Built during 1860s

2 1/2 Beacon Street (Merrimack County, New Hampshire)
75 Murray Street Building (New York County, New York)
A. V. Peters House (Lane County, Oregon)
A.A. Brant House (Ocean County, New Jersey)
A.D. (Boss) Jones House (Schenectady County, New York)
A.G. Tuttle Estate (Sauk County, Wisconsin)
Aaron Ferrey House (Portage County, Ohio)
Abel Brockway House (Saginaw County, Michigan)
Abner Davison House (Scott County, Iowa)
Abraham and Mary Wigle House (Linn County, Oregon)
Abraham Groesbeck House (Cook County, Illinois)
Abram C. Fisk House (Branch County, Michigan)
Absalom Lowe Landis House (Bedford County, Tennessee)
Absalom Thompson House (Maury County, Tennessee)
Absolom Riggs House (DeKalb County, Missouri)
Academy Grove Historic District (Somerset County, Maryland)
Adairs Covered Bridge (Perry County, Pennsylvania)
Covered bridge over Shermans Creek on PA 3008
Adaland (Barbour County, West Virginia)
Adam Lobell House (Livingston Parish, Louisiana)
Adams Academy (Norfolk County, Massachusetts)
Adams, John E., House (Providence County, Rhode Island)
Adin Randall House (Eau Claire County, Wisconsin)
White frame house that belonged to one of Eau Claire's founding fathers
Administration Building--Post Hospital (Muskogee County, Oklahoma)
African Cemetery (Westchester County, New York)
African Cemetery No. 2 (Fayette County, Kentucky)
Ahnapee Brewery (Kewaunee County, Wisconsin)
Former brewery now a popular winery, open for tours
Ailes House (Copiah County, Mississippi)
Akron Rural Cemetery Buildings (Summit County, Ohio)
Historic Gothic Cemetery and Supporting Buildings
Alabaster Historic District (Iosco County, Michigan)
Alanson M. Kimball House (Waushara County, Wisconsin)
Campus of mid 19th Century buildings centered on a 2-1/2 story frame residence
Albany Custom Mill (Linn County, Oregon)
Wood frame flour mill built 1866
Albany Iron Works, Pattern Shop (Linn County, Oregon)
Brick foundry building constructed 1867
Alberry Wasson Homeplace (Claiborne Parish, Louisiana)
Albert Field Tack Company (Bristol County, Massachusetts)
Alcovy Road Grist Mill (Gwinnett County, Georgia)
Alden Hatch Steele House (Thurston County, Washington)
Aldrich Building (Kent County, Michigan)
Aldrich-Genella House (Orleans Parish, Louisiana)
Alexander Clemons House (Ottawa County, Ohio)
Alexander Cook House (Waukesha County, Wisconsin)
Gothic Revival, 1865 house of ashlar stone
Alexander Noble House (Door County, Wisconsin)
Alexander Ramsey House (Ramsey County, Minnesota)
Alexandria National Cemetery (Alexandria, Virginia)
Alexandria National Cemetery (Rapides Parish, Louisiana)
Alibi Club (Washington, District of Columbia)
Alkali Flat West Historic District (Sacramento County, California)
All Saints Church--Episcopal (Rice County, Minnesota)
All Saints Memorial Church (Providence County, Rhode Island)
All Saints' Episcopal Cathedral Complex (Milwaukee County, Wisconsin)
Edward Townsend Mix designed complex of cathedral and diocese buildings
All Saints' Memorial Church Complex (Monmouth County, New Jersey)
Allegheny Commons (Allegheny County, Pennsylvania)
Allen and Millard Bank (Madison County, Montana)
Allen Street Historic District (Providence County, Rhode Island)
Allen--Sommer--Gage House (Butte County, California)
Allensville Historic District (Todd County, Kentucky)
Allison Plantation (York County, South Carolina)
Alma Crosby House (Beaver County, Utah)
Almshouse, The (Richmond, Virginia)
Alphonse T. Sengele House (Victoria County, Texas)
Alves Historic District (Henderson County, Kentucky)
Alvord I. Smith House (Scott County, Iowa)
Alward Farmhouse (Somerset County, New Jersey)
Amaziah and Cornelia (Wait) Cannon House (Cerro Gordo County, Iowa)
