Connecticut - Criteria: B (person)
| Twain, Mark, House |
| Uncasville School |
| Union Baptist Church |
| Warner, Jonathan, House |
| Washington Street School |
| Waterbury Municipal Center Complex |
| Webb, Joseph, House |
| Webster, Noah, Birthplace |
| Welch, David, House |
| Welles, Gideon, House |
| Westport Bank and Trust Company |
| Whittlesey, Ambrose, House |
| Wilcox, Crittenden Mill |
| Williams, Austin F., Carriagehouse and House |
| Williams, Eleazer, House |
| Williams, J. B., Co. Historic District |
| Williams, Warham, House |
| Williams, William, House |
| Wilson, John, House |
| Windham Center Historic District |
| Winthrop Mill |
| Wolcott, Oliver, House |
Data from United States Park Service and Wikidata
