Connecticut - Role: Building
| New Haven Lawn Club |
| New Haven Railroad Station |
| Newington Junction Railroad Depot |
| Newington Junction West Historic District |
| New London County Courthouse |
| New London Customhouse |
| New London Public Library |
| New London Railroad Station |
| New Mill and Depot Building, Hawthorne Woolen Mill |
| Nichols, George Pickering, House |
| Nicoll, Caroline, House |
| Noble House |
| Noble, John Glover, House |
| Norfolk Country Club House |
| Norfolk Downs Shelter |
| Northam Memorial Chapel and Gallup Memorial Gateway |
| North-West School |
| Norton, Charles H., House |
| Norton House |
| Norwalk City Hall |
| Norwalk Island Lighthouse |
| Norwich Town Hall |
| Noyes House |
| Noyes, William, Farmstead |
| Oak Lodge |
| O'Connell, Clara T., School |
| Octagon House |
| Octagon House |
| Ogden, David, House |
| Ohev Sholem Synagogue |
| Old Farm Schoolhouse |
| Old Middletown High School |
| Old Riverton Inn |
| Old Rockville High School and East School |
| Old Saybrook Town Hall and Theater |
| Old Town Hall |
| Old Town Hall |
| Old West Haven High School |
| Oliver White Tavern |
| Osbornedale |
| Osborne, John, House |
| Palace and Majestic Theaters |
| Palace Theater |
| Palmer, Capt. Nathaniel B., House |
| Palmer, Hezekiah, House |
| Palmer, Isaac, House |
| Palmer, John, House |
| Palmer, Luther, House |
| Pardee, James, House |
| Park Apartments |
| Parker House |
| Parker-Hutchinson Farm |
| Park, William, House |
| Parmelee House |
| Parsons, Samuel, House |
| Paugnut Forest Administration Building |
| Payne, Daniel, House |
| Peck, Stow & Wilcox Factory |
| Peck Tavern |
| Peoples Forest Museum |
| Pequotsepos Manor |
| Perkins-Bill House |
| Perkins-Clark House |
| Perkins, Maxwell E., House |
| Perkins-Rockwell House |
| Perry, David, House |
| Phelps, Arah, Inn |
| Phelps, Capt. Elisha, House |
| Phelps, Eli, House |
| Phelps, Ezekiel, House |
| Phoenix Life Insurance Company Building |
| Pike, Gustavus and Sarah T., House |
| Pine Orchard Union Chapel |
| Pinney, David, House and Barn |
| Pinto, William, House |
| Pistol Factory Dwelling |
| Pitkin, Elisha, House |
| Plainfield Woolen Company Mill |
| Plant, Morton Freeman, Hunting Lodge |
| Plaster House |
| Platt, Col. Asa, House |
| Pledger, Jacob, House |
| Plumb House |
| Plumb Memorial Library |
| Plymouth Congregational Church |
| Polish National Home |
| Pomeroy, Arthur G., House |
| Pomfret Town House |
| Pond-Weed House |
| Porter, Dr. J., House |
| Post, Augustus, House |
| Pratt, Dr. Ambrose, House |
| Pratt House |
| Pratt, Humphrey, Tavern |
| Pratt, Read and Company Factory Complex |
| Pultz & Walkley Company |
| Putnam Farm |
| Putnam High School |
| Putnam Railroad Station |
| Quinnipiac Brewery |
Data from United States Park Service and Wikidata
