Pennsylvania - Area of significance: Transportation
| Hughes Covered Bridge |
| Huntingdon Borough Historic District |
| Jacks Mountain Covered Bridge |
| Jackson's Mill Covered Bridge |
| Jacksons Mill Covered Bridge |
| Jacobsburg Historic District |
| Jenkintown Wyncote Train Station |
| John's Burnt Mill Bridge |
| Johnson Covered Bridge No. 28 |
| Johnston's Tavern |
| Johnstown Inclined Railway |
| Josiah Hess Covered Bridge No. 122 |
| Jud Christie Covered Bridge No. 95 |
| Kaufman's Distillery Covered Bridge |
| Keefer Covered Bridge No. 7 |
| Keefer Station Covered Bridge |
| Keller's Covered Bridge |
| Keystone Hotel |
| Kidd's Mills Covered Bridge Historic District |
| King Covered Bridge |
| King's Bridge |
| Kingston House |
| Kintersburg Covered Bridge |
| Kirkland Station |
| Kittanning Passenger Station and Freight Depot |
| Knapp's Covered Bridge |
| Knecht's Mill Covered Bridge |
| Knisley, Dr., Covered Bridge |
| Knoebel, Lawrence L., Covered Bridge |
| Kochendefer Covered Bridge |
| Kramer Covered Bridge No. 113 |
| Kreiderville Covered Bridge |
| Kreigbaum Covered Bridge |
| Krepps Covered Bridge |
| Kutz's Mill Bridge |
| Lairdsville Covered Bridge |
| Landis Mill Covered Bridge |
| Langhorne Historic District |
| Larkin Covered Bridge |
| Leaman Place Covered Bridge |
| Leatherman Covered Bridge |
| Leesport Lock House |
| Lehigh Canal |
| Lehigh Canal |
| Lehigh Canal; Allentown to Hopeville Section |
| Lehigh Canal: Eastern Section Glendon and Abbott Street Industrial Sites |
| Lehigh Valley Railroad Headquarters Building |
| Lehigh Valley Transit Station |
| Lehigh Water Gap Chain Bridge Toll House and East Bridge Abutment |
| Lehman's, Port Royal Covered Bridge |
| Lemont Historic District |
| Liberty Bridge |
| Ligonier Historic District |
| Lilly Bridge |
| Lime Valley Covered Bridge |
| Lippincott Covered Bridge |
| Little Gap Covered Bridge |
| Locomotive No. 6755 |
| Logan Mills Covered Bridge |
| Loux Covered Bridge |
| Lower Humbert Bridge |
| Lumberville Historic District |
| Lyle Covered Bridge |
| Manasses Guth Covered Bridge |
| Manayunk Main Street Historic District |
| Marshallton Historic District |
| Martin's Mill Covered Bridge |
| Martin's Mill Covered Bridge |
| Mauch Chunk and Summit Hill Switchback Railroad |
| Mays, Blaney Covered Bridge |
| McConnellsburg Historic District |
| McConnell's Mill Covered Bridge |
| McGees Mills Covered Bridge |
| Mercersburg Historic District |
| Mercer's Mill Covered Bridge |
| Merrill Lock No. 6 |
| Mifflinburg Historic District |
| Mikado Freight Locomotive No. 520 |
| Miller, Longdon L., Covered Bridge |
| Millersburg Ferry |
| Millersburg Passenger Rail Station |
| Millheim Historic District |
| Millmont Red Bridge |
| Milton Freight Station |
| Milton Historic District |
| Monongahela Incline |
| Mortonville Hotel |
| Mount Union Historic District |
| Mt. Pleasant Covered Bridge |
| Muddy Creek Bridge, Maryland and Pennsylvania Railroad |
| Muncy Historic District |
| Neff's Mill Covered Bridge |
| New Baltimore Bridge |
| New Freedom Railroad Station, Northern Central Railway |
| New Geneva Historic District |
| New Germantown Covered Bridge |
| New Hamburg Historical Area |
| New Hope Village District |
| Newtown Historic District |
| Nicholson House and Inn |
Data from United States Park Service and Wikidata
