"S" Bridge II (Muskingum County, Ohio)
10th and Cass Streets Neighborhood Historic District (La Crosse County, Wisconsin)
Eclectic collection of 31 homes in La Crosse
1411 Fourth Avenue Building (King County, Washington)
14th Avenue South Bridge (King County, Washington)
Lost bascule bridge over Duwamish River on 14th Avenue South in Seattle
16 Altamont Terrace (Allegany County, Maryland)
1644 Main Street (Richland County, South Carolina)
1724 Chester Courthouse (Delaware County, Pennsylvania)
1761 Milestone (Providence County, Rhode Island)
An historically significant Colonial-era highway marker.
18th Separate Company Armory (Warren County, New York)
190th Street Subway Station (IND) (New York County, New York)
1915 Taylor County Courthouse (Taylor County, Texas)
1926 Republic National Bank (Dallas County, Texas)
19th Street Bridge (Denver County, Colorado)
Two-span wrought-iron through truss bridge over South Platte River on 19th Street in Denver
200--208 Decatur Street (Allegany County, Maryland)
20th Century Club (Washoe County, Nevada)
2nd Baptist Church (Washington, District of Columbia)
303 Saluda Avenue (Richland County, South Carolina)
310 West Church Street Apartments (Duval County, Florida)
32nd St. and Lancaster Ave. Philadelphia Armory (Philadelphia County, Pennsylvania)
33-61 Emerson Place Row (Erie County, New York)
4 Lazy F Dude Ranch (Teton County, Wyoming)
48th Police Precinct Station (Bronx County, New York)
4K Ranch (Stillwater County, Montana)
915 E. Pierce Street/Grand Pyramid House (Maricopa County, Arizona)
A. A. Bancroft House (Licking County, Ohio)
A. Armstrong Farm (New Castle County, Delaware)
A. B. Brewer Building (Stone County, Arkansas)
A. B. C. Dodd House (Floyd County, Iowa)
A. B. Moss Building (Payette County, Idaho)
A. C. Davidson House (Warren County, Kentucky)
A. C. Jeffery Farmstead (Izard County, Arkansas)
A. E. Burckhardt House (Hamilton County, Ohio)
A. E. Chambers Octagonal Barn (Boone County, Kentucky)
A. E. Howard House (Yakima County, Washington)
A. E. Larson Building (Yakima County, Washington)
A. F. Chapman House (Schuyler County, New York)
A. F. R. Building (Bannock County, Idaho)
A. G. Newman House (Lincoln County, Idaho)
A. Goldman Building (Victoria County, Texas)
A. H. Allyn House (Walworth County, Wisconsin)
A. H. Bishop House (Columbia County, Washington)
A. H. Stephens Memorial State Park (Taliaferro County, Georgia)
A. Herr and E. E. Smith Public Library (Iroquois County, Illinois)
A. Hutchings House (Boyle County, Kentucky)
A. J. Aylor House (Boone County, Kentucky)
A. J. Dean House (Flathead County, Montana)
A. J. Gibson House (Missoula County, Montana)
A. J. Harwi House (Atchison County, Kansas)
A. J. Hinds House (Santa Cruz County, California)
A. J. Mason Building (Wagoner County, Oklahoma)
A. J. Schwartz House (Saline County, Kansas)
A. K. Smiley Public Library (San Bernardino County, California)
A. L. Spoon House (Alamance County, North Carolina)
A. M. Detmer House (Hamilton County, Ohio)
A. M. Rothschild & Company Store (Cook County, Illinois)
A. M. Vail House (New Castle County, Delaware)
A. Mendelson and Son Company Building (Albany County, New York)
A. N. Tanner House (Box Elder County, Utah)
A. Newton Farm (Jefferson County, New York)
A. P. Carter Homeplace (Scott County, Virginia)
A. P. Hill Boyhood Home (Culpeper County, Virginia)
A. R. Carroll Building (Washington County, Arkansas)
A. S. Rugge House (Warren County, New York)
A. Smith Bowman Distillery (Fairfax County, Virginia)
A. T. Averill House (Linn County, Iowa)
A. T. Harris House (Woodford County, Kentucky)
A. T. House (Greene County, New York)
A. T. Lewis and Son Department Store (Denver County, Colorado)
A. W. Buck House (Cambria County, Pennsylvania)
A. W. Hawnen House (Williamson County, Texas)
A. W. Pratt House (Johnson County, Iowa)
A.C. Beatie House (Smyth County, Virginia)
A.C. Waltman House (Lewis County, Missouri)
A.K. Wilson Building (Polk County, Oregon)
A.P. Johnson House (Walworth County, Wisconsin)
A.S. Benson House (Larimer County, Colorado)
A.S. Cooper Farm (Ashe County, North Carolina)
A.Z. Palmer House (Navajo County, Arizona)
Aaron Atherton House (Larue County, Kentucky)
Aaron Drumright House (Creek County, Oklahoma)
Aaron Fagin House (Clermont County, Ohio)
Aaron G. Cloud House (Hamilton County, Illinois)
Aaron Kinney House (Scioto County, Ohio)
Aaron Swayzee House (Grant County, Indiana)
Aaron Wilson House (Seneca County, New York)
Aaronsburg Historic District (Centre County, Pennsylvania)
Abbey, The Joaquin Miller House (Alameda County, California)
Abbot, Edwin, House (Middlesex County, Massachusetts)
Abbotsford (Suffolk County, Massachusetts)
Abbott's Creek Primitive Baptist Church Cemetery (Davidson County, North Carolina)
Abbott-Holloway Farm (Clark County, Indiana)
Abe Souther House (Boone County, Kentucky)
Abel and Mary Nicholson House (Salem County, New Jersey)
