Ohio - Area of significance: Architecture
| Whallon, James, House |
| Wheatley, Phillis, Association |
| Wheeler, John, House |
| Wheeling and Lake Erie Railroad Depot |
| Wheeling Avenue Historic District |
| Whitby Mansion |
| Whitehall Farm |
| White, Henry P., House |
| Whiteman, Benjamin, House |
| White, Samuel M., House |
| White, Walter C., Estate |
| Whitewater Shaker Settlement |
| Whitmer, Frieda, House |
| Whitmer, Soloman, House |
| Whitney, George W., House |
| Wick Avenue Historic District |
| Wick Building |
| Wickerham Inn |
| Wick Park Historic District |
| Wilber, J. B., House |
| Wilcox, Jacob, Farm |
| Wilcox, James, House |
| Wilcox-Mills House |
| Wilder-Swaim House |
| Wiles, Perry, Grocery Company |
| Willdred Flats |
| William Howard Taft National Historic Site |
| Williams, Abner, Log House |
| Williams County Courthouse |
| Williams, Dr. Issac Elmer, House And Office |
| Williams, Elias, House |
| Williams, Henry Harrison, House |
| Williams House |
| Williams, Judge Henry, House |
| Williams, W. L., House |
| Williard Hall |
| Willow Lane Farm |
| Wilmington Commercial Historic District |
| Wilmot United Brethren Church |
| Wilson-Falkner-Baldauf House |
| Wilson Feed Mill |
| Wilson, George D., House |
| Wilson-Gibson House |
| Wilson-Lenox House |
| Wilson, Valentine, House |
| Winans, Dr. J. C., House |
| Windsor Corners District |
| Windsor Mills Christ Church Episcopal |
| Windsor Public School |
| Winterringer Building and House |
| Winter, William, Stone House |
| Winton Place Methodist Episcopal Church |
| Winton Terrace Historic District |
| Wise, Isaac M., Temple-Center |
| Wise, Peter, House |
| Withrow High School |
| Wittenberg University Historic District |
| Wolcott, Benajah, House |
| Wolcott House |
| Wolfe, Mary A., House |
| Wood Commercial Building |
| Wood County Courthouse And Jail |
| Wood County Home and Infirmary |
| Woodland Avenue and West Side Railroad Powerhouse |
| Woodland Cemetery Association of Dayton Historic District |
| Woodland Cemetery Gateway, Chapel And Office |
| Woodland-Larchmere Commercial Historic District |
| Woodlawn Cemetery |
| Woodlawn Farm |
| Wood Old Homestead |
| Woodrow, William, House |
| Woodruff, Charles, House |
| Woodruff, William H., House |
| Woods, Tet, Building |
| Wooster Block |
| Worth, Gorham A., House |
| Worthington Historical Society Museum |
| Worthington Historic District |
| Worthington United Presbyterian Church |
| Wright, Daniel Thew, House |
| Wright, Dr. Aaron, House |
| Wright, Dr. John A., House |
| Wright, Horace, House |
| Wright, J.E. Farm |
| Wright, John, Mansion |
| Wright Library |
| Wright, Lyman, Building |
| Wyandot County Courthouse and Jail |
| Wyandotte Building |
| Wyoming Presbyterian Church |
| Xenia Carnegie Library |
| Yager, John and Carrie, House |
| Yeager, John J., House |
| Yellow Springs Historic District |
| YMCA |
| Yondota Historic District |
| York Lodge No. 563 |
| York United Methodist Church |
| Young, Benjamin and Mary, House |
| Young, Capt., House |
Data from United States Park Service and Wikidata
