Idaho - Area of significance: Architecture
| Nampa Department Store |
| Nampa Depot |
| Nampa First Methodist Episcopal Church |
| Nampa Historic District |
| Nampa Neighborhood Historic District, Old |
| Nampa Presbyterian Church |
| Nave Apartments |
| Neal, Halbert F. and Grace, House |
| Neal, W. Scott, House |
| Neitzel, H. R., House |
| Nelson, Wilhelmina, House and Cabins |
| Nesbit, G. V., House |
| Nesbitt, Amanda, House |
| Newman, A. G., House |
| Newman, J. W. and Rachel, House and Bunkhouse |
| New Plymouth Congregational Church |
| New Sweden School |
| Nez Perce National Historical Park |
| Nixon, Axel, House |
| Nob Hill Historic District |
| North Caldwell Historic District |
| Northern Pacific Railway Depot |
| North Shilling Historic District |
| North Side Canal Company Slaughter House |
| North Side School |
| Nuart Theater |
| Numbers, Dr. J. R., House |
| Nye, James, House |
| Oakley Historic District |
| Obendorf, George, Gothic Arch Truss Barn |
| Odd Fellows Hall |
| O'Farrell, John A., House |
| Ojala, Herman, Homestead |
| Ola School |
| Old Challis Historic District |
| Old Idaho State Penitentiary |
| Old LDS Tithing/Paris Post Building |
| Old Town Residential Historic District |
| Olley, Thomas, House |
| Olson, Charles A. and Mary, House |
| Oneida County Courthouse |
| Oneida Stake Academy |
| O'Neill Brothers Building |
| Orofino Historic District |
| Osborne, Jessie, House |
| Oughton, Jack, House |
| Our Lady of Limerick Catholic Church |
| Our Lady, Queen of Heaven Church |
| Owyhee County Courthouse |
| Pacific and Idaho Northern Railroad Depot |
| Palumbo, J. C., Fruit Company Packing Warehouse Building |
| Paris Lumber Company Building |
| Paris Photo Studio |
| Paris Public School |
| Parker, John, House |
| Paul, Denton J., Water Tank |
| Payette City Hall and Courthouse |
| Payette Lakes Club |
| Paynton, Charles, House |
| Peck, Bill, House |
| Peck, D. H., House |
| Peckham Barn |
| Pendrey, Arthur, Cottage |
| Pendrey Drug Store Building |
| Pendrey, Joe and Zina, Bungalow |
| Penwell House |
| Phelphs, Kenneth G., Barn |
| Pierce-Borah House |
| Pierce Park School |
| Pine Creek Baptist Church |
| Placerville Historic District |
| Pleasant View School II |
| Plummer Point CCC Picnic and Hiking Area |
| Pocatello Carnegie Library |
| Pocatello Federal Building |
| Pocatello Historic District |
| Pocatello Warehouse Historic District |
| Pocatello Westside Residential Historic District |
| Poison Creek Stage Station |
| Post Falls Community United Presbyterian Church |
| Poulson, Jim, House |
| Pound, Homer, House |
| Power County Courthouse |
| Prairie School II |
| Preston Bungalow |
| Price, Dan, House |
| Price, Fred, Bungalow |
| Price, Herber, Bungalow |
| Price, Joe, House |
| Price, Robert, House |
| Priebe, Walter, House |
| Priest River Experimental Forest |
| Priest River High School |
| Purdum Livery Stable |
| Quay, Greer and Jennie, House |
| Quinn Apartments |
| Ramona Theater |
| Rankin Auto Court |
| Rathdrum State Bank |
| Ream, William and Nora, House |
Data from United States Park Service and Wikidata
