Built during 1870s

101 Algoma Boulevard (Winnebago County, Wisconsin)
Italianate building with Gothic revival details, still in use on a daily basis
1210-1214 Main Street (Richland County, South Carolina)
1879 Houston Waterworks (Harris County, Texas)
A. B. Chace Rowhouses (Bristol County, Massachusetts)
A. Berding House (Humboldt County, California)
A. E. Chambers Octagonal Barn (Boone County, Kentucky)
A. F. Chapman House (Schuyler County, New York)
A. H. Stephens Memorial State Park (Taliaferro County, Georgia)
A. I. And E. R. Root Homestead (Medina County, Ohio)
A. J. Clark Store (Orange County, New York)
A. J. Jernigan House (Travis County, Texas)
A. J. Schwartz House (Saline County, Kansas)
A. Larson & Co. Building (Kandiyohi County, Minnesota)
A. Newton Farm (Jefferson County, New York)
A. T. Stewart Era Buildings (Nassau County, New York)
A.D. Strickland Store (Whitfield County, Georgia)
Abbot Hall (Essex County, Massachusetts)
Abbotsford (Suffolk County, Massachusetts)
Abell Farmhouse and Barn (Madison County, New York)
Abenicio Salazar Historic District (Sandoval County, New Mexico)
Aberdeen Historic District (Moore County, North Carolina)
Abner C. Johnson House (Genesee County, Michigan)
Abner L. Harris House (Sauk County, Wisconsin)
French Second Empire House with Mansard Roof Disguising a Third Story
Abraham Anthony Farm (Catawba County, North Carolina)
Abraham Castetter House (Washington County, Nebraska)
Abraham Curry House (Carson City, Nevada)
Abram and Sallie Printz Farm (Page County, Virginia)
Abram Emery House (Muskingum County, Ohio)
Abram Gaar House and Farm (Wayne County, Indiana)
Academy Building (Bristol County, Massachusetts)
Acre (The) (Cheshire County, New Hampshire)
Adam and Mary Smith House (Dane County, Wisconsin)
Adam Weyer Wagon Shop (Rice County, Minnesota)
Adam-Derby House (Nassau County, New York)
Adams County Courthouse (Adams County, Indiana)
Adams Covered Bridge (Morgan County, Ohio)
Covered bridge over San Toy Creek on San Toy Road south of Portersville
Adams Mill Covered Bridge (Carroll County, Indiana)
Covered bridge over Wildcat Creek on CR 50 East
Adams-Nervine Asylum (Suffolk County, Massachusetts)
Adams-Pickering Block (Penobscot County, Maine)
Adas Israel Synagogue (Washington, District of Columbia)
Adath Israel Cemetery (Jefferson County, Kentucky)
Adolph A. Erhard House (Bastrop County, Texas)
Adolphus W. Brower House (De Kalb County, Illinois)
Adrian Edwards Conn House (Blanco County, Texas)
Aetna Station No. 5 (Fond du Lac County, Wisconsin)
Repurposed fire station now serving as a private office
African Zion Baptist Church (Kanawha County, West Virginia)
Ailsa Farms (Passaic County, New Jersey)
Ainapo Trail (Hawaii County, Hawaii)
Airy Castle (Bourbon County, Kentucky)
Albert Palmer House (Shiawassee County, Michigan)
Albert Swain Bryson House (Macon County, North Carolina)
Albin B. Swindell House and Store (Hyde County, North Carolina)
Alcorn State University Historic District (Claiborne County, Mississippi)
Alden Bryan House (Scott County, Iowa)
Alden--Delahanty Block (Worcester County, Massachusetts)
Alexander and Elizabeth Aull Graves House (Lafayette County, Missouri)
Alexander Clark House (Muscatine County, Iowa)
Alexander Grzelachowski House and Store (Guadalupe County, New Mexico)
Alexander Harkin Store (Nicollet County, Minnesota)
Alexander Smith Carpet Mills Historic District (Westchester County, New York)
Alexander St. Clair House (Tazewell County, Virginia)
