Colorado - Criteria: A (event)
| Foidel Canyon School |
| Fort Collins Armory |
| Fort Collins Municipal Railway Birney Safety Streetcar No. 21 |
| Fort Garland |
| Fort Logan National Cemetery |
| Fort Lyon |
| Fort Lyon National Cemetery |
| Fort Morgan City Hall |
| Fort Morgan State Armory |
| Fort Peabody |
| Fort Vasquez |
| Fox Mine Office |
| Francisco Plaza |
| Frazier, R. T., House |
| Frisco Schoolhouse |
| Fruita Museum |
| Fuller, Granville, House |
| Gas Creek School |
| Gem Lake Trail |
| Genesee Park |
| Geneva Home |
| Georgetown Loop Railroad |
| Georgetown-Silver Plume Historic District |
| Ginacci House |
| Glenisle |
| Glenwood Springs Hydroelectric Plant |
| Golconda Mine |
| Golden Cemetery |
| Goldfield City Hall and Fire Station |
| Gold Hill Historic District |
| Gold Miner Hotel |
| Gold Prince Mine, Mill and Aerial Tramway |
| Grace and St. Stephen's Episcopal Church |
| Grace Episcopal Church |
| Granada Bridge |
| Granada Relocation Center |
| Grand Lake Lodge |
| Grand Valley Diversion Dam |
| Great Western Sugar Company Effluent Flume and Bridge |
| Greeley Masonic Temple |
| Greeley Tribune Building |
| Green Mercantile Store |
| Green Mountain Ranch |
| Greenwood Cemetery |
| Greenwood Lodge |
| Gregory, William J., House |
| Gully Homestead |
| Gunnison River Bridge I |
| Gunnison River Bridge II |
| Gunnison Tunnel |
| Hahns Peak Schoolhouse |
| Hamill House |
| Handy Chapel |
| Hanging Flume |
| Hanigan-Canino Terrace |
| Hargreaves Homestead Rural Historic District |
| Harmony Mill |
| Harms Farm |
| Harris Park School |
| Haxby House |
| Hayden Co-Operative Elevator Company |
| Hayden Depot |
| Hayden Rooming House |
| Hay's Ranch Bridge |
| Hendrie and Bolthoff Warehouse Building |
| Henkel-Duke Mercantile Company Warehouse |
| Highland School |
| Hildebrande Ranch |
| Hiwan Homestead |
| Hog Park Guard Station |
| Holden Mining and Smelting Co. |
| Holland-Thompson Property |
| Holly City Hall |
| Holly Gymnasium |
| Holly Santa Fe Depot |
| Holly SS Ranch Barn |
| Holy Cross Abbey |
| Holzwarth Historic District |
| Hope Lutheran Church |
| Hopkins Farm |
| Hotchkiss Hotel |
| Hotel Boulderado |
| Hotel Colorado |
| Hotel Holly-Haswell Hotel |
| Hotel St. Regis |
| Hovenweep National Monument |
| Hoverhome and Hover Farmstead |
| Hover, W.A., and Company Building |
| Howard Store |
| Hudson, Sim, Motor Company |
| Huerfano Bridge |
| Huerfano County High School |
| Hugo Municipal Pool |
| Hungarian Freedom Park |
| Idaho Springs Downtown Commercial District |
| Ideal Building |
| Iglesia de la Inmaculada Concepcion |
| Iglesia de San Francisco de Assisi |
| Iglesia de San Pedro y San Pablo |
| Iliff Hall |
Data from United States Park Service and Wikidata
