Ohio - Area of significance: Politics/Government
| Walling, Ansel T., House |
| Walters, Dr. Jefferson A., House |
| Wapakoneta Commercial Historic District |
| Warren Commercial Historic District |
| Washington Township Voting Hall |
| Waynesville Engine House and Lockup |
| Webber, A. R., House |
| Wellington Historic District |
| Wheeling Avenue Historic District |
| Whitehall Farm |
| William Howard Taft National Historic Site |
| Williams, Abner, Log House |
| Wilmington Commercial Historic District |
| Wilson, John T., Homestead |
| Winton Terrace Historic District |
| Woodrow, William, House |
| Wright, Daniel Thew, House |
| Yeager, John J., House |
| Young, Col. Charles, House |
Data from United States Park Service and Wikidata
