109-115 Wood Street (Allegheny County, Pennsylvania)
1616 Building (Philadelphia County, Pennsylvania)
1767 Milestones (Unspecified county, Massachusetts)
2 1/2 Beacon Street (Merrimack County, New Hampshire)
26th District Police and Patrol Station (Philadelphia County, Pennsylvania)
A. C. Foster Building (Denver County, Colorado)
A. C. Jones House (Lexington County, South Carolina)
A.D. Strickland Store (Whitfield County, Georgia)
Abbot Hall (Essex County, Massachusetts)
Abbot, Edwin, House (Middlesex County, Massachusetts)
Abbotsford (Suffolk County, Massachusetts)
Abbott Memorial Library (Penobscot County, Maine)
Abbott Street School (Worcester County, Massachusetts)
Abbott, George S., Building (New Haven County, Connecticut)
Abbott, Jacob, House (Franklin County, Maine)
Demolished 2001
Abenaki Indian Shop and Camp (Carroll County, New Hampshire)
Aberdeen Historic District (Brown County, South Dakota)
Abial Cushman Store (Penobscot County, Maine)
Abner Cloud House (New Castle County, Delaware)
Abraham Lincoln Statue and Park (Fayette County, Iowa)
A unique statue of Abraham Lincoln is the centerpiece of a town park
Academy Building (Bristol County, Massachusetts)
Academy Building (Cumberland County, Maine)
Academy Hill Historic District (Essex County, Massachusetts)
Acona Church Cemetery and School (Holmes County, Mississippi)
Acushnet Heights Historic District (Bristol County, Massachusetts)
Acworth Silsby Library (Sullivan County, New Hampshire)
Adam, J.N.--AM&A Historic District (Erie County, New York)
Adams Academy (Norfolk County, Massachusetts)
Adams and Sickles Building (Mercer County, New Jersey)
Adams Memorial (Washington, District of Columbia)
Adams Memorial Building (Rockingham County, New Hampshire)
Adams, Benjamin, House (Worcester County, Massachusetts)
Adams, Dr. Daniel, House (Cheshire County, New Hampshire)
Adams, Elwood, Store (Worcester County, Massachusetts)
Adams, John, School (Norfolk County, Massachusetts)
Adams-Pickering Block (Penobscot County, Maine)
Aderholdt's Mill (Calhoun County, Alabama)
Administration/Science Building (Maricopa County, Arizona)
Adorno Station (Humboldt County, Nevada)
Afro-American Insurance Company Building (York County, South Carolina)
Ahavas Shalom Reform Temple (Noble County, Indiana)
Ahwahnee Hotel (Mariposa County, California)
Airville (Gloucester County, Virginia)
Akron Cemetery (Independence County, Arkansas)
Alabama and Vicksburg Railroad Depot (Newton County, Mississippi)
Alamo National Bank Building (Bexar County, Texas)
Alamo National Bank Building (Bexar County, Texas)
Albany City Hall (Albany County, New York)
Albany Union Station (Albany County, New York)
Albee, E., House (Worcester County, Massachusetts)
Albert Lea City Hall (Freeborn County, Minnesota)
Albert W. Thompson Hall (Whitman County, Washington)
Albion Historic District (Providence County, Rhode Island)
Albion Walker Chalkrock House (Bon Homme County, South Dakota)
Albrecht C. Ringling House (Sauk County, Wisconsin)
Albree-Hall-Lawrence House (Middlesex County, Massachusetts)
Alderbrook Farmhouse (San Juan County, Washington)
Aldrich, Benjamin, Homestead (Coos County, New Hampshire)
Aldrich, Daniel, Cottage and Sawmill (Worcester County, Massachusetts)
Aldrich, Jacob, House (Worcester County, Massachusetts)
Aldrich, Nathan C., House and Resthaven Chapel (Worcester County, Massachusetts)
Aldrich, Seth, House (Worcester County, Massachusetts)
Alewife Brook Parkway (Middlesex County, Massachusetts)
Alex Brown Building (Baltimore, Maryland)
