Iowa - Criteria: A (event)
| Washington Street and East 22nd Street Historic District |
| Washington Township Center High School |
| Waterloo East Commercial Historic District |
| Waterloo Masonic Temple |
| Waterloo Public Library-East Side Branch |
| Waterloo Ridge Menigheds Kirke og Kirkegard Historic District |
| Waterloo West Commercial Historic District |
| Waveland Round Barn |
| Waverly East Bremer Avenue Commercial Historic District |
| Waverly House |
| Waverly Municipal Hydroelectric Powerhouse |
| WCF & N Center Point Depot and Substation |
| Weber House |
| Webster, Dickinson, House |
| Wehmer House |
| Weis, Henry, House |
| Wells, George A., House |
| West Branch Commercial Historic District |
| West Grove United Methodist Church |
| West Hill Historic District |
| West Jefferson Street Historic District |
| West Liberty Commercial Historic District |
| West Liberty Fairgrounds Historic District |
| West Ninth Streetcar Line Historic District |
| West Side Residential Historic District |
| West Side Third Avenue SW. Commercial Historic District |
| West Third Street Historic District |
| West Union Commercial Historic District |
| Wherry Block |
| White, H. A., General Store and House |
| White, Munger and Company, Store |
| Whittier Friends Meeting House |
| Whittier School |
| Wickfield Round Barn |
| Wieting Theater |
| Wildwood Park Historic District |
| WILLIAM M. BLACK (dredge) |
| Williamson School |
| Williams, Seneca, Mill |
| Williges Building |
| Willow-Bluff-3rd Street Historic District |
| Wilson Buildings |
| Wilson District #7 School |
| Wilson, Paton and Hannah, House |
| Wilson, Seth and Elizabeth, House |
| Wilton Candy Kitchen |
| Wilton Commercial Historic District |
| Winterset Courthouse Square Commercial Historic District |
| Witwer Grocery Company Building |
| Women's Christian Temperance Union Public Fountain |
| Woodbine Normal and Grade School |
| Woodbine Public Library |
| Woodbine Savings Bank |
| Woodbury County Courthouse |
| Wood, Herman, Round Barn |
| Wood, Jeremiah, House |
| Woodland Place Historic District |
| W. R. C. Hall |
| Yale High School Gymnasium |
| Young, Alexander, Cabin |
| Young, John W., Round Barn |
| Youngville Cafe |
| Younker Brothers Department Store |
| Zalesky, Frank E. and Katie (Cherveny), House |
| Zoeller Bros-Independent Malting Co. |
| Zwemer Hall, Northwestern College |
Data from United States Park Service and Wikidata
