Maryland - Significance region: Local
| Truman's Place |
| Trumpington |
| Truog, George, House |
| Tull, William T., House |
| Turkey Hill |
| Turkey Point Light Station |
| Turner-White Casket Co. Building |
| Tuscany-Canterbury Historic District |
| Twin Oaks |
| Tyrconnell |
| Union Baptist Church |
| Union Bridge Historic District |
| Union Chapel |
| Union Grove Schoolhouse |
| Union Square-Hollins Market Historic District |
| Union Station, WI-150 |
| Uniontown Historic District |
| United States Parcel Post Station |
| United States Post Office |
| Universal Lodge No. 14 |
| University Park Historic District |
| Upper Fairmount Historic District |
| Upper Fells Point Historic District |
| Upper Marlboro Residential Historic District |
| Upton |
| U.S. Atomic Energy Commission |
| US Post Office-Hyattsville Main |
| Valhalla |
| Valley Cottage |
| Villa Anneslie |
| Villa DeSales |
| Vineyard, The |
| Waddy House |
| Wailes, F. Leonard, Law Office |
| Walters Bath No. 2 |
| Ward Brothers' House and Shop |
| Warfield Complex, Hubner, and T Buildings |
| Waterloo |
| Waters' River |
| Watkins Point Farm |
| Waverly |
| Waverly Main Street Historic District |
| Webster's Forest |
| Weiskittel-Roehle Burial Vault |
| Wesley Chapel Methodist Episcopal Church |
| West Denton Warehouse-Wharf |
| Western Fields |
| Western Maryland College Historic District |
| Western Maryland Railway, Cumberland Extension Right-of-Way, Mile 126 to Mile 159.8 |
| Western Maryland Railway Steam Locomotive No. 202 |
| Wester Ogle |
| West Montgomery Avenue Historic District |
| West Nottingham Academy Historic District |
| West Nottingham Presbyterian Church Complex |
| West Riverdale Historic District |
| Whitaker's Mill Historic District |
| Whiteford-Cardiff Historic District |
| White Hall |
| White Hall |
| Whitehaven Historic District |
| Whitehaven Hotel |
| White House Farm |
| Widrick, George, House |
| Wiley-Ringland House |
| Wilkens-Robins Building |
| Willard, George,House |
| Williams' Conquest |
| Williams Grove |
| Williams Plains |
| Williamsport Historic District |
| Williston Mill Historic District |
| Willows, The |
| Wilson-Miller Farm |
| Wilson, Rufus, Complex |
| Wilson School |
| Wilson's Inheritance |
| Wilton |
| Windsor Hills Historic District |
| Winemiller Family Farm |
| Winsted |
| Winters Lane Historic District |
| Woburn Manor |
| Wolfe, James K.P., House |
| Woodberry Historic District |
| Woodland Hall |
| Woodlands |
| Woodlawn |
| Woodlawn |
| Woods Mill Farm |
| Woodstock |
| Woodview |
| Woodwardville |
| Worsell Manor |
| Wye Mill |
| Wye Town Farm House |
| Wyoming |
| Young Men's and Young Women's Hebrew Association Building |
| Young-Sartorius House |
| Zion Lutheran Church |
Data from United States Park Service and Wikidata
