Federal

1790 House (Middlesex County, Massachusetts)
2000 Block Of Eye Street, NW (Washington, District of Columbia)
746 Buildings at 744 748, 750 Broadway (Albany County, New York)
A. A. Bancroft House (Licking County, Ohio)
A. Eliason House (New Castle County, Delaware)
A. M. Vail House (New Castle County, Delaware)
A. M. Young House (Jessamine County, Kentucky)
A. P. Hill Boyhood Home (Culpeper County, Virginia)
A. T. House (Greene County, New York)
Aaron Aldrich House (Cuyahoga County, Ohio)
Aaron Fagin House (Clermont County, Ohio)
Aaron Kinney House (Scioto County, Ohio)
Aaron Wilson House (Seneca County, New York)
Abbot House (Hillsborough County, New Hampshire)
Abbot-Battles House (Essex County, Massachusetts)
Abbott-Holloway Farm (Clark County, Indiana)
Abbott-Page House (Erie County, Ohio)
Abe Souther House (Boone County, Kentucky)
Abell House (Jefferson County, Kentucky)
Abigail Adams Smith Museum (New York County, New York)
Abijah II O'Neall House (Montgomery County, Indiana)
Abingdon Historic District (Washington County, Virginia)
Abner Cloud House (New Castle County, Delaware)
Abraham Beydler House (Shenandoah County, Virginia)
Abraham Dickerson Farmhouse (Orange County, New York)
Abraham Ditto House (Hardin County, Kentucky)
Abraham Jones House (Frederick County, Maryland)
Abraham Magowan House (Fleming County, Kentucky)
Abrams Plains (Granville County, North Carolina)
Absalom Thompson House (Maury County, Tennessee)
Abyssinian Meeting House (Cumberland County, Maine)
Academy Building (Cumberland County, Maine)
Academy Hall (Hartford County, Connecticut)
Academy Hill Historic District (Essex County, Massachusetts)
Academy, The (Northumberland County, Virginia)
Accomac Historic District (Accomack County, Virginia)
Achilles Eubank House (Clark County, Kentucky)
Acquinsicke (Charles County, Maryland)
Acton Centre Historic District (Middlesex County, Massachusetts)
Acton House (Preble County, Ohio)
Acworth Congregational Church (Sullivan County, New Hampshire)
Adam Fisher Homestead (Westmoreland County, Pennsylvania)
Adams National Historic Site (Norfolk County, Massachusetts)
Adams Street Double House (Erie County, Ohio)
Adams, Benjamin, House (Worcester County, Massachusetts)
Adams, Dr. Daniel, House (Cheshire County, New Hampshire)
Adams--Magoun House (Middlesex County, Massachusetts)
Adams-Ryan House (Monroe County, New York)
Addison Kimball House (Lake County, Ohio)
Adelphi School (Philadelphia County, Pennsylvania)
Adlai E. Stevenson I, House (Woodford County, Illinois)
Admiral's House (New York County, New York)
Adsit Cobblestone Farmhouse (Monroe County, New York)
Adsit House (Steuben County, New York)
Advance Mills Historic District (Albemarle County, Virginia)
African Meetinghouse (Suffolk County, Massachusetts)
Agawam Center Historic District (Hampden County, Massachusetts)
Agler-La Follette House (Franklin County, Ohio)
Aiken House (Rensselaer County, New York)
Aiken Stand Complex (Windsor County, Vermont)
Aiken's Tavern Historic District (New Castle County, Delaware)
Aillet House (West Baton Rouge Parish, Louisiana)
Ainsworth E. Blunt House (Whitfield County, Georgia)
Airville (Gloucester County, Virginia)
Airy Hill (Kent County, Maryland)
Alabama Girls' Industrial School (Shelby County, Alabama)
A women-only technical school that also offered high school-level courses.
Alamo Hotel (El Paso County, Colorado)
Albany Avenue Historic District (Rensselaer County, New York)
Albert Goodin House (Larue County, Kentucky)
Albertus Ledbetter House (McDowell County, North Carolina)
Alcorn State University Historic District (Claiborne County, Mississippi)
Alden, Ebenezer, House (Knox County, Maine)
Alderson Historic District (Unspecified county, West Virginia)
Aldrich, Daniel, Cottage and Sawmill (Worcester County, Massachusetts)
Aldrich, Jacob, House (Worcester County, Massachusetts)
Aldrich, Seth, House (Worcester County, Massachusetts)
Alexander Chene House (Wayne County, Michigan)
Alexander Conner House (Greene County, Ohio)
Alexander Ewing House (Davidson County, Tennessee)
Alexander Kelly House (Moore County, North Carolina)
Alexander P. and James S. Waugh House (Mercer County, Pennsylvania)
Alexander Plantation House (Woodford County, Kentucky)
Alexander Thompson House (Orange County, New York)
Alexander Watson Batte House (Greensville County, Virginia)
Alexander, Simeon, Jr., House (Franklin County, Massachusetts)
Alexandria Historic District (Alexandria, Virginia)
Alfred Historic District (York County, Maine)
Alfred Shaker Historic District (York County, Maine)
Alfred W. Morrison House (Howard County, Missouri)
Allen House (Dubuque County, Iowa)
Allen House (Montgomery County, Tennessee)
Allen, James House (Fayette County, Kentucky)
Allen--Madison House (Washington County, Rhode Island)
Allen-Alexander House (Bourbon County, Kentucky)
Allenstown Meeting House (Merrimack County, New Hampshire)
Allentown Historic District (Monmouth County, New Jersey)
Allenwood Farm (Washington County, Vermont)
