Connecticut - Significance region: Local
| Forestville Passenger Station |
| Fort Stamford Site |
| Foster, Stephen and Helen, House |
| Fourth Congregational Church |
| Fourth District School |
| Fourth Ward Historic District |
| Freeman, Mary and Eliza, Houses |
| French Farm |
| Frisbie, Edward, Homestead |
| Frisbie, Edward, House |
| Frost, Levi B., House |
| Gay, Ebenezer, House |
| George A. and Jennie Curtis Fay House |
| Gilman-Hayden House |
| Glastonbury-Rock Hill Ferry Historic District |
| Glenville School |
| Glover House |
| Glover, John, House |
| Godillot Place |
| Goffe, Solomon, House |
| Gorton, William, Farm |
| Grandview Terrace Boulevard |
| Grannis, Stephen, House |
| Grant, Ebenezer, House |
| Greeneville Historic District |
| Green Farms School |
| Greenfield Hill Grange #133 |
| Greenwich Point Historic District |
| Greenwich Town Hall |
| Greenwood Avenue Historic District |
| Gridley-Parsons-Staples Homestead |
| Griswold House |
| Gurleyville Historic District |
| Gwyn Careg |
| Hait, Benjamin, House |
| Hale, Dr. Elizur, House |
| Hall-Benedict Drug Company Building |
| Hall, Isaac Davis and Marion Dalton, House |
| Hamden Bank & Trust Building |
| Hamden Memorial Town Hall |
| Hammanasset Paper Mill Site |
| Hampton Inn |
| Harry O. Erikson Pavilion Hall |
| Hartford Colony |
| Hartford Electric Light Company Maple Avenue Sub-Station |
| Hartford National Bank and Trust |
| Hartford Special Machinery Company Complex |
| Hart, Gen. William, House |
| Hart, Timothy, House |
| Hayward House |
| Hazelton, James, House |
| Hebrew Congregation of Woodmont |
| Hempsted, Nathaniel, House |
| Hibbard, Enoch, House and Grannis, George, House |
| High Street Historic District |
| Hill's Academy |
| Hine-Buckingham Farms |
| Hodges Square Historic District |
| Holabird House |
| Holcomb, Judah, House |
| Holcomb, Nathaniel, III, House |
| Hollister, Homestead, The |
| Hollister, John, House |
| Holmes, Francis H., House |
| Home Woolen Company |
| Hooker, Henry, House |
| Hotchkiss, David, House |
| Hotel America |
| Hotel Beach |
| Housatonic Railroad Station |
| House at 1010 Shuttle Meadow Road |
| House at 130 Mohegan Avenue |
| House at 140 and 144 Retreat Avenue |
| House at 590 West Street |
| Howd-Linsley House |
| Hoyt-Burwell-Morse House |
| Hubbard Heights Historic District |
| Hubbard, Nehemiah, House |
| Humphrey, John, House |
| Humphreys, Gen. David, House |
| Hunt, Dr. Chester, Office |
| Huntington, Col. Joshua, House |
| Hurd, William, House |
| Hurlbutt Street School |
| Hurwood Company |
| Hyatt, Thomas, House |
| Hyde-St. John House |
| Imperial Granum-Joseph Parker Buildings |
| Israel Putnam School |
| Ives-Baldwin House |
| Jail Hill Historic District |
| Jefferson-Seymour District |
| Jerome, William I, House |
| Jillson, William, Stone House |
| Johnson, Alphonso, House |
| Johnson, Franklin, House |
| Judson, Capt. David, House |
| June, Lewis, House |
| Kellogg, Gen. Martin, House |
| Kelsey, Enoch, House |
Data from United States Park Service and Wikidata
