Connecticut - Criteria: C (architecture/engineering)
| Fanning, Capt. Thomas, Farmstead |
| Farmington Canal Lock |
| Farmington Canal-New Haven and Northampton Canal |
| Farmington Historic District |
| Farmington River Railroad Bridge |
| Farnsworth, Samuel, House |
| Farnum House |
| Farwell Barn |
| Federal Hill Historic District |
| Fenwick Historic District |
| Ferris, Samuel, House |
| Filley, Capt. Oliver, House |
| First Baptist Church |
| First Church of Christ |
| First Church of Christ and the Ancient Burying Ground |
| First Church Parsonage |
| First Congregational Church of Cheshire |
| First Congregational Church of East Hartford and Parsonage |
| First Congregational Church of East Haven |
| First Congregational Church of Plainfield |
| First Lutheran Church of the Reformation |
| First National Bank Building |
| Fish, Abel H., House |
| Fitch, John, School |
| Five Mile Point Lighthouse |
| Five Mile River Landing Historic District |
| Flanders Historic District |
| Florence Mill |
| Footguard Hall |
| Forbes, Samuel, Homestead |
| Ford, Elinor and Sherman, House |
| Forestville Passenger Station |
| Former Fire Station |
| Fort Nathan Hale |
| Fort Shantok |
| Fort Trumbull |
| Foster, Stephen and Helen, House |
| Fourth Congregational Church |
| Fourth District School |
| French Farm |
| Frisbie, Edward, Homestead |
| Frisbie, Edward, House |
| Frog Hollow |
| Frost, Levi B., House |
| Fuller, John, House |
| Fulton, Lewis, Memorial Park |
| Fyler-Hotchkiss Estate |
| Garvan-Carroll Historic District |
| Gateway Village Historic District |
| Gay, Ebenezer, House |
| Georgetown Historic District |
| Gilbert Clock Factory |
| Gillett, Asa, House |
| Gillette, Francis, House |
| Gilman-Hayden House |
| Glastonbury Historic District |
| Glastonbury-Rock Hill Ferry Historic District |
| Glebe House |
| Glen Falls Bridge |
| Glenville Historic District |
| Glenville School |
| Glover House |
| Glover, John, House |
| Godillot Place |
| Goffe, Solomon, House |
| Goffe Street Special School for Colored Children |
| Golden Hill Historic District |
| Goodman, Timothy, House |
| Goodspeed Opera House |
| Goodwin Block |
| Gores, Landis, House |
| Gorton, William, Farm |
| Goshen Historic District |
| Gothic Cottage |
| Gould House |
| Gov. Smith Homestead |
| Grace Church Rectory |
| Graham House |
| Granby Center Historic District |
| Grandview Terrace Boulevard |
| Graniteville Historic District |
| Grannis, Stephen, House |
| Grant, Ebenezer, House |
| Great Captain Island Lighthouse |
| Greeneville Historic District |
| Green Farms School |
| Greenfield Hill Grange #133 |
| Greenfield Hill Historic District |
| Greens Ledge Lighthouse |
| Greenwich Avenue Historic District |
| Greenwich Town Hall |
| Greenwich YMCA |
| Greenwood Avenue Historic District |
| Gridley-Parsons-Staples Homestead |
| Griswold, Florence, House and Museum |
| Griswold House |
| Groton Bank Historic District |
| Grove Street Cemetery |
| Guilford Historic Town Center |
| Gurleyville Historic District |
Data from United States Park Service and Wikidata
