Maryland - Role: Building
| Towson Academy |
| Traband, John H., House |
| Tracy's Landing Tobacco House No. 2 |
| Trevanion |
| Trinity Church |
| Troth's Fortune |
| Trovinger Mill |
| Troy |
| Truman's Place |
| Trumpington |
| Truog, George, House |
| Tudor Hall |
| Tudor Hall |
| Tudor Hall |
| Tulip Hill |
| Tull, William T., House |
| Turkey Hill |
| Turner-White Casket Co. Building |
| Twin Oaks |
| Tyrconnell |
| Union Baptist Church |
| Union Bridge Station |
| Union Chapel |
| Union Grove Schoolhouse |
| Union Station, WI-150 |
| Uniontown Academy |
| United States Parcel Post Station |
| United States Post Office |
| Universal Lodge No. 14 |
| Upland |
| Upton |
| U.S. Atomic Energy Commission |
| U.S. Custom House |
| U.S. Post Office and Courthouse |
| US Post Office-Hyattsville Main |
| Valentia |
| Valhalla |
| Valley Cottage |
| Victorian Corn Cribs |
| Villa Anneslie |
| Villa DeSales |
| Vineyard, The |
| Waddy House |
| Wailes, F. Leonard, Law Office |
| Walters Bath No. 2 |
| Ward Brothers' House and Shop |
| Washington County Courthouse |
| Washington, George, House |
| Waterloo |
| Waters' River |
| Watkins Point Farm |
| Waverley |
| Waverley |
| Waverly |
| Weaver-Fox House |
| Webster's Forest |
| Welch, William H., House |
| Wesley Chapel Methodist Episcopal Church |
| West Denton Warehouse-Wharf |
| Western Fields |
| Western Maryland Railway Station |
| Western Maryland Railway Station |
| Wester Ogle |
| West Nottingham Meetinghouse |
| West Nottingham Presbyterian Church Complex |
| West St. Mary's Manor |
| Whitehall |
| White Hall |
| White Hall |
| Whitehaven Hotel |
| White House Farm |
| Widehall |
| Widrick, George, House |
| Wilderness, The |
| Wildfell |
| Wiley-Ringland House |
| Wilkens-Robins Building |
| Willard, George,House |
| Williams' Conquest |
| Williams Grove |
| Williams Plains |
| Williston Mill Historic District |
| Willow Glenn |
| Willow Grove |
| Willows, The |
| Wilson-Miller Farm |
| Wilson, Rufus, Complex |
| Wilson School |
| Wilson's Inheritance |
| Wilton |
| Winemiller Family Farm |
| Winsted |
| Woburn Manor |
| Wolfe, James K.P., House |
| Woman's Industrial Exchange |
| Woodend |
| Woodland Hall |
| Woodlands |
| Woodlawn |
| Woodlawn |
Data from United States Park Service and Wikidata
