Pennsylvania - Role: Building
| Kastner, Jacob, Loghouse |
| Kauffman Mill |
| Kaufmann's Department Store Warehouse |
| Keefe-Mumbower Mill |
| Keim Homestead |
| Keith, D.S., Junior High School |
| Keith House-Washington's Headquarters |
| Keller, Jacob, Farm |
| Kelly, Amos, House |
| Kemmerer House |
| Kemp's Hotel |
| Kenderdine Mill Complex |
| Kennedy, Francis W., House |
| Kennedy Mansion |
| Kennedy, Robert, Memorial Presbyterian Church |
| Kensington Branch of the Philadelphia YWCA |
| Kensington High School for Girls |
| Kent, Thomas, Jr., Farm |
| Ker-Feal |
| Kerr, Thomas R., Dr., House and Office |
| Keswick Theatre |
| Key, Francis Scott, School |
| Keystone Building |
| Keystone Hook and Ladder Company |
| Keystone Hotel |
| Keystone Mill |
| Kinbawn |
| Kinder's Mill |
| King of Prussia Inn |
| Kingston Armory |
| Kingston House |
| Kinsey, John L., School |
| Kirkbride, Eliza Butler, School |
| Kirk Johnson Building |
| Kirkland Station |
| Kirk, William, House |
| Kistler Residence |
| Kitchen, William, House |
| Kitson Woolen Mill |
| Kittanning Passenger Station and Freight Depot |
| Klein Meetinghouse |
| Knabb-Bieber Mill |
| Knapp Farm |
| Knapp, Joseph, Hotel and Store |
| Knauer, John, House and Mill |
| Knauss, Heinrich, House |
| Knipe-Johnson Farm |
| Knipe-Moore-Rupp Farm |
| Knowlton |
| Knoxville Junior High School |
| Knurr Log House |
| Koehler, Jackson, Eagle Brewery |
| Koerner, Henry, House |
| Kolb, Dielman, Homestead |
| Krauskap, Henry, House, and Store |
| Kreider Shoe Manufacturing Company |
| Kuerner Farm-Wyeth, Andrew, Studio |
| Kulp, Isaac, Farm |
| Kunkel Building |
| Kurtz, T. M., House |
| Kuster Mill |
| Kutz Mill |
| Kutztown 1892 Public School Building |
| Kutztown Silk Mill |
| La Blanche Apartments |
| Lacawac |
| Lacey, Gen. John, Homestead |
| Lackawanna County Courthouse and John Mitchell Monument |
| Lady Washington Inn |
| Lafayette's Quarters |
| Lahr Farm |
| Lake City School |
| Lancaster Armory |
| Lancaster County Courthouse |
| Lancaster County House of Employment |
| Lancaster Crematorium |
| Lancaster Trust Company |
| Lancaster Watch Company |
| Landis Homestead |
| Landis Shoe Company Building |
| Landreth, David, School |
| Land Title Building |
| Lane House |
| Langhorne Library |
| Langhorne Manor School |
| Langley High School |
| Lansdale Silk Hosiery Company-Interstate Hosiery Mills, Inc. |
| Lansdowne Theatre |
| Lapp Log House |
| Larimer School |
| Larkin-Belber Building |
| Latimer School |
| Latrobe Armory |
| Laughlin, Hugh, House |
| Laurel-Rex Fire Company House |
| Lawndale School |
| Lawrence County Courthouse |
| Lawrence Public School |
| Lazaretto, The |
| Leader Theater |
Data from United States Park Service and Wikidata
