Owned by local government

"S" Bridge (Washington County, Pennsylvania)
Stone arch bridge over a branch of Buffalo Creek on the old alignment of the National Road
12 Mile road-- Kalamazoo River Bridge (Calhoun County, Michigan)
Concrete arch bridge over Kalamazoo River on 12 Mile Road
12th Avenue South Bridge (King County, Washington)
Steel arch bridge over WA 90 (Dearborn Street) on 12th Avenue S in Seattle
14th Avenue South Bridge (King County, Washington)
Lost bascule bridge over Duwamish River on 14th Avenue South in Seattle
1724 Chester Courthouse (Delaware County, Pennsylvania)
1761 Milestone (Providence County, Rhode Island)
1841 Goshen Courthouse (Orange County, New York)
1879 Houston Waterworks (Harris County, Texas)
1884 Lumpkin County Jail (Lumpkin County, Georgia)
1890 Windermere School (Orange County, Florida)
1903 Clinton High School (East Feliciana Parish, Louisiana)
1911 Kinney County Courthouse (Kinney County, Texas)
1915 Taylor County Courthouse (Taylor County, Texas)
1938 Clinton High School (East Feliciana Parish, Louisiana)
1938 Lincoln County Courthouse (Lincoln County, Nevada)
19th Street Bridge (Denver County, Colorado)
Two-span wrought-iron through truss bridge over South Platte River on 19th Street in Denver
23 Mile Road--Kalamazoo River Bridge (Calhoun County, Michigan)
280th Street Bridge (Buchanan County, Iowa)
Relocated pony truss bridge on the SW 6th Street Liberty Trail in Independence
48th Police Precinct Station (Bronx County, New York)
9th Avenue Station (Dual System BRT) (Kings County, New York)
A. C. Steere Elementary School (Caddo Parish, Louisiana)
A. H. Brown Public Library (Walworth County, South Dakota)
A. H. Stewart House (Canyon County, Idaho)
A. Herr and E. E. Smith Public Library (Iroquois County, Illinois)
A. J. Hazeltine House (Warren County, Pennsylvania)
A. K. Smiley Public Library (San Bernardino County, California)
A. M. Rothschild & Company Store (Cook County, Illinois)
A. S. Bradford House (Orange County, California)
A. T. Stewart Company Store (New York County, New York)
A.L. Cole Memorial Building (Crow Wing County, Minnesota)
Aaron G. Cloud House (Hamilton County, Illinois)
Abandoned Route 66--Cuervo to NM 156 (Guadalupe County, New Mexico)
Abbeville County Courthouse (Abbeville County, South Carolina)
Abbeville Opera House (Abbeville County, South Carolina)
Historic government building & theater in Abbeville, SC
Abbey, The--Joaquin Miller House (Alameda County, California)
Abbot Hall (Essex County, Massachusetts)
Abbott Memorial Library (Penobscot County, Maine)
Abbott Street School (Worcester County, Massachusetts)
Abenaki Indian Shop and Camp (Carroll County, New Hampshire)
Aberdeen City Hall (Monroe County, Mississippi)
Abiaca Creek Bridge (Carroll County, Mississippi)
Through truss bridge over Abiaca Creek
Abigail Vare School (Philadelphia County, Pennsylvania)
Abijah C. Jay House (Grant County, Indiana)
Abilene City Park Historic District (Dickinson County, Kansas)
Abington Township High School (Montgomery County, Pennsylvania)
Abita Springs Pavilion (St. Tammany Parish, Louisiana)
Abraham Glen House (Schenectady County, New York)
Abraham Lincoln High School (Polk County, Iowa)
Abraham Lincoln Memorial Garden (Sangamon County, Illinois)
Abraham Lincoln Statue and Park (Fayette County, Iowa)
A unique statue of Abraham Lincoln is the centerpiece of a town park
Abram Huston House and Carriage House (Chester County, Pennsylvania)
Abram's Delight (Winchester, Virginia)
