |
| Patterson House |
| Pauline Chapel |
| Paulsen Farm |
| Pearce-McAllister Cottage |
| Peck House |
| Pedro-Botz House |
| Peep O Day Park |
| People's Methodist Episcopal Church |
| Peoples Presbyterian Church |
| Peterson House |
| Peters Paper Company Warehouse |
| Petrelli-DelPizzo House |
| Petticrew Stage Stop |
| Phillips County Courthouse |
| Phillips, Harry and Lilly, House |
| Photography and Armament School Buildings, Lowry Air Force Base |
| Pierce-Haley House |
| Pike's Peak Grange No. 163 |
| Pine Hall |
| Pioneer Cabin |
| Pioneer Sod House |
| Pipe Line School |
| Pitkin County Courthouse |
| Pitkin Place Historic District |
| Placer Gulch Boarding House |
| Plaza de San Luis de la Culebra |
| Plaza Hotel |
| Pleasant Valley School |
| Pleasant Valley School |
| Plummer School |
| Poncha Springs Schoolhouse |
| Ponderosa Lodge |
| Potter Highlands Historic District |
| Powell and Blair Stone Ranch |
| Preston Farm |
| Provost Homestead-Herring Farm Rural Historic Landscape |
| Prowers Country Welfare Housing |
| Prowers County Building |
| Pryor, Frank, House |
| Public Service Building |
| Pueblo City Park Zoo |
| Pueblo County Courthouse |
| Pueblo Federal Building |
| Pueblo Mountain Park |
| Pyramid Guard Station |
| Quaintance Block |
| Queen of Heaven Orphanage Summer Camp |
| Quick, Ben, Ranch and Fort |
| Railway Exchange Addition and Railway Exchange New Building |
| Rankin Presbyterian Church |
| Ray Apartments Buildings |
| Raymond, Wilbur S., House |
| Redfeather Ranger Station |
| Red Rocks Park District |
| Redstone Historic District |
| Redstone Inn |
| Reimer-Smith Oil Station |
| Reno Park Addition Historic District |
| Rhoades House |
| Rialto Theater |
| Rice, Ida M., House |
| Rice, Ward, House |
| Richards Mansion |
| Richthofen Castle |
| Rico City Hall |
| Riede's City Bakery |
| Rimrock School |
| Robertson, T. H., House |
| Robidoux, M.J. Lavina, House |
| Robinson House |
| Robinson House |
| Robison Mansion |
| Rock Creek Farm Rural Historic District |
| Rock Creek Stage Station |
| Rockland Community Church and Cemetery |
| Rock Ledge Ranch-Franzel Ranch |
| Rock Springs Ranger Station |
| Rocky Ford Post Office |
| Rocky Mountain Bank Note Company Building |
| Rocky Mountain National Park Utility Area Historic District |
| Romano, Samuel and Albina, House |
| Romeo Block |
| Rood Candy Company Building |
| Rooney Ranch |
| Root, Amos H., Building |
| Rosemount |
| Ross-Broadway Branch, Denver Public Library |
| Roth, Henry, House |
| Rourke, Eugene, House |
| Rourke Ranch Historic District |
| Roxborough State Park Archaeological District |
| Russell-Graves House |
| Russell Gulch I.O.O.F. Hall No. 47-Wagner and Askew |
| Ruth Memorial Methodist Episcopal Church |
| Sacred Heart Catholic Church |
| Sacred Heart Church |
| Sacred Heart Orphanage |
Data from United States Park Service and Wikidata
