All - Constructed - 1860–1869
| Hodgden, Perry, House |
| Holden-Leonard Mill Complex |
| Holmes-Tallman House |
| Holt, Benjamin, House |
| Holt-Frost House |
| Holy Cross Church and Convent |
| Holy Cross Roman Catholic Church |
| Holy Trinity Episcopal Church |
| Hopkins, Elisha, House |
| Horner, John Scott, House |
| Horton-Suiter House |
| Hoss, Henry, House |
| Hot Lake Resort |
| House at 102 Staniford Street |
| House at 12 West Water Street |
| House at 14 Chestnut Street |
| House at 197 Morrison Avenue |
| House at 19 Tremont Street |
| House at 20 Hancock Road |
| House at 2212 Commonwealth Avenue |
| House at 307 Lexington Street |
| House at 44 Stanton Road |
| House at 5556 Flushing Road |
| House at 81-83 Gardner Street |
| House at 81 Pearl Street |
| Howe, Richard, House |
| Howes, Byron, House |
| Hoyt, Benjamin, House |
| Hudson River State Hospital, Main Building |
| Huffman Mill Covered Bridge |
| Hughes, Langston, House |
| Huguenot Schoolhouse |
| Hulme, Samuel and Sarah, House |
| Humphrey, Herman L., House |
| Huron Islands Lighthouse |
| Hutchison, Joshua K., House |
| Hyde Chapel |
| Illinois State Capitol |
| Immaculate Conception Catholic Church and Cemetery |
| Immaculate Conception Church |
| Immaculate Conception Church |
| Indiana Soldiers' and Sailors' Children's Home |
| Ingersoll, John N., House |
| Ione City Centenary Church |
| Iowa Soldiers' Orphans' Home |
| Iron Block |
| Irvin-Hamrick Log House |
| Jackson Bridge |
| Jacksonville-to-Fort Klamath Military Wagon Road |
| Jacobs, Cyrus, House |
| James, C. N., Cabin |
| James Pratt Funeral Service |
| James River Steam Brewery Cellars |
| Jefferson Grain Warehouse |
| Jefferson Town House |
| Jemison, Robert, Servants' House |
| Jenkins, Franklin B., House |
| Jennings, H.N., House |
| Jensvold, Gulbrand and Bertha, House |
| Jericho Covered Bridge |
| Johnson, Franklin, House |
| Johnston's Line |
| Joliet Steel Works |
| Jones, A.D. (Boss), House |
| Jones, Tauy, House |
| Jonesville Store |
| Jones, William R., House |
| Jordan Brewery Ruins |
| Jordan Historic District |
| Joseph-Cherrington House |
| Julius' Bar |
| Jupiter Inlet Lighthouse |
| Kam Wah Chung Company Building |
| Kansas State Capitol |
| Keck, Joseph, House |
| Kelly, John B., House |
| Kemp, John and Margarethe, Cabin |
| Kendall Cabinet Shop |
| Kendall Manor |
| Kenosha Light Station |
| Keyes, Amos, House |
| King Block |
| Kings County Savings Bank |
| Kingsley, Chester, House |
| Kinney, A., House |
| Kinnickinnic Church |
| Knight's Ferry Bridge |
| Kohlmann, Friederich, House |
| Kurtz House |
| Kvindherred Lutheran Church, School and Cemetery |
| Labauve, Felix, House |
| LaGrange District School |
| Lamar, Lucius Quintus Cincinnatus, House |
| Lamartina Building |
| Lanesfield School |
| La Perla Auditorium and Public Library |
| Lapham, Ambrose S., House |
| Las Flores Adobe |
| Lathrop House |
| Lawrence, William, House |
Data from United States Park Service and Wikidata