Ambrose Cory House (Seneca County, Ohio)
Ambrose Wager House (Dutchess County, New York)
Octagon House built in 1860
Amelia Earhart Birthplace (Atchison County, Kansas)
American Cemetery (Kodiak Island Borough, Alaska)
American Thermos Bottle Company Laurel Hill Plant (New London County, Connecticut)
Amos Catlin Spafford House (Winnebago County, Illinois)
Amos Gould House (Shiawassee County, Michigan)
Amos Shinkle Summer Residence (Kenton County, Kentucky)
Amsterdam City Hall (Montgomery County, New York)
Anaconda Hotel (Madison County, Montana)
Anchorage, The (Jefferson County, Kentucky)
Anderson Hall (Blount County, Tennessee)
Anderson House (Wilkes County, Georgia)
Anderson House and Store (Bell County, Texas)
Anderson-Smith House (McCracken County, Kentucky)
Restored Civil War Era mansion now serving as a welcome center/rest area
Andersonville National Historic Site (Sumter County, Georgia)
Confederate prison camp and POW museum
Andersonville National Historic Site (Unspecified county, Georgia)
Andrew James Morris House (Beaver County, Utah)
Andrew James Wardlaw House (Warren County, Kentucky)
Andrew Lovelace Jr., House (Ballard County, Kentucky)
Andrew Peterson Farmstead (Carver County, Minnesota)
Andrew Seagle Farm (Lincoln County, North Carolina)
Andrew Thomas House (Carroll County, Indiana)
Androscoggin Mill Block (Androscoggin County, Maine)
Anna Beir House (Darke County, Ohio)
Anna Lyon House - McKeen Place (Madison County, Montana)
Annan Grist Mill (Whiteside County, Illinois)
Annunciation Church (Harris County, Texas)
Ansel T. Walling House (Pickaway County, Ohio)
Anson Wilson House (Jackson County, Iowa)
Anthonv W. Bessey House (Sanpete County, Utah)
Antietam National Battlefield (Washington County, Maryland)
Anton Wagner Duplex (Sacramento County, California)
Apostolic Bethlehem Temple Church (Hamilton County, Ohio)
Archibald D. Fort Hill and Butterfield House (Humphreys County, Tennessee)
Archibald M. Kennedy House (Rush County, Indiana)
Arlington (Carbon County, Wyoming)
Arlington Mills Historic District (Essex County, Massachusetts)
Arlington Street Church (Suffolk County, Massachusetts)
Armistead Burt House (Abbeville County, South Carolina)
Armour's Warehouse (LaSalle County, Illinois)
Armour-Stiner House (Westchester County, New York)
Armstrong Cork Company (Lancaster County, Pennsylvania)
Armstrong County Courthouse and Jail (Armstrong County, Pennsylvania)
Armstrong-Adams House (Bell County, Texas)
Arnold--Harrell House (Rutherford County, Tennessee)
Arnold-Callaway Plantation (Wilkes County, Georgia)
Arthur J. Jones House (Pulaski County, Arkansas)
Arthur Silliman House (St. Joseph County, Michigan)
Asbury Methodist Church (Robeson County, North Carolina)
Ash Street School (Worcester County, Massachusetts)
Ashcroft (Ontario County, New York)
Asher Morton Farmstead (Edgar County, Illinois)
Ashland (Prince George's County, Maryland)
Ashland Bridge (New Castle County, Delaware)
Town lattice covered bridge over Red Clay Creek
Ashpole Presbyterian Church (Robeson County, North Carolina)
Ashton--Driggs House (Utah County, Utah)
Ashuelot Covered Bridge (Cheshire County, New Hampshire)
Covered bridge over Ashuelot River on Gunn Mountain Road in Winchester
Ashworth-Remillard House (Santa Clara County, California)
Assateague Lighthouse (Accomack County, Virginia)
Assumption School (Ramsey County, Minnesota)
Astor House Hotel (Jefferson County, Colorado)
Athens State Hospital (Athens County, Ohio)
Atlanta University Center District (Fulton County, Georgia)
Attawaugan Manufacturing Company Mill (Windham County, Connecticut)
Brick mill with dormered gable roof and off-center stair tower in Killingly.