Academy Building (Cumberland County, Maine)
Academy Hall (Hartford County, Connecticut)
Academy of Richmond County--1926 Campus (Richmond County, Georgia)
Academy Street School (Salem, Virginia)
Ackerman--Dewsnap House (Bergen County, New Jersey)
Acworth Silsby Library (Sullivan County, New Hampshire)
Ada Covered Bridge (Kent County, Michigan)
Ada Public Library (Pontotoc County, Oklahoma)
Ada Village Hall (Norman County, Minnesota)
Adair County Courthouse (Adair County, Kentucky)
Adair County Courthouse (Adair County, Missouri)
Adair County Courthouse (Adair County, Iowa)
Adair County Courthouse (Adair County, Oklahoma)
Adair Viaduct (Adair County, Iowa)
Adairs Covered Bridge (Perry County, Pennsylvania)
Covered bridge over Shermans Creek on PA 3008
Adam Kurtz House (Winchester, Virginia)
Adam Ponthieu Store--Big Bend Post Office (Avoyelles Parish, Louisiana)
Adam Stephen House (Berkeley County, West Virginia)
Adams Academy (Norfolk County, Massachusetts)
Adams Commercial Historic District (Jefferson County, New York)
Adams County Courthouse (Adams County, Colorado)
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 Courthouse (Adams County, Idaho)
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 Memorial Building (Rockingham County, New Hampshire)
Adams Memorial Library (Du Page County, Illinois)
Adams Mill Covered Bridge (Carroll County, Indiana)
Covered bridge over Wildcat Creek on CR 50 East
Adams Odd Fellows Hall (Umatilla County, Oregon)
Adams School (Maricopa County, Arizona)
Adams, John Quincy, Birthplace (Norfolk County, Massachusetts)
Adams, John, Birthplace (Norfolk County, Massachusetts)
Addison Apartments (Mecklenburg County, North Carolina)
Addison Village Hall (Steuben County, New York)
Adel Bridge (Dallas County, Iowa)
1882 King Bridge Company, Two-span, through truss bridge over North Raccoon River in Adel
Administration Building, Atascadero Colony (San Luis Obispo County, California)
Adolph Lomb House (Monroe County, New York)
Adolphus Sterne House (Nacogdoches County, Texas)
Adon Smith House (Madison County, New York)
Adriance Memorial Library (Dutchess County, New York)
Aerial Lift Bridge (St. Louis County, Minnesota)
Vertical-lift through truss bridge over the Duluth Ship Canal on Lake Avenue in Duluth
Aetna Station No. 5 (Fond du Lac County, Wisconsin)
Repurposed fire station now serving as a private office
African Cemetery (Westchester County, New York)
African--American Cemetery, The (Orange County, New York)
Agnew Hunter Bahnson House (Forsyth County, North Carolina)
Agra Consolidated School (Phillips County, Kansas)
Agra Lake and Park (Phillips County, Kansas)
Agricultural Experiment Station Barn (Kodiak Island Borough, Alaska)
Ahimaaz King House (Warren County, Ohio)
Ainsley Hall House (Richland County, South Carolina)
Airtight Bridge (Coles County, Illinois)
Through truss bridge over Embarras River on TR 275, northeast of Charleston, 3 mi. northwest of Ashmore
Airway Radio Station (Gallatin County, Montana)
Aitkin Carnegie Library (Aitkin County, Minnesota)
Aitkin County Courthouse and Jail (Aitkin County, Minnesota)
Alabama and Vicksburg Railroad Depot (Newton County, Mississippi)
Alabama Girls' Industrial School (Shelby County, Alabama)
A women-only technical school that also offered high school-level courses.
Alabama Midland Railway Depot (Houston County, Alabama)
Alabama State Penitentiary (Elmore County, Alabama)
The first state prison established in Alabama.