Alexander Wade House (Monongalia County, West Virginia)
Alexandria City Hall (Alexandria, Virginia)
Alford--Nielson House (Humboldt County, California)
Alford-Little House (Copiah County, Mississippi)
Alfred H. Bordelon House (Avoyelles Parish, Louisiana)
Alfred Hebard House (Montgomery County, Iowa)
Alfred M. Bergere House (Santa Fe County, New Mexico)
Alfred Steinheim Museum (Allegany County, New York)
Alfred W. McCune Mansion (Salt Lake County, Utah)
Alfred William Harper House (Utah County, Utah)
Algernon S. Paddock House (Gage County, Nebraska)
Aliiolani Hale (Honolulu County, Hawaii)
Alkemeyer Commercial Buildings (Hamilton County, Ohio)
All Saints' Chapel (Ulster County, New York)
All Saints' Episcopal Church (Allegan County, Michigan)
All Souls Church (Kennebec County, Maine)
Allen, Charles, House (Worcester County, Massachusetts)
Alma Staker House (Sanpete County, Utah)
Almand--O'Kelley--Walker House (Rockdale County, Georgia)
Almer Store (Phillips County, Arkansas)
Alms and Doepke Dry Goods Company (Hamilton County, Ohio)
Alois and Annie Weber House (Lee County, Iowa)
Aloys Bilz House (Ottawa County, Michigan)
Alpha Charles Childs House (Lake County, Ohio)
Alpheus Gay House (Hillsborough County, New Hampshire)
Alphonse Calhoun Avery House (Burke County, North Carolina)
Alpine Hose Company No. 2 (Clear Creek County, Colorado)
Alpine Tunnel Historic District (Unspecified county, Colorado)
Abandoned tunnel under the Continental Divide on the Denver, South Park & Pacific Railroad, southwest of St. Elmo
Alston House (Richland County, South Carolina)
Alta Vista Cemetery (Hall County, Georgia)
Alvah A. Heald House (Polk County, Wisconsin)
Amboy Illinois Central Depot (Lee County, Illinois)
Ambrose Hopkinson House (Richland County, Illinois)
American Exchange Bank (Dane County, Wisconsin)
American Flag Post Office Ranch (Pinal County, Arizona)
American Museum of Natural History (New York County, New York)
American Net and Twine Company Factory (Middlesex County, Massachusetts)
American Tobacco Company Manufacturing Plant (Durham County, North Carolina)
American Watch Tool Company (Middlesex County, Massachusetts)
Amherst County Courthouse (Amherst County, Virginia)
Amos Block (Onondaga County, New York)
Amos Kelly House (Crawford County, Pennsylvania)
Anderson Camp Ground (Anderson County, Texas)
Anderson Downtown Historic District (Anderson County, South Carolina)
Historic commercial district in Anderson, SC
Anderson Hall (Riley County, Kansas)
Anderson Homestead (Clay County, South Dakota)
Anderson Schoolhouse (Ashland County, Ohio)
Andrew and Jennie McFarlane House (Westmoreland County, Pennsylvania)
Andrew Barentsen House (Sanpete County, Utah)
Andrew C. Vaughn House (Williamson County, Tennessee)
Andrew Dall Jr. and James, Houses (Cuyahoga County, Ohio)
Andrew Dickson White House (Tompkins County, New York)
Andrew Frame House (Waukesha County, Wisconsin)
Andrew Hunter House (Saline County, Arkansas)
Andrew J. Landrum House (Santa Clara County, California)
Andrew Jackson House (Summit County, Ohio)
Andrew Powell Homestead (Hancock County, Ohio)
Andrew Warren Historic District (Marathon County, Wisconsin)
Andrew Wilcox House (Jackson County, Michigan)
Andrew Young House (Clatsop County, Oregon)
Andrew-Ryan House (Dubuque County, Iowa)
Andrews Methodist Church (Taylor County, West Virginia)
Anger's Block (Winona County, Minnesota)
Anhalt Barn (Logan County, Arkansas)
Anheuser-Busch Brewery (St. Louis, Missouri)
Ann Charlotte and Jacob Hinkel House (Ramsey County, Minnesota)
