Kentucky - Area of significance: Architecture
| North Main Street Historic District |
| North Main Street Historic District |
| North Main Street Historic District |
| North Main Street Historic District |
| North Main Street Historic District |
| North Race Street Historic District |
| Northside Historic Residential District |
| Northwest Residential District |
| Nuckols, Claiborne W., Farmstead |
| Nuckols, Lewis, House |
| Oakdale District |
| Oakland/Henry House |
| Oakmoor |
| O'Byrne, John, House |
| Octagon Cottage |
| Octagon Hall |
| Odd Fellows Building |
| Odd Fellows Hall |
| Odd Fellows Temple |
| Ogburn, Henry, House |
| Oglesby-Conrad |
| Oil Springs High School Gymnasium |
| Oil Springs Methodist Church |
| Old Cedar Baptist Church |
| Old Central University |
| Old Centre, Centre College |
| Old Classroom Building, Union College |
| Old Eddyville Historic District |
| Old Fort Mitchell Historic District |
| Old Governor's Mansion |
| Oldham, Mary Simpson, House |
| Old Hickman Historic District |
| Old Kentucky Tavern |
| Old Library Building |
| Old L & N Station |
| Old Log Church |
| Old Louisville Residential District |
| Old Muhlenberg County Jail |
| Old Mulkey Meetinghouse |
| Old Prentice Distillery |
| Old Presbyterian Theological Seminary |
| Old Statehouse |
| Old Statehouse Historic District |
| Old Stone Inn |
| Old Stone Tavern |
| Old Talbott Tavern |
| Old Taylor Distillery |
| Old Town Historic District |
| Old U.S. Courthouse and Post Office |
| Old U.S. Customshouse and Post Office |
| Old Wash Place |
| Old Zion Methodist Church |
| Olive Branch Methodist Episcopal Church |
| Olive Hill C & O Depot |
| Olive, Richard, House |
| Olympic, The |
| Omer/Pound House |
| O'Neal, George, House |
| O'Neal, James, House |
| Opera House and Yates Bookshop Building |
| Ort-Heeb Farm |
| Osburn House |
| Overby, L. B., House |
| Owen County Courthouse and Jail |
| Owensboro Historic Commercial District |
| Owings, Col. Thomas Deye, House |
| Owingsville Commercial District and Courthouse Square |
| Oxford Historic District |
| Oxmoor |
| Paducah City Hall |
| Paducah Coca-Cola Bottling Plant |
| Paducah Downtown Commercial District |
| Paducah Market House District |
| Paducah Northside Historic District |
| Page |
| Page-Bell House |
| Paget House and Heigold House Facade |
| Page, William House |
| Paint Lick Commercial District |
| Paint Lick Presbyterian Church |
| Paintsville City Hall |
| Paintsville Country Club |
| Paintsville High School |
| Paintsville Public Library |
| Paramount Theatre |
| Paris Cemetery Gatehouse |
| Paris Courthouse Square Historic District |
| Parke-Moore House |
| Parker House |
| Parker, Richard, House |
| Park Hills Historic District |
| Parkland Evangelical Church |
| Parkland Historic District |
| Parkland Junior High School |
| Parks, William, House |
| Parrish Place |
| Parrot House |
| Passmore, Benjamin, House |
| Passmore, George, House |
| Pate, Samuel, House |
Data from United States Park Service and Wikidata
