Connecticut - Role: Building
| Cone, Jared, House |
| Congregational Church of Plainville |
| Congregation Mishkan Israel |
| Connecticut General Life Insurance Company Headquarters |
| Connecticut Hall, Yale University |
| Connecticut Railway and Lighting Company Car Barn |
| Connecticut State Capitol |
| Connecticut Statehouse |
| Connecticut State Library and Supreme Court Building |
| Converse House and Barn |
| Cook, John, House |
| Cornwall Bridge Railroad Station |
| Cos Cob Railroad Station |
| Cosier-Murphy House |
| Cossitt, Frederick H., Library |
| Coult, Abraham, House |
| Cove Island Houses |
| Cowles, Capt. Josiah, House |
| Cowles, Gen. George, House |
| Crandall, Prudence, House |
| Crawford, George W., Manor |
| Cream Hill Agricultural School |
| Cream Hill Shelter |
| Curtis Memorial Library |
| Curtis, Nathaniel, House |
| Curtiss, Reuben, House |
| Dana, James Dwight, House |
| Daniels, Charles, House |
| Darling Family Farmstead and Tavern |
| Darling, James Alexis, House |
| Darling, Robert and Julia, House |
| Davenport, Deacon John, House |
| Davenport, Hanford, House |
| Day, Amasa, House |
| Day, Calvin, House |
| Day House |
| Day-Taylor House |
| Deane, Silas, House |
| Deep River Freight Station |
| Deep River Town Hall |
| Deshon-Allyn House |
| Dickerman II, Jonathan, House |
| Dillon Building |
| Dixwell Avenue Congregational United Church of Christ |
| Doane's Sawmill/Deep River Manufacturing Company |
| Dorrance Inn |
| Dr. Harvey and Rhoda Wasserman House |
| Dudley, Jedidiah, House |
| Durisol House |
| Eagle's Nest |
| East District School |
| East Haven High School |
| East Windsor Academy |
| Eclectic House, The |
| Edward Bloom Silk Company Factory |
| Eells-Stow House |
| Ein Jacob (Ayn Yacob) Synagogue |
| Elam Ives House |
| Eliot, Jared, House |
| Eliot, Samuel, House |
| Elliottville Lower Mill |
| Ellsworth, Horace H., House |
| Ellsworth, Oliver, Homestead |
| Elmore Houses |
| Elton Hotel |
| Ely, Rev. John, House |
| Emmanuel Church |
| Enfield Carnegie Library |
| Enfield Town Meetinghouse |
| Engine Company 15 Fire Station |
| Engine Company 16 Fire Station |
| Engine Company 1 Fire Station |
| Engine Company 2 Fire Station |
| Engine Company 6 Fire Station |
| Engine Company 9 Fire Station |
| Eno, Amos, House |
| Eno Memorial Hall |
| Erwin Home for Worthy and Indigent Women |
| Esperanza |
| Essex Freight Station |
| Evans, Ebenezer, House |
| Fairfield County Courthouse |
| Fairfield County Jail |
| Fairfield Historic District |
| Fairfield Railroad Stations |
| Fanning, Capt. Thomas, Farmstead |
| Farnsworth, Samuel, House |
| Farnum House |
| Farwell Barn |
| 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 |
Data from United States Park Service and Wikidata
