109-115 Wood Street (Allegheny County, Pennsylvania)
1767 Milestones (Unspecified county, Massachusetts)
26th District Police and Patrol Station (Philadelphia County, Pennsylvania)
746 Buildings at 744 748, 750 Broadway (Albany County, New York)
75th Police Precinct Station House (Kings County, New York)
A. B. Sears House (Morrow County, Ohio)
A. I. And E. R. Root Homestead (Medina County, Ohio)
A. R. Webber House (Lorain County, Ohio)
Aaron James Eaton House (Weld County, Colorado)
Abbot, Edwin, House (Middlesex County, Massachusetts)
Aberdeen Downtown Historic District (Monroe County, Mississippi)
Abilene Historic District #1 (Dickinson County, Kansas)
Abo (Torrance County, New Mexico)
Abraham Bisson House (Scott County, Minnesota)
Abraham Curry House (Carson City, Nevada)
Abraham J. Friedlander House (Hamilton County, Ohio)
Abraham Ulyatt House (Cuyahoga County, Ohio)
Abram Ackerman House (Bergen County, New Jersey)
Abram Demaree House (Bergen County, New Jersey)
Abram Hatch House (Wasatch County, Utah)
Academy Building (Bristol County, Massachusetts)
Academy Hall (Hartford County, Connecticut)
Academy Hill Historic District (Essex County, Massachusetts)
Academy Hill Historic District (Monroe County, Pennsylvania)
Academy Historic District (Hampden County, Massachusetts)
Academy of Music (Philadelphia County, Pennsylvania)
Academy of the Sacred Heart (Wayne County, Michigan)
Academy Street Historic District (Dutchess County, New York)
Achenbach House (Bergen County, New Jersey)
Ackerman House (Bergen County, New Jersey)
Ackerman-Boyd House (Bergen County, New Jersey)
Ackerman-Dater House (Bergen County, New Jersey)
Ackerman-Demarest House (Bergen County, New Jersey)
Ackerman-Hopper House (Bergen County, New Jersey)
Ackerman-Van Emburgh, House (Bergen County, New Jersey)
Ackerman-Zabriskie-Steuben House (Bergen County, New Jersey)
Ada Odd Fellows Temple (Ada County, Idaho)
Adair County Courthouse (Adair County, Missouri)
Adam Fisher Homestead (Westmoreland County, Pennsylvania)
Adam Howard House (Crawford County, Ohio)
Adam Rider House (Muskingum County, Ohio)
Adam Vandelinda House (Bergen County, New Jersey)
Adams County Courthouse (Adams County, Colorado)
Adams County Courthouse (Adams County, Indiana)
Adams Hotel (Golden Valley County, Montana)
Adams-Gray House (Coshocton County, Ohio)
Addison Lord House (Lorain County, Ohio)
Adele Ilfeld Auditorium (San Miguel County, New Mexico)
Adrian Public Library (Lenawee County, Michigan)
Aftermath Clubhouse (Whatcom County, Washington)
Agnes M. Tamblyn House (Nez Perce County, Idaho)
Agricultural Heating station (Dane County, Wisconsin)
Aiken House (Rensselaer County, New York)
Akron Public Library (Summit County, Ohio)
Beaux Arts style Carnegie Library until 1980, now a private office building
Alameda Free Library (Alameda County, California)
Alanson Pomeroy House (Cuyahoga County, Ohio)
Albany Academy (Albany County, New York)
Albert Baird Cummins House (Polk County, Iowa)
Albert Cofta Farmstead (Summit County, Ohio)
Albert J. Zabriskie Farmhouse (Bergen County, New Jersey)
Albert Neukom House (Lucas County, Ohio)
Albert W. Henn Mansion (Cuyahoga County, Ohio)
Albion Methodist Church (Cassia County, Idaho)
Albrecht C. Ringling House (Sauk County, Wisconsin)
Alex and Mary Alice Johnson House (Tooele County, Utah)
Alexander B. Griffin House (Portage County, Ohio)
Alexander Briggs House (Coles County, Illinois)
Alexander Brown House (Onondaga County, New York)
Alexander Grzelachowski House and Store (Guadalupe County, New Mexico)
Alexander Kelly House (Moore County, North Carolina)
Alexander P. and James S. Waugh House (Mercer County, Pennsylvania)
Alexander W. Livingston House (Franklin County, Ohio)
Alexander Young Building (Honolulu County, Hawaii)
Alexandria National Cemetery (Alexandria, Virginia)
Alfred and Clara Sevareid House (McHenry County, North Dakota)
Alfred L. Black House (Whatcom County, Washington)
Alfred Steinheim Museum (Allegany County, New York)
Alfred W. McCune Mansion (Salt Lake County, Utah)
Alice Paul Birthplace (Burlington County, New Jersey)
Alkemeyer Commercial Buildings (Hamilton County, Ohio)
All Saints Memorial Church (Providence County, Rhode Island)
All Saints' Church (Suffolk County, Massachusetts)
All Saints' Memorial Church Complex (Monmouth County, New Jersey)
All Souls Universalist Church (Riverside County, California)
Allegheny Aqueduct (Berks County, Pennsylvania)
Allegheny Baptist Church (Venango County, Pennsylvania)
Allegheny Cemetery (Allegheny County, Pennsylvania)
Allen Beaumont J., House (Pueblo County, Colorado)
Allen County Courthouse (Allen County, Ohio)
Allen Welton House (Summit County, Ohio)
Allgates (Delaware County, Pennsylvania)
Alta Public Library (Cuyahoga County, Ohio)
