Connecticut - Significance region: Local
| West End Library |
| Westport Bank and Trust Company |
| Westport Center Historic District |
| West Street School |
| Wethersfield Avenue Car Barn |
| Wheeler Block |
| Wheeler, Ephraim, House |
| Whistleville Historic District |
| Whitehall Mansion |
| White-Overton-Callander House |
| Whitfield Cowles House |
| Whittlesey, Ambrose, House |
| Whittlesey, John, Jr., House |
| Wiard, John, House |
| Widows' Home |
| Wightman, Rev. John, House |
| Wightman, Valentine, House |
| Wilby High School |
| Wilcox, Josiah, House |
| Wildman, E. A., & Co. Tobacco Warehouse |
| William Clark Company Thread Mill |
| Williams, Captain Benjamin House |
| Williams, Eleazer, House |
| Williams House |
| Williams Memorial Institute |
| Williams, Warham, House |
| Willimantic Armory |
| Willimantic Elks Club |
| Willimantic Footbridge |
| Willimantic Freight House and Office |
| Wilson, John, House |
| Winchester Soldiers' Monument |
| Windsor Avenue Congregational Church |
| Winsted Hosiery Mill |
| Winthrop Mill |
| Woodbridge Farm |
| Woodbridge Farmstead |
| Woodbridge Green Historic District |
| Woodrow Wilson High School |
| Woodruff, Ezekiel, House |
| Woodruff House |
| Woodruff, Jotham, House |
| Woodruff, Urbana, House |
| Woodward, Ashbel, House |
| Woodworth, Nathan A., House |
| Wylie School |
| Xi Chapter, Psi Upsilon Fraternity |
| Yantic Falls Historic District |
| Yeomans, Edward, House |
| YMCA of Northern Middlesex County |
Data from United States Park Service and Wikidata