Annie Birch House (Summit County, Utah)
Annie Palmer House (Mendocino County, California)
Annie Tallent House (Meade County, South Dakota)
Anthony Hockman House (Harrisonburg, Virginia)
Anthony Reckless Estate (Monmouth County, New Jersey)
Anthony Yoerg Sr., House (Ramsey County, Minnesota)
Antigo Public Library and Deleglise Cabin (Langlade County, Wisconsin)
Antioch Baptist Church - c1876 (Gilmer County, Georgia)
Antioch Missionary Baptist Church (Harris County, Texas)
Antioch School (Jones County, Iowa)
One room schoolhouse where Grant Wood attended grade school in his early years
Antique Store (Dallas County, Alabama)
Anton Gogala Farmstead (Stearns County, Minnesota)
Antonio Maria Peralta House (Alameda County, California)
Antonio Vigil House (Bernalillo County, New Mexico)
Apex Historic District (Wake County, North Carolina)
Appin (Marlboro County, South Carolina)
Arcade Building (Cook County, Illinois)
Arch and Ridge Streets Historic District (Marquette County, Michigan)
Arch Street Opera House (Philadelphia County, Pennsylvania)
Archbishop Lamy's Chapel (Santa Fe County, New Mexico)
Arendt--Seymour House (Franklin County, Ohio)
Arlington Coal & Lumber (Middlesex County, Massachusetts)
Armory Square Historic District (Onondaga County, New York)
Armstrong House (Berkshire County, Massachusetts)
Armstrong-Walker House (New Castle County, Delaware)
Arnett-Fullen House (Boulder County, Colorado)
Arnold Arboretum (Suffolk County, Massachusetts)
Arnold Print Works (Berkshire County, Massachusetts)
Art Gallery Building (St. Joseph County, Michigan)
Arthur W. Wright House (Mower County, Minnesota)
Arts and Industries Building (Washington, District of Columbia)
Artz House (Franklin County, Ohio)
Arvada Downtown (Jefferson County, Colorado)
Asahel Bush House (Marion County, Oregon)
Ash Street School (Hillsborough County, New Hampshire)
Ashburn Presbyterian Church (Loudoun County, Virginia)
Ashcroft, Colorado (Pitkin County, Colorado)
Ashe House (Hardin County, Kentucky)
Asher Brand Residence (Franklin County, Ohio)
Ashland Cemetery (Jackson County, Oregon)
Ashland Junior High School (Grafton County, New Hampshire)
Ashland Town Hall (Grafton County, New Hampshire)
Ashtabula Harbour Commercial District (Ashtabula County, Ohio)
Ashville Depot (Pickaway County, Ohio)
Ashville Historic District (Fauquier County, Virginia)
Ashworth and Jones Factory (Worcester County, Massachusetts)
Assateague Beach Coast Guard Station (Accomack County, Virginia)
Assay Office (Ada County, Idaho)
Assembly of Exempt Firemen Building (Hudson County, New Jersey)
Atherton Bridge (Worcester County, Massachusetts)
Atkins and Smith House (Beaver County, Utah)
Atkinson Road Bridge (Bucks County, Pennsylvania)
Stone arch bridge over Pidcock Creek on Atkinson Road in Solebury Twp, East of Lahaska, PA. Bucks County Bridge # 305, PA
Atlanta Historic District (Elmore County, Idaho)
Attleborough Falls Gasholder Building (Bristol County, Massachusetts)
Au Sable Light Station (Alger County, Michigan)
Audubon County Courthouse (Audubon County, Iowa)
August Baron House (Bastrop County, Texas)
August Tonn Farmstead (Douglas County, Minnesota)
August Zeppenfeld House (Johnson County, Indiana)
Augusta Presbyterian Church (Woodruff County, Arkansas)
Augustus Garland House (Pulaski County, Arkansas)
Augustus Lilly House (Allegan County, Michigan)
Augustus Paddock House (Kent County, Michigan)
Auraria 9th Street Historic District (Denver County, Colorado)