Connecticut - Area of significance: Architecture
| West End South Historic District |
| West Goshen Historic District |
| West Granby Historic District |
| West Haven Green Historic District |
| West Hill Historic District |
| West Mountain Historic District |
| Westport Bank and Trust Company |
| Westport Center Historic District |
| West Street School |
| Westville Village Historic District |
| Wethersfield Avenue Car Barn |
| Wetmore, Seth, House |
| Whale Oil Row |
| Wheeler, Adin, House and Theodore F. Wheeler Wheelwright Shop |
| Wheeler-Beecher House |
| Wheeler Block |
| Wheeler, Ephraim, House |
| Wheeler, Jonathan, House |
| Whitehall Mansion |
| White-Overton-Callander House |
| White's Tavern |
| Whitfield Cowles House |
| Whitfield, Henry, House |
| Whitfield, Henry, House |
| Whiting Homestead |
| Whitman House |
| Whitney Avenue Historic District |
| Whitneyville Congregational Church |
| Whittlesey, Ambrose, House |
| Whittlesey, John, Jr., House |
| Wiard, John, House |
| Wickham Road Historic District |
| Widows' Home |
| Wightman, Rev. John, House |
| Wightman, Valentine, House |
| Wilby High School |
| Wilcox, Crittenden Mill |
| Wilcox, Josiah, House |
| Wildman, E. A., & Co. Tobacco Warehouse |
| Willard Homestead |
| William Clark Company Thread Mill |
| Williams and Stancliff Octagon Houses |
| Williams, Captain Benjamin House |
| Williams, Eleazer, House |
| Williams House |
| Williams, J. B., Co. Historic District |
| Williams Memorial Institute |
| Williams Memorial Park Historic District |
| Williams, Warham, House |
| Willimantic Armory |
| Willimantic Elks Club |
| Willimantic Freight House and Office |
| Willington Common Historic District |
| Wilmot Apartments Historic District |
| Wilson, John, House |
| Wilton Center Historic District |
| Winchester Repeating Arms Company Historic District |
| Winchester Soldiers' Monument |
| Windham Center Historic District |
| Windsor Avenue Congregational Church |
| Windsor Farms Historic District |
| Windsor Locks Passenger Station |
| Winsted Green Historic District |
| Winsted Hosiery Mill |
| Winthrop Mill |
| Witter House |
| Wolcott Green Historic District |
| Woodbridge Farm |
| Woodbridge Farmstead |
| Woodbridge Green Historic District |
| Woodbury Historic District No. 1 |
| Woodbury Historic District No. 2 |
| Wood, Harcourt, Memorial Library |
| Woodrow Wilson High School |
| Woodruff, Capt. Samuel, House |
| Woodruff, Ezekiel, House |
| Woodruff House |
| Woodruff, Jotham, House |
| Woodruff, Urbana, House |
| Woodstock Academy Classroom Building |
| Woodstock Hill Historic District |
| Woodward, Ashbel, House |
| Woodworth, Nathan A., House |
| Wooster Square Historic District |
| World War I Memorial |
| Worthington Ridge Historic District |
| Wylie School |
| Xi Chapter, Psi Upsilon Fraternity |
| Yantic Woolen Company Mill |
| Yeomans, Edward, House |
| YMCA of Northern Middlesex County |
| Zion Lutheran Church |
Data from United States Park Service and Wikidata