Allison, Capt. Samuel, House (Cheshire County, New Hampshire)
Almeron Durkee House (Cayuga County, New York)
Alna School (Lincoln County, Maine)
Alston-DeGraffenried House (Chatham County, North Carolina)
Altamont Historic District (Albany County, New York)
Altona (Jefferson County, West Virginia)
Alvey Cox House (Hart County, Kentucky)
Amasa Day House (Middlesex County, Connecticut)
Ambrose Whittlesey House (Middlesex County, Connecticut)
Ames Academy Building (Montgomery County, New York)
Amherst Central Business District (Hampshire County, Massachusetts)
Amherst Village Historic District (Hillsborough County, New Hampshire)
Amite County Courthouse (Amite County, Mississippi)
Amite Female Seminary (Amite County, Mississippi)
Amos Bristol Tavern (Delaware County, New York)
Amos Bull House (Hartford County, Connecticut)
Amos Cooke House (Providence County, Rhode Island)
Amos Evans House (Burlington County, New Jersey)
Anderson House (Green County, Kentucky)
Anderson House (Botetourt County, Virginia)
Anderson House and Lexington Battlefield (Lafayette County, Missouri)
Anderson-Shaffer House (Butler County, Ohio)
Andover Center Historic District (Tolland County, Connecticut)
Andrew Carpenter House (Gaston County, North Carolina)
Andrew Johnston House (Giles County, Virginia)
Andrew Mann Inn (Otsego County, New York)
Andrew Muldrow Quarters (Woodford County, Kentucky)
Andrew Ten Eyck House (Somerset County, New Jersey)
Andrew Thompson Farmstead (Orange County, New York)
Andrew Welch Homestead (York County, Maine)
Andrew Wylie House (Monroe County, Indiana)
Andrews Bridge Historic District (Lancaster County, Pennsylvania)
Andrews Tavern (Spotsylvania County, Virginia)
Andrews, Lt. Robert, House (Cumberland County, Maine)
Andrews-Moore House (Franklin County, North Carolina)
Angell--Ballou House (Providence County, Rhode Island)
Angles, The (McCracken County, Kentucky)
Ann Cunningham Evans House (Lancaster County, Pennsylvania)
Annas Farmhouse (Madison County, New York)
Annefield (Clarke County, Virginia)
Ansel Clark House (Lorain County, Ohio)
Anthony House (Berkshire County, Massachusetts)
Appomattox Iron Works (Petersburg, Virginia)
Apponaug Historic District (Kent County, Rhode Island)
Araby (Charles County, Maryland)
Archambault House (St. Louis County, Missouri)
Archibald Gracie Mansion (New York County, New York)
Archibald Taylor Plantation House (Granville County, North Carolina)
Archibald Woods House (Mercer County, Kentucky)
Archibald--Adams House (Washington County, Maine)
Arlington (Jefferson County, Alabama)
A former plantation house and 6 acres (24,000 m2) of landscaped gardens near downtown Birmingham, Alabama.
Arlington Center Historic District (Middlesex County, Massachusetts)
Arlington Village Historic District (Bennington County, Vermont)
Armstrong Row (Mason County, Kentucky)
Armstrong-Walker House (New Castle County, Delaware)
Arnheim (Radford, Virginia)
Arnold Homestead (Montgomery County, Ohio)
Arnold Mills Historic District (Providence County, Rhode Island)
Arnold-Palmer House (Providence County, Rhode Island)
Arrow Rock Tavern (Saline County, Missouri)
Arrowhead (Franklin County, Kentucky)
Arsenal House (Oneida County, New York)
Arthur Tavern (Oswego County, New York)
Arts Club of Washington (Washington, District of Columbia)
Arvin Olin House (Portage County, Ohio)
Asa Biggs House and Site (Martin County, North Carolina)
Asa May House (Orange County, Vermont)
Asa Payne House (Scott County, Kentucky)
Asa Stower House (Warren County, New York)
Asa White House (Greene County, Alabama)
A historic house in Eutaw, Alabama.
Asbury Historic District (Unspecified county, New Jersey)
Ascutney Mill Dam Historic District (Windsor County, Vermont)
Ash Emison Quarters (Scott County, Kentucky)
Ashbourne (Jefferson County, Kentucky)
Ashfield Plain Historic District (Franklin County, Massachusetts)
Ashford Academy (Windham County, Connecticut)
Ashland (Vance County, North Carolina)
Ashley House (Bristol County, Massachusetts)
Ashton--Hursh House (York County, Pennsylvania)
Ashville Historic District (St. Clair County, Alabama)
Aspen Hall (Chatham County, North Carolina)
Aspen Lawn (Southampton County, Virginia)
Athens Lower Village Historic District (Greene County, New York)
Atherton Farmstead (Windsor County, Vermont)
Athol (Caroline County, Maryland)
Attica Main Street Historic District (Fountain County, Indiana)
Augusta Downtown Historic District (Richmond County, Georgia)
Augustus Frisbie House (Herkimer County, New York)
Augustus Post House (Tolland County, Connecticut)
Auld--McCobb House (Lincoln County, Maine)
Aurora Buttles House (Franklin County, Ohio)
Aurora Center Historic District (Portage County, Ohio)
Austerlitz (Pointe Coupee Parish, Louisiana)
Avenel (Bedford, Virginia)
Averasboro Battlefield Historic District (Harnett County, North Carolina)
Averitt--Herod House (Trousdale County, Tennessee)
Avery Russell House (Knox County, Tennessee)
Bacon Academy (New London County, Connecticut)
Bacon, Robert, House (Middlesex County, Massachusetts)