Ohio - Criteria: C (architecture/engineering)
| Wilson, Valentine, House |
| Winans, Dr. J. C., House |
| Windsor Mills Christ Church Episcopal |
| Windsor Public School |
| Winterringer Building and House |
| Winter, William, Stone House |
| Winton Place Methodist Episcopal Church |
| Wintzer, Charles, Building |
| Wiswell Road Covered Bridge |
| 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 |
| 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 |
| Worth, Gorham A., House |
| Worthington Historical Society Museum |
| Worthington United Presbyterian Church |
| W.P. SNYDER, JR. (steamboat) |
| Wright Cycle Company-Wright and Wright Printing Offices |
| Wright, Daniel Thew, House |
| Wright, Dr. Aaron, House |
| Wright, Dr. John A., House |
| Wright Flyer III |
| Wright, Horace, House |
| Wright, John, Mansion |
| Wright, Lyman, Building |
| Wyandot County Courthouse and Jail |
| Wyandotte Building |
| Wyoming Presbyterian Church |
| Xenia Carnegie Library |
| Yager, John and Carrie, House |
| Y Bridge |
| Yeager, John J., House |
| Yellow Springs Historic District |
| YMCA |
| York Lodge No. 563 |
| York United Methodist Church |
| Young, Benjamin and Mary, House |
| Young, Capt., House |
| Young, Thomas F., House |
| Young Woman's Christian Association |
| Young Women's Christian Association of Cincinnati |
| Yuster Building |
| YWCA Building |
| Zanesville YWCA |
| Zellers-Langel House |
| Zero Gravity Research Facility (B-2) |
| Zimmerman, Ezekiel B., Octagon House |
| Zion Episcopal Church |
| Zion Lutheran Church |
| Zion Lutheran Church |
| Zion Lutheran School |
| Zion's Evangelical Lutheran Church |
| Zoarville Bridge |
| Zollinger, S., Company Building |
| Zottman House |
| Zweig Building |
Data from United States Park Service and Wikidata