Alexander Bache U.S. Coast Survey Line (Charleston County, South Carolina)
Alexander Briggs House (Coles County, Illinois)
Alexander, Arad, House (Worcester County, Massachusetts)
Alexander-Cleveland House (Elbert County, Georgia)
Alexandria Residential Historic District (Douglas County, Minnesota)
Alfred Hanson House (Fayette County, Iowa)
Alfred I. DuPont Building (Miami-Dade County, Florida)
Alfred Shaker Historic District (York County, Maine)
Algonquin Printing Co. (Bristol County, Massachusetts)
Alice Lord Goodine House (Caledonia County, Vermont)
All Saints Historic District (Minnehaha County, South Dakota)
All Saints' Chapel (Ulster County, New York)
All Saints' Church (Hillsborough County, New Hampshire)
All Saints' Church (Suffolk County, Massachusetts)
All Saints' Episcopal Church, Waccamaw (Georgetown County, South Carolina)
All Soul's Chapel (Androscoggin County, Maine)
All Souls Church (Pulaski County, Arkansas)
All Souls Church (Kennebec County, Maine)
All Souls Congregational Church (Penobscot County, Maine)
Alldis, James, House (Litchfield County, Connecticut)
Allegheny County Courthouse and Jail (Allegheny County, Pennsylvania)
Allegheny High School (Allegheny County, Pennsylvania)
Allegheny Post Office (Allegheny County, Pennsylvania)
Allen County Courthouse (Allen County, Ohio)
Allen House (Middlesex County, Massachusetts)
Allen, Candace, House (Providence County, Rhode Island)
Allen, Ethan, House and Gun Shop (Worcester County, Massachusetts)
Allen, Stephen, House (Kent County, Rhode Island)
Allen, Zachariah, House (Providence County, Rhode Island)
Allenstown Meeting House (Merrimack County, New Hampshire)
Allentown National Bank (Lehigh County, Pennsylvania)
Allenwood Farm (Washington County, Vermont)
Allie M. Best House (Hart County, Georgia)
Allston Congregational Church (Suffolk County, Massachusetts)
Almshouse (Middlesex County, Massachusetts)
Almshouse (Middlesex County, Massachusetts)
Alna School (Lincoln County, Maine)
Alonzo and Louise Barnett House (Spokane County, Washington)
Alpheus Gay House (Hillsborough County, New Hampshire)
Alpine County Courthouse (Alpine County, California)
Alpine LDS Church Meetinghouse (Utah County, Utah)
Alvin and Annie Green House (Salt Lake County, Utah)
Amberg Town Hall (Marinette County, Wisconsin)
Original Town Hall now part of a block of the Amberg Historical Museum Complex
America's Credit Union Museum (Hillsborough County, New Hampshire)
American Antiquarian Society (Worcester County, Massachusetts)
American Bank Note Company Building (New York County, New York)
American Legion Building (Spartanburg County, South Carolina)
Historic Meeting Hall in Spartanburg, SC
American National Bank (Camden County, New Jersey)
American Net and Twine Company Factory (Middlesex County, Massachusetts)
American Printing Co. and Metacomet Mill (Bristol County, Massachusetts)
American Radiator Building (New York County, New York)
American Security and Trust Company (Washington, District of Columbia)
American Stock Exchange (New York County, New York)
Ames Building (Suffolk County, Massachusetts)
Ames Monument (Albany County, Wyoming)
Ames Schoolhouse (Norfolk County, Massachusetts)
Amesbury Friends Meeting House (Essex County, Massachusetts)
Amherst Central Business District (Hampshire County, Massachusetts)
Amherst Village Historic District (Hillsborough County, New Hampshire)
Amherst West Cemetery (Hampshire County, Massachusetts)
Amis-Elder House (Oglethorpe County, Georgia)
Amos and Lillie Plummer House (Traill County, North Dakota)
