Colorado - Area of significance: Architecture
| Head Lettuce Day-Collegiate Peaks Stampede Rodeo Grounds |
| Healy House |
| Heginbotham, W. E., House |
| Hegner, Casper Forman and Nancy Lee, House |
| Heister House |
| Helene Apartment Building |
| Hendrie and Bolthoff Warehouse Building |
| Henkel-Duke Mercantile Company Warehouse |
| Henry Huff Cabin |
| Hewes-Kirkwood Inn |
| Highland Park Historic District |
| Highland School |
| Highlands Masonic Lodge |
| Hiwan Homestead |
| Hog Park Guard Station |
| Holdsworth House-Aspenholme-Pines Lodge |
| Holland-Thompson Property |
| Hollemon-Smith Homestead and Ranch |
| Holly City Hall |
| Holly Gymnasium |
| Holly Santa Fe Depot |
| Holly SS Ranch Barn |
| Holmes, David Hull, House |
| Holy Cross Abbey |
| Hopkins Farm |
| Hornbek House |
| Hose House No. 2 |
| Hotchkiss Homestead |
| Hotchkiss Methodist Episcopal Church |
| Hotel Boulderado |
| Hotel de Paris |
| Hotel Jerome |
| Hotel Meeker |
| Hotel St. Regis |
| House at 1750 Gilpin Street |
| Hoverhome and Hover Farmstead |
| Hover, W.A., and Company Building |
| Howard Store |
| Hudson, Sim, Motor Company |
| Huerfano County Courthouse and Jail |
| Huerfano County High School |
| Hugo Municipal Pool |
| Humboldt Street Historic District |
| Humphrey House |
| Husung Hardware |
| Hutchinson Ranch |
| Hyman-Brand Building |
| Hynes, Thomas, House |
| I and M Building |
| Idaho Springs Downtown Commercial District |
| Ideal Building |
| Iglesia de San Francisco de Assisi |
| Iliff Hall |
| Indian Camp Ranch Archeological District |
| Interlaken Resort District |
| IOOF Hall |
| Jackson, F.A., House |
| Jackson, George, House |
| Jacoe Store |
| Jaffa Opera House |
| Jamaica Primary School |
| James, Harry C., House |
| Jamestown Mercantile Building |
| Jamestown Town Hall |
| Jefferson Denver South Park and Pacific Railroad Depot |
| Jewish Consuptives' Relief Society |
| Johnson Stage Station |
| Joshel, Lloyd M., House |
| Kauffman House |
| Kauffman, William, House |
| Keating, Jeffery and Mary, House |
| Keck Homestead |
| Keithley Log Cabin Development District |
| Kelley House |
| Kelley-McDonald House |
| Kenjockety |
| Kennicott Cabin |
| Kerr House |
| Kettle-Jens House |
| Key Savings and Loan Association Building |
| Keystone Hotel |
| Kim Schools |
| Kimsey-Bolten Ranch Rural Historic Landscape |
| King, Dr. Alexander T., House and Carriage House |
| Kinner, John, House |
| Kissock Block Building |
| Kistler-Rodriguez House |
| Kittredge Building |
| Knearl School |
| Knight-Wood House |
| Kohn House |
| Kopper's Hotel and Saloon |
| Kullgren House |
| Lackner's Tavern |
| La Fave Block |
| Lafayette House |
| La Hacienda |
| La Jara Depot |
| Lake Agnes Cabin |
| Lake City Historic District |
Data from United States Park Service and Wikidata
