Colorado - Role: Building
| Garnethurst |
| Gas Creek School |
| Gast Mansion |
| Gates, Russell and Elinor, Mansion |
| Gebhard Mansion |
| General Electric Building |
| Geneva Home |
| German Evangelical Immanuel Congregational Church |
| Giddings Building |
| Gimlett/LeFevre Cabin |
| Ginacci House |
| Glacier Basin Campground Ranger Station |
| Glazier House |
| Glen Eyrie |
| Glen Grove School |
| Glenisle |
| Glenwood Springs Hydroelectric Plant |
| Golden Burro Cafe and Lounge |
| Golden Cemetery |
| Golden High School |
| Goldfield City Hall and Fire Station |
| Gold Miner Hotel |
| Goodnight Barn |
| Grace and St. Stephen's Episcopal Church |
| Grace Episcopal Church |
| Grace Episcopal Church |
| Grafton, The |
| Grant-Humphreys Mansion |
| Gray, Garret and Julia, Cottage |
| Greeley High School |
| Greeley High School and Grade School |
| Greeley Junior High School |
| Greeley Masonic Temple |
| Greeley Tribune Building |
| Greeley Union Pacific Railroad Depot |
| Green Mercantile Store |
| Green Mountain Ranch |
| Greenwood Lodge |
| Gregory, William J., House |
| Grimm, S. A., Block |
| Guerrieri-Decunto House |
| Gully Homestead |
| Gwynne-Love House |
| Hagerman Mansion |
| Hahns Peak Schoolhouse |
| Hallett, Samuel I., House |
| Hamburger, George, Block |
| Hamill House |
| Hammar, Benjamin, House |
| Handy Chapel |
| Hanigan-Canino Terrace |
| Harmony Mill |
| Harris Park School |
| Harris, W. C., House |
| Hart, Wilson A., House |
| Haskell House |
| Haxby House |
| Hayden Depot |
| Hayden Rooming House |
| Hazelhurst |
| Healy 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 |
| Highland School |
| Highlands Masonic Lodge |
| Hildebrande Ranch |
| Hiwan Homestead |
| Hog Park Guard Station |
| Holdsworth House-Aspenholme-Pines Lodge |
| Holly City Hall |
| Holly Gymnasium |
| Holly Santa Fe Depot |
| Holly SS Ranch Barn |
| Holmes, David Hull, House |
| Holy Cross Abbey |
| Hope Lutheran Church |
| Hornbek House |
| Hotchkiss Hotel |
| Hotchkiss Methodist Episcopal Church |
| Hotel Boulderado |
| Hotel Colorado |
| Hotel de Paris |
| Hotel Jerome |
| Hotel Meeker |
| Hotel St. Regis |
| House at 1750 Gilpin Street |
| Hover, W.A., and Company Building |
| Howard Store |
| Hudson, Sim, Motor Company |
| Huerfano County Courthouse and Jail |
| Huerfano County High School |
| Hugo Municipal Pool |
| Humphrey House |
| Husung Hardware |
| Hutchinson Ranch |
| Hyman-Brand Building |
Data from United States Park Service and Wikidata
