Colorado - Criteria: C (architecture/engineering)
| Dyer, Samuel, House |
| Eads Community Church |
| Earl School |
| East High School |
| East Inlet Trail |
| Eastlake Farmers Co-Operative Elevator Company |
| East Longs Peak Trail-Longs Peak Trail-Keyhole Route-Shelf Trail |
| East Side Historic District |
| East Sixth Avenue Parkway |
| East Street School |
| Eaton, Aaron James, House |
| Echo Lake Park |
| Edgemont |
| Edgeplain |
| Edgerton House |
| Eldora Historic District |
| Elitch Gardens Carousel |
| Elitch Theatre |
| El Monte Hotel |
| El Paso County Courthouse |
| El Pomar Estate |
| Elsner, John, House |
| Emerson School |
| Emmanuel Presbyterian Church |
| EM Ranch |
| Engine No. 463 |
| Englewood Post Office |
| Eppich Apartments |
| Equitable Building |
| Ertel Funeral Home |
| Estabrook Historic District |
| Evans, Anne, Mountain Home |
| Evans-Elbert Ranch |
| Evans, J.G., Barn |
| Evans School |
| Evergreen Cemetery |
| Evergreen Corner Rural Historic District |
| Fairplay Hotel |
| Fall River Entrance Historic District |
| Fall River Pass Ranger Station |
| Fall River Pump House and Catchment Basin |
| Farmers State Bank Building |
| Farmers State Bank of Cope |
| Fay, William and Anna, House |
| Fern Lake Trail |
| Field, Eugene, House |
| Finney, Dr. Frank, House |
| Fire Station No. 1 |
| First Baptist Church |
| First Baptist Church |
| First Baptist Church |
| First Baptist Church of Boulder |
| First Baptist Church of Denver |
| First Baptist Church of Moffat |
| First Christian Church |
| First Congregational Church |
| First Congregational Church |
| First Congregational Church |
| First Congregational Church |
| First Congregational Church of Lyons |
| First Evangelical Lutheran Church |
| First Methodist Episcopal Church |
| First Methodist Episcopal Church |
| First Methodist Episcopal Church |
| First Methodist Episcopal Church |
| First Methodist Episcopal Church |
| First Methodist Episcopal Church of Delta |
| First National Bank Building |
| First National Bank Building |
| First National Bank Building |
| First National Bank of Douglas County |
| First National Bank of Haxtun |
| First Presbyterian Church |
| First Presbyterian Church of Eckert |
| First Presbyterian Church of Golden-Unger House |
| First Presbyterian Church of Ramah |
| First Unitarian Society of Denver |
| First United Presbyterian Church |
| First United Presbyterian Church |
| Fisher, William G., House |
| Fisher-Zugelder House and Smith Cottage |
| Fitch Terrace |
| Fitzroy Place |
| Flattop Mountain Trail |
| Fleming-Hanington House |
| Florissant School |
| Flower, John S., House |
| Flowers, Jacob and Elizabeth, House |
| Flower-Vaile House |
| Foidel Canyon School |
| Ford, Justina, House |
| Fort Collins Armory |
| Fort Collins Municipal Railway No. 22 |
| Fort Collins Post Office |
| Fort Lyon |
| Fort Morgan Power Plant Building |
| Fort Morgan State Armory |
| Fort, The |
| Fort Vasquez |
| Foster, A. C., Building |
Data from United States Park Service and Wikidata