Altgeld Hall, University of Illinois (Champaign County, Illinois)
Alvarado Terrace Historic District (Los Angeles County, California)
Amana Villages (Iowa County, Iowa)
Amasa Historic Business District (Iron County, Michigan)
Ambassador Apartments (Multnomah County, Oregon)
Amelia S. Givin Free Library (Cumberland County, Pennsylvania)
American Brewery (Baltimore, Maryland)
American Exchange Bank (Dane County, Wisconsin)
American Fork City Hall (Utah County, Utah)
American Legion Hall (Lincoln County, Idaho)
American Legion Hall (White County, Arkansas)
American Legion Hut (Cherokee County, Oklahoma)
American Legion Hut (Oklahoma County, Oklahoma)
American Mills Web Shop (New Haven County, Connecticut)
American Peace Society (Washington, District of Columbia)
Ames Building (Suffolk County, Massachusetts)
Ames Manufacturing Company (Hampden County, Massachusetts)
Amherst Town Hall (Lorain County, Ohio)
Amherst West Cemetery (Hampshire County, Massachusetts)
Amos H. Root Building (Denver County, Colorado)
Anaconda Commercial Historic District (Deer Lodge County, Montana)
Andalusia Commercial Historic District (Covington County, Alabama)
Anderson House (Fergus County, Montana)
Anderson Outkitchen (Bergen County, New Jersey)
Anderson Schoolhouse (Ashland County, Ohio)
Andrew and Jennie McFarlane House (Westmoreland County, Pennsylvania)
Andrew Dall Jr. and James, Houses (Cuyahoga County, Ohio)
Andrew Ferguson House (Coshocton County, Ohio)
Andrew Gantner House (Cooper County, Missouri)
Andrew H. Hopper House (Bergen County, New Jersey)
Andrew J. Warner House (Weber County, Utah)
Andrews, Luman, House (Hartford County, Connecticut)
Andries Thomas Van Buskirk House (Bergen County, New Jersey)
Angel Island, U.S. Immigration Station (Marin County, California)
Angels Landing Trail-West Rim Trail (Washington County, Utah)
Ann E. Lewis Bernhard House (Jefferson County, Ohio)
Ann Street Historic District (Hartford County, Connecticut)
Anna Jarvis House (Taylor County, West Virginia)
Annamede (Lewis County, West Virginia)
Anne Arundel County Free School (Anne Arundel County, Maryland)
Ansel T. Walling House (Pickaway County, Ohio)
Ansonia Library (New Haven County, Connecticut)
Anthony Pitzer Jr., House (Licking County, Ohio)
Antioch Baptist Church (St. Louis, Missouri)
Anton Goreczky House (Ada County, Idaho)
Antrim County Courthouse (Antrim County, Michigan)
Apache State Bank (Caddo County, Oklahoma)
Apartment at 49-51 Spring Street (Hartford County, Connecticut)
Apartment Building at 116 Spruce Street (Missoula County, Montana)
Apex Union Depot (Wake County, North Carolina)
Apostle Islands Lighthouses (Unspecified county, Wisconsin)
Apremont Triangle Historic District (Hampden County, Massachusetts)
Aquia Church (Stafford County, Virginia)
Aquilla Standifird House (Navajo County, Arizona)
Arbaugh's Department Store Building (Ingham County, Michigan)
Arch and Ridge Streets Historic District (Marquette County, Michigan)
Archer County Courthouse and Jail (Archer County, Texas)
Archibald-Vroom House (Bergen County, New Jersey)
Archwood Congregational Church (Cuyahoga County, Ohio)
Ardmore Historic Commercial District (Carter County, Oklahoma)
Arkansas Valley National Bank (Pawnee County, Oklahoma)
Arkoma School (Le Flore County, Oklahoma)
Arlington School (St. Louis, Missouri)
Arlington Street Church (Suffolk County, Massachusetts)
Armory Hall, Fraternal Hall (Pitkin County, Colorado)
Armstrong House (Jackson County, West Virginia)
Arroyo Grande IOOF Hall (San Luis Obispo County, California)
Artelia Anderson Hall (McCracken County, Kentucky)
Arthur Tavern (Oswego County, New York)
Arthur Taylor House (Grand County, Utah)
Arthur, Chester A., House (New York County, New York)
Arts and Industries Building (Washington, District of Columbia)
Asahel Hart Woodruff House (Salt Lake County, Utah)
Asbury White House (Pueblo County, Colorado)
Ash Creek School (Latimer County, Oklahoma)
Ash Fork Maintenance Camp #1 (Yavapai County, Arizona)
Ashburton House (Washington, District of Columbia)
Ashcroft-Merrill Historic District (McKinley County, New Mexico)
Asher Brand Residence (Franklin County, Ohio)
Ashland Avenue Baptist Church (Lucas County, Ohio)
Ashland County Courthouse (Ashland County, Wisconsin)
Classical Revival and Beaux-Arts courthouse in Ashland County
Ashland Middle School (Ashland County, Wisconsin)
Ashland Municipal Powerhouse (Jackson County, Oregon)
Askew Bridge (Berks County, Pennsylvania)
Assay Office (Ada County, Idaho)
Association Residence Nursing Home (New York County, New York)
Aston Inn (Marion County, Indiana)
Astor House Hotel (Jefferson County, Colorado)
Asylum Avenue District (Hartford County, Connecticut)
Athenaeum of Philadelphia (Philadelphia County, Pennsylvania)
Athens Governmental Buildings (Athens County, Ohio)