Ancient Burying Ground (Barnstable County, Massachusetts)
Ancient Order of Hibernians Hall (Deer Lodge County, Montana)
Anderson Bank Building (Madison County, Indiana)
Anderson Downtown Historic District (Madison County, Indiana)
Andover Public Library (Oxford County, Maine)
Andover Street Historic District (Middlesex County, Massachusetts)
Andover Village Industrial District (Essex County, Massachusetts)
Andrew Carr Sr., House (Ward County, North Dakota)
Andrews, Lt. Robert, House (Cumberland County, Maine)
Andrews, Moses, House (New Haven County, Connecticut)
Andrews--Luther Farm (Providence County, Rhode Island)
Andrews-Moore House (Franklin County, North Carolina)
Androscoggin Mill Block (Androscoggin County, Maine)
Angelo Marre House (Pulaski County, Arkansas)
Angier, John B., House (Middlesex County, Massachusetts)
Anson Grange #88 (Somerset County, Maine)
Ansonia Library (New Haven County, Connecticut)
Antelope Valley Indian Museum (Los Angeles County, California)
Apartments at 2 Collier Road (Fulton County, Georgia)
Apex Historic District (Wake County, North Carolina)
Appleton City Hall (Swift County, Minnesota)
Arcade Building (St. Louis, Missouri)
Arcade Building (Buncombe County, North Carolina)
Arcade, The (Providence County, Rhode Island)
Archibald--Adams House (Washington County, Maine)
Ard Eevin (Los Angeles County, California)
Arizona Pioneers' Home (Yavapai County, Arizona)
Arizona State Capitol Building (Maricopa County, Arizona)
Arlington Memorial Bridge (Washington, District of Columbia)
Arlington Mills Historic District (Essex County, Massachusetts)
Armed Forces Retirement Home--Washington (Washington, District of Columbia)
Armory Block (Berkshire County, Massachusetts)
Armory of the First Corps of Cadets (Suffolk County, Massachusetts)
Armsby Block (Worcester County, Massachusetts)
Armstrong Cork Company (Allegheny County, Pennsylvania)
Army and Navy YMCA (Newport County, Rhode Island)
Arnold, Dexter, Farmstead (Providence County, Rhode Island)
Arnold-Palmer House (Providence County, Rhode Island)
Aroostook County Courthouse and Jail (Aroostook County, Maine)
Arrastra Site (Comanche County, Oklahoma)
Arthur Jordan Memorial Hall (Marion County, Indiana)
Arthur R. Hoard House (Jefferson County, Wisconsin)
Arts and Industries Building (Washington, District of Columbia)
Asbury United Methodist Church (Washington, District of Columbia)
Ascutney Mill Dam Historic District (Windsor County, Vermont)
Ash Street School (Hillsborough County, New Hampshire)
Ashburnham Center Historic District (Worcester County, Massachusetts)
Asheville High School (Buncombe County, North Carolina)
Asheville School (Buncombe County, North Carolina)
Ashland Dam and Spillway (Middlesex County, Massachusetts)
Ashland Junior High School (Grafton County, New Hampshire)
Ashland Middle School (Ashland County, Wisconsin)
Ashland Mill Tenement (Worcester County, Massachusetts)
Ashland Town Hall (Grafton County, New Hampshire)
Ashland Town House (Middlesex County, Massachusetts)
Ashuelot Covered Bridge (Cheshire County, New Hampshire)
Covered bridge over Ashuelot River on Gunn Mountain Road in Winchester
Asilomar Conference Grounds (Monterey County, California)
Aspenvale Cemetery (Smyth County, Virginia)
Astoria Wharf and Warehouse Company (Clatsop County, Oregon)
Atchison County Courthouse (Atchison County, Kansas)
Atherton Bridge (Worcester County, Massachusetts)
Atkinson Building (Androscoggin County, Maine)
Atlanta City Hall (Fulton County, Georgia)