Abel Bennett Tract Historic District (Broome County, New York)
Abel Colley Tavern (Fayette County, Pennsylvania)
Once a tavern along the National Road
Abell Farmhouse and Barn (Madison County, New York)
Aberdeen City Hall (Monroe County, Mississippi)
Aberdeen Historic District (Brown County, South Dakota)
Abernathy Farm (Giles County, Tennessee)
Abigail Vare School (Philadelphia County, Pennsylvania)
Abijah C. Jay House (Grant County, Indiana)
Abilene Fire Station No. 2 (Taylor County, Texas)
Abington Congregational Church (Windham County, Connecticut)
Abington Farm (Anne Arundel County, Maryland)
Abington Township High School (Montgomery County, Pennsylvania)
Abner C. Johnson House (Genesee County, Michigan)
Abner Knox Farm (Boyle County, Kentucky)
Abner Martin House (Van Buren County, Iowa)
Abner T. Shaw House (Davidson County, Tennessee)
Abner Williams Log House (Noble County, Ohio)
Abner Woodworth House (Yates County, New York)
Abo (Torrance County, New Mexico)
Abraham and Mary Wigle House (Linn County, Oregon)
Abraham Briggs Bowen House (Winnebago County, Wisconsin)
Mid-nineteenth century Italianate mansion
Abraham Glen House (Schenectady County, New York)
Abraham Hegdahl Farm (Lake County, South Dakota)
Abraham Hite House (Jefferson County, Kentucky)
Abraham Houghtaling House (Albany County, New York)
Abraham J. Friedlander House (Hamilton County, Ohio)
Abraham Kellar House (Oldham County, Kentucky)
Abraham Lehman Farmhouse (Franklin County, Ohio)
Abraham Lowenstein House (Shelby County, Tennessee)
Abraham Ulyatt House (Cuyahoga County, Ohio)
Abraham Van Gelder House (Bergen County, New Jersey)
Abraham Wagener House (Yates County, New York)
Abram and Sallie Printz Farm (Page County, Virginia)
Abram C. Fisk House (Branch County, Michigan)
Abram Emery House (Muskingum County, Ohio)
Abram Glenn House (Williamson County, Tennessee)
Abram Huston House and Carriage House (Chester County, Pennsylvania)
Abram's Delight (Winchester, Virginia)
Abrams Plains (Granville County, North Carolina)
Absalom Scales House (Rutherford County, Tennessee)
Absaroka Mountain Lodge (Park County, Wyoming)
Acacia Lodge (Santa Barbara County, California)
Academia Pomeroy Covered Bridge (Juniata County, Pennsylvania)
Covered bridge over Tuscarora Creek southeast of Academia
Academy Hall (Erie County, Pennsylvania)
Academy Hill Historic District (Essex County, Massachusetts)
Academy Hill Historic District (Westmoreland County, Pennsylvania)
Academy of the Sacred Heart (Wayne County, Michigan)
Acadia Ranch (Pinal County, Arizona)
Acadian House (New Haven County, Connecticut)
Acequia Madre (San Miguel County, New Mexico)
Achenbach House (Bergen County, New Jersey)
Achmester (New Castle County, Delaware)
Acker and Evans Law Office (St. Lawrence County, New York)
Ackerman--Dewsnap House (Bergen County, New Jersey)
Ackerman--Smith House (Bergen County, New Jersey)
Ackins House (White County, Arkansas)
Acoa (Habersham County, Georgia)
Acoma (Valencia County, New Mexico)
Acton House (Preble County, Ohio)
Actors Temple (New York County, New York)
Acworth Congregational Church (Sullivan County, New Hampshire)
Acworth Silsby Library (Sullivan County, New Hampshire)
Ad-Lin Building (Lackawanna County, Pennsylvania)
Ada Odd Fellows Temple (Ada County, Idaho)
Ada Public Library (Pontotoc County, Oklahoma)
Ada Thompson Memorial Home (Pulaski County, Arkansas)
Ada Village Hall (Norman County, Minnesota)
Adair County Courthouse (Adair County, Kentucky)
Adair County Courthouse (Adair County, Missouri)
Adair County Courthouse (Adair County, Oklahoma)
Adair Park Historic District (Fulton County, Georgia)
Adaland (Barbour County, West Virginia)
Adam and Mary Smith House (Dane County, Wisconsin)
Brick, Italianate style home built by a prominent citizen
Adam and Minnie Royhl House (Kingsbury County, South Dakota)
Adam C. Arnold Block (Calhoun County, Michigan)
Adam Clarke Nutt Mansion (Fayette County, Pennsylvania)
Adam Dunlap Farmstead (Dane County, Wisconsin)
Adam Hilton House (Albany County, New York)
Adam Monin House (Hardin County, Kentucky)
Adam Sr. Schantz House (Montgomery County, Ohio)
Adam Stephen House (Berkeley County, West Virginia)
Adam, J.N.--AM&A Historic District (Erie County, New York)
Adams Avenue Bridge in Philadelphia (Philadelphia County, Pennsylvania)
Adams Avenue Historic District (Shelby County, Tennessee)
Adams Block (Gallatin County, Montana)
Adams County Courthouse (Adams County, Indiana)
Adams County Courthouse (Adams County, Pennsylvania)
Adams County Courthouse (Adams County, Wisconsin)
Adams County Courthouse (Adams County, North Dakota)
Adams County Jail (Adams County, Iowa)
Adams Covered Bridge (Morgan County, Ohio)
Covered bridge over San Toy Creek on San Toy Road south of Portersville
Adams House (Mercer County, Kentucky)
Adams House (Carson City, Nevada)
Adams Memorial (Washington, District of Columbia)
Adams National Historic Site (Norfolk County, Massachusetts)