Indiana - Criteria: C (architecture/engineering)
| Wood, John, Old Mill |
| Woodruff Place |
| Woodside |
| Work, John, House and Mill Site |
| Wright, Thomas T., House |
| Wylie, Andrew, House |
| Wyndham |
| Wynkoop-Taylor-Swanson-Sharp Farmstead |
| Wysor Heights Historic District |
| YMCA |
| Yoder, Menno, Polygonal Barn |
| York, W. H., Round Barn |
| Young, John, House |
| Young, Martin, House |
| Young, William, House |
| Young Women's Christian Association |
| Young-Yentes-Mattern Farm |
| Yount's Woolen Mill and Boarding House |
| YWCA |
| YWCA |
| YWCA Blue Triangle Residence Hall |
| Zacke Cox Bridge |
| Zahn Historic District |
| Zeppenfeld, August, House |
| Zimmer, Justin, House |
| Zion Evangelical Church |
Data from United States Park Service and Wikidata
