Connecticut - Area of significance: Architecture
| Parmelee House |
| Parsons, Samuel, House |
| Paugnut Forest Administration Building |
| Payne, Daniel, House |
| Peck, Stow & Wilcox Factory |
| Peck Tavern |
| Peoples Forest Museum |
| Pequot Colony Historic District |
| Pequotsepos Manor |
| Perkins-Bill House |
| Perkins-Clark House |
| Perkins-Rockwell House |
| Perry, David, House |
| Phelps, Capt. Elisha, House |
| Phelps, Eli, House |
| Phelps, Ezekiel, House |
| Phelps Farms Historic District |
| Phoenix Life Insurance Company Building |
| Pike, Gustavus and Sarah T., House |
| Pine Grove Historic District |
| Pine Meadow Historic District |
| Pine Orchard Union Chapel |
| Pines Bridge Historic District |
| Pinney, David, House and Barn |
| Pinto, William, House |
| Pistol Factory Dwelling |
| Pitkin, Elisha, House |
| Plainfield Street Historic District |
| Plainfield Woolen Company Mill |
| Plant, Morton Freeman, Hunting Lodge |
| Plantsville Historic District |
| Plaster House |
| Platt, Col. Asa, House |
| Pledger, Jacob, House |
| Plumb House |
| Plumb Memorial Library |
| Plymouth Center Historic District |
| Plymouth Congregational Church |
| Polish National Home |
| Pomeroy, Arthur G., House |
| Pomfret Street Historic District |
| Pomfret Town House |
| Pond-Weed House |
| Poquetanuck Village Historic District |
| Porter, Dr. J., House |
| Post, Augustus, House |
| Post Hill Historic District |
| Pratt, Dr. Ambrose, House |
| Pratt House |
| Pratt, Humphrey, Tavern |
| Pratt, Read and Company Factory Complex |
| Pratt Street Historic District |
| Preston City Historic District |
| Prospect Avenue Historic District |
| Prospect Green Historic District |
| Prospect Hill Historic District |
| Prospect Street Historic District |
| Pultz & Walkley Company |
| Putnam Farm |
| Putnam High School |
| Putnam Hill Historic District |
| Putnam Railroad Station |
| Quaker Farms Historic District |
| Quaker Hill Historic District |
| Quinebaug Mill-Quebec Square Historic District |
| Quinnipiac Brewery |
| Quinnipiac River Historic District |
| Railroad Avenue Industrial District |
| Randall, John, House |
| Raymond-Bradford Homestead |
| Raynham |
| Rectory and Church of the Immaculate Conception |
| Redding Center Historic District |
| Red Mountain Shelter |
| Remington City Historic District |
| Remington Village Historic District |
| Restmore |
| Revonah Manor Historic District |
| Richardson, Nathaniel, House |
| Rider, John, House |
| Ridgebury Congregational Church |
| Ridgefield Center Historic District |
| Rising Sun Tavern |
| River Park Historic District |
| River Road-Mead Avenue Historic District |
| Riverside Cemetery |
| River Street Historic District |
| Riverton Historic District |
| Robbins, John, House |
| Robbins, Unni II, House |
| Robinson, P., Fur Cutting Company |
| Rock Hall |
| Rock Ledge |
| Rockville Historic District |
| Rockwell House |
| Rockwell, Solomon, House |
| Rocky Hill Center Historic District |
| Rocky Hill Congregational Church |
| Rocky Neck Pavilion |
| Rogers, John, House |
Data from United States Park Service and Wikidata
