Iowa - Significance region: Local
| Tromley, George, Sr., House |
| Troy Academy |
| Tulleys, Lysander, House |
| Turner, Francis A. and Rose M., House |
| Turner, Fred G., House |
| Turner Hall |
| Turner, Susie P., Double House |
| Tuttle, Thomas F. and Nancy, House |
| Twombley, Voltaire, Building |
| Tyden Farm No. 6 Farmstead Historic District |
| Ulysses Simpson Grant Elementary School |
| Union Bakery |
| Union Block |
| Union Brewery |
| Union Cemetery Gardener's Cottage |
| Union Church |
| Union Electric Telephone & Telegraph |
| Union Presbyterian Church |
| Union Savings Bank and Trust |
| Union Station and Burlington Freight House |
| Union Sunday School |
| United Presbyterian Church, Summerset |
| United States Post Office and Courthouse |
| United States Post Office and Court House |
| Universalist Church |
| Untiedt, Claus, House |
| Upper Central Avenue Commercial Historic District |
| Upper Iowa Street Historic District |
| Upper Main Street Historic District |
| Upper Paradise |
| Upper Stone Schoolhouse |
| U. S. Post Office |
| U.S. Post Office |
| U.S. Post Office and Courthouse |
| US Post Office-Iowa Falls |
| Vail, Mrs. Marian D.-Prof. Charles Noyes Kinney House |
| Valley Auto Co.-Morgan Auto Co. Garage |
| Valley Junction Commercial Historic District |
| Valley Junction-West Des Moines City Hall and Engine House |
| Valley Mills |
| Van Asch, William, House-Huibert Debooy Commercial Room |
| Van Den Berg, Hendrik J. and Wilhelmina H., Cottage |
| Vander Veer Park Historic District |
| Vander Wilt, Dirk and Cornelia J., Cottage |
| Vander Wilt Farmstead Historic District |
| Van Loon, Dirk, House |
| Van Maren, Henry and Johanna, House-Diamond Filling Station |
| Van Sant, Samuel, House |
| Van Spanckeren, B. H. and J. H. H., Row Houses |
| Vawter, J. G. and Elizabeth S., House |
| Veneman's Bungalow Court Historic District |
| Vermeer, Gary J. and Matilda, Farmstead |
| Vermilion Estate |
| Vernon School |
| Villisca National Guard Armory |
| Vincent House |
| Vogel Place Historic District |
| Vogt House |
| Von Ach, Frank J., House |
| Voorhees, John K., House |
| Wabash Combination Depot-Moravia |
| Wagner-Mozart Music Hall |
| Wahkonsa Hotel |
| Waln, Elijah D. and Mary J. (Adams), House |
| Walnut Grove School |
| Walnut Street Baptist Church |
| Walnut Tire and Battery Co.-Globe Publishing Company Building |
| Walsh Flats/Langworth Building |
| Walter-Gimble House |
| Wapello County Courthouse |
| Wapsipinicon Mill |
| Wapsipinicon State Park Historic District |
| Ward, George H. and Loretta, House |
| Warfield, Pratt and Howell Company Warehouse |
| Warner Apartment Building |
| Warnock Building |
| Warnock, Dr. Francis B., House |
| Warren Opera House Block and Hetherington Block |
| Warrior Hotel |
| Wartburg College Historic District |
| Wartburg Teachers' Seminary |
| Washington and Elizabeth Miller Tract-Center-Soll Community Historic District |
| Washington Avenue Commercial Historic District |
| Washington County Courthouse |
| Washington Downtown Historic District |
| Washington Flats |
| Washington Gardens |
| Washington Junior High School and Jefferson Grade School |
| Washington Park |
| Washington Prairie Methodist Church |
| Washington Residential Historic District |
| Washington Street and East 22nd Street Historic District |
| Washington Township Center High School |
| Wasson, Dr. Jesse, Building |
| Waterfield, William, House |
| 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 |
Data from United States Park Service and Wikidata
