Pennsylvania - Criteria: A (event)
| Hope Lodge |
| Hopewell Farm |
| Hopewell Historic District |
| Hopwood-Miller Tavern |
| Hornby School |
| Horseshoe Curve |
| Horsham Friends Meeting |
| Hotel Fauchere and Annex |
| Hotel Pennsylvania |
| House at Upper Laurel Iron Works |
| Houseknecht Farm |
| House of Miller at Millbach |
| Houses at 1907-1951 N. 32nd St. |
| Hovenden House, Barn and Abolition Hall |
| Howard Tunnel, Northern Central Railway |
| Hudson Grist Mill |
| Huffman Distillery and Chopping Mill |
| Hughes Covered Bridge |
| Hulmeville Historic District |
| Hunt Armory |
| Hunter's Mill Complex |
| Hunterstown Historic District |
| Huntingdon Armory |
| Huntingdon Borough Historic District |
| Huntingdon Furnace |
| Hunt, Roger, Mill |
| Hutchinson Farm |
| Idlewild Farm Complex |
| Illick's Mill |
| Independence National Historical Park |
| Independent Congregational Church |
| Indiana Armory |
| Indian Deep Farm |
| Indian Steps Cabin |
| Institute for Colored Youth |
| Institute of the Pennsylvania Hospital |
| Insurance Company of North America Building |
| Integrity Title Insurance, Trust and Safe Deposit Company |
| Irving Female College |
| Isabella Furnace |
| Isett, Jacob, House and Store |
| Ivy Mills Historic District |
| Jacks Mountain Covered Bridge |
| Jackson's Mill Covered Bridge |
| Jacksons Mill Covered Bridge |
| Jacobsburg Historic District |
| Jefferson Avenue School |
| Jefferson Elementary School |
| Jefferson Theater |
| Jenkins' Town Lyceum Building |
| Jenkintown Wyncote Train Station |
| John's Burnt Mill Bridge |
| Johnsonburg Commercial Historic District |
| Johnson Covered Bridge No. 28 |
| Johnson-Hatfield Tavern |
| Johnson, Nicholas, Mill |
| Johnston's Tavern |
| Johnstown Flood National Memorial |
| Johnstown Inclined Railway |
| Jones, Benjamin F., Cottage |
| Josiah Hess Covered Bridge No. 122 |
| Jud Christie Covered Bridge No. 95 |
| Juniata Iron Works |
| Juniata Woolen Mill and Newry Manor |
| Kane Armory |
| Karolcik Building |
| Kauffman Mill |
| Kaufmann's Department Store Warehouse |
| Kaufman's Distillery Covered Bridge |
| Keefe-Mumbower Mill |
| Keefer Covered Bridge No. 7 |
| Keefer Station Covered Bridge |
| Keller's Covered Bridge |
| Kemp's Hotel |
| Kenderdine Mill Complex |
| Kennett Square Historic District |
| Kennywood Park |
| Kensington Branch of the Philadelphia YWCA |
| Kensington High School for Girls |
| Kent, Thomas, Jr., Farm |
| Keswick Theatre |
| Keystone Hotel |
| Kidd's Mills Covered Bridge Historic District |
| Kimberton Village Historic District |
| King Covered Bridge |
| King's Bridge |
| Kingston Armory |
| Kingston House |
| Kintersburg Covered Bridge |
| Kirkland Station |
| Kirks Mills Historic District |
| Kise Mill Bridge Historic District |
| Kissling Farm |
| Kitson Woolen Mill |
| Klein Meetinghouse |
| Knabb-Bieber Mill |
| Knapp Farm |
| Knapp's Covered Bridge |
| Knauer, John, House and Mill |
| Knecht's Mill Covered Bridge |
Data from United States Park Service and Wikidata
