Idaho - Criteria: C (architecture/engineering)
| Wargelin, Nickolai, Homestead |
| Warm Springs Avenue Historic District |
| Warren Guard Station, Building 1206 |
| Washington County Courthouse |
| Watlington, Benjamin, House |
| Watt, W. H., Building |
| Waymire, C. H., Building |
| Webster, Archie, House |
| Weigle, William, House and Water Tank |
| Weilermann, Gus, House |
| Weiser Oregon Short Line Railroad Depot |
| Weiser Post Office |
| Welch, Edward, House |
| Wellman Apartments |
| Werthheimer Building |
| West Point Grade School |
| West Warm Springs Historic District |
| White Bird Grade |
| Whitehead, William, House |
| Whitney, Grant, House |
| Whitney School |
| Wickahoney Post Office and Stage Station |
| Wilson House |
| Wives of Charles C. Rich Historic District |
| Wolters Double Houses |
| Woodward Building |
| Woolley Apartments |
| Young, Samuel and Ann, House |
| Zurcher Apartments |
Data from United States Park Service and Wikidata