Auburn Historic District (Logan County, Kentucky)
Augspurger Grist Mill (Butler County, Ohio)
Augspurger Schoolhouse (Butler County, Ohio)
August and Margaretha Rehnstrom House (Henry County, Illinois)
August Bepler House (Hamilton County, Ohio)
August Bloedner Monument (Jefferson County, Kentucky)
August Kuehn House (Vanderburgh County, Indiana)
August Sehrt House (St. Charles County, Missouri)
Augusta Harmonie Verein (St. Charles County, Missouri)
Augustus Caesar Dodge House (Des Moines County, Iowa)
Augustus S. Tryon House (Genesee County, New York)
An intact example of 19th Century Italianate design
Augustus Sander House (Benton County, Missouri)
Ault Store (Rice County, Minnesota)
Aurora (Mineral County, Nevada)
Aurora Colony Ox Barn (Marion County, Oregon)
Clapboard barn built in 1863
Auroraville Fountain (Waushara County, Wisconsin)
Well bored for convenience of travelers and their horses
Austin Cemetery (Lander County, Nevada)
Austin City Hall (Lander County, Nevada)
Austin Historic District (Lander County, Nevada)
Austin Masonic and Odd Fellows Hall (Lander County, Nevada)
Austin McDowell House (Franklin County, Ohio)
Austin Methodist Church (Lander County, Nevada)
Averasboro Battlefield Historic District (Harnett County, North Carolina)
Aydelott House (Jefferson County, Kentucky)
Ayer, Albert, House (Middlesex County, Massachusetts)
Aztec Grist Mill (Colfax County, New Mexico)
B & O Bridge (Washington County, Maryland)
B'er Chayim Temple (Allegany County, Maryland)
B. C. Wandell House--The Cedars (Bergen County, New Jersey)
Babcock Block (Worcester County, Massachusetts)
Demolished to make way for Sky Mark Tower.
Baca House and Outbuilding (Las Animas County, Colorado)
Bagby--Hossler House (Seneca County, Ohio)
Bailey Hill Civil War Earthworks (Hinds County, Mississippi)
Bailey's Dam Site (Rapides Parish, Louisiana)
Bailey-Estes House (Wake County, North Carolina)
Baileys Harbor Range Light (Door County, Wisconsin)
Ballouville Mill (Windham County, Connecticut)
Four-story stucco and rubble-walled mill, one of three of the Attawaugan Manufacturing Co. in Killingly.
Bals-Wocher House (Marion County, Indiana)
Baltimore and Ohio Railroad Martinsburg Shops (Berkeley County, West Virginia)
Baltimore City Hall (Baltimore, Maryland)
Bancroft, Wendell, House (Middlesex County, Massachusetts)
Bandera County Courthouse and Jail (Bandera County, Texas)
Bandera's First Bank (Bandera County, Texas)
Bangor Children's Home (Penobscot County, Maine)
Bankard-Gunther Mansion (Baltimore, Maryland)
Banks County Courthouse (Banks County, Georgia)
Bannack Historic District (Beaverhead County, Montana)
Banning House (Los Angeles County, California)
Baptist Church of Springville, The (Erie County, New York)
Barber Hill Schoolhouse (Hartford County, Connecticut)
Built in 1861. Dismantled at its Griffin Road location and restored in 2017.
Barber Shop (Erie County, Ohio)
Barbour, Lucius, House (Hartford County, Connecticut)
Barclay House (Chester County, Pennsylvania)
Bardavon 1869 Opera House (Dutchess County, New York)
The oldest operating theater in New York state.
Barnard's Mill (Somervell County, Texas)
Barnes--Peery House (Jefferson County, Colorado)
Barney L. Ford Building (Denver County, Colorado)
Barr House (Champaign County, Ohio)
Barrancas National Cemetery (Escambia County, Florida)
Barret House (Henderson County, Kentucky)