Alamance County Courthouse, (Alamance County, North Carolina)
Alameda City Hall (Alameda County, California)
Alameda Free Library (Alameda County, California)
Alameda High School (Alameda County, California)
Alameda Veterans' Memorial Building (Alameda County, California)
Alamo Hotel (El Paso County, Colorado)
Alamo Placita Park (Denver County, Colorado)
Alamogordo Woman's Club (Otero County, New Mexico)
Alamosa County Courthouse (Alamosa County, Colorado)
Alango School (St. Louis County, Minnesota)
Alapaha Colored School (Berrien County, Georgia)
Alaska Totems (Ketchikan Gateway Borough, Alaska)
Albany Academy (Albany County, New York)
Albany Carnegie Public Library (Gentry County, Missouri)
Albany City Hall (Albany County, New York)
Albany Municipal Airport (Linn County, Oregon)
Albany Union Station (Albany County, New York)
Albers Brothers Mill (Pierce County, Washington)
Albert Lea City Hall (Freeborn County, Minnesota)
Albert Pike Memorial Temple (Pulaski County, Arkansas)
Albert S. Brandeis Elementary School (Jefferson County, Kentucky)
Albert W. Henn Mansion (Cuyahoga County, Ohio)
Alberta Teachers House (Stevens County, Minnesota)
Alberton School (Mineral County, Montana)
Albertville Depot (Marshall County, Alabama)
Albion Normal School Campus (Cassia County, Idaho)
Albright Bridge (Hamilton County, Iowa)
Albright Memorial Building (Lackawanna County, Pennsylvania)
Albuquerque Municipal Airport Building, Old (Bernalillo County, New Mexico)
Alden Bridge (Hardin County, Iowa)
Alden Public Library (Hardin County, Iowa)
Alderson Bridge (Unspecified county, West Virginia)
Alexander Clark House (Muscatine County, Iowa)
Alexander Classical School (Genesee County, New York)
Alexander Dallas Bache School (Philadelphia County, Pennsylvania)
Alexander Faribault House (Rice County, Minnesota)
Alexander Hamilton House (Franklin County, Pennsylvania)
Alexander K. McClure School (Philadelphia County, Pennsylvania)
Alexander Ramsey House (Ramsey County, Minnesota)
Alexander Theatre (Los Angeles County, California)
Alexander W. Livingston House (Franklin County, Ohio)
Alexander Willis House (Albany County, New York)
Alexander-Acacia Bridge (Marin County, California)
Alexander-Cannon-Hill House (Oconee County, South Carolina)
Alexanders (Ada County, Idaho)
Alexandria Cemeteries Historic District (De Kalb County, Tennessee)
Alexandria City Hall (Alexandria, Virginia)
Alexandria Public Library (Douglas County, Minnesota)
Alexandria Public Library, Old (Rapides Parish, Louisiana)
Alfalfa County Courthouse (Alfalfa County, Oklahoma)
Alford Park Warehouse (Kenosha County, Wisconsin)
Cream Brick warehouse, destroyed by fire in 2013
Alfred Dolge Hose Co. No. 1 Building (Herkimer County, New York)
Alfred E. Dickey Free Library (Stutsman County, North Dakota)
Algeria Shrine Temple (Lewis and Clark County, Montana)
Aliceville Elementary and High School (Pickens County, Alabama)
Aline Barnsdall Complex (Los Angeles County, California)
Aline Covered Bridge (Snyder County, Pennsylvania)
Covered bridge over North Branch Mahantango Creek in Meiserville
Allamakee County Court House (Allamakee County, Iowa)
Depression-era PWA Moderne building of pressed brick and Bedford limestone.
Allamakee County Courthouse (Allamakee County, Iowa)
Alleghany County Courthouse (Alleghany County, North Carolina)
Allegheny County Courthouse and Jail (Allegheny County, Pennsylvania)
Allegheny High School (Allegheny County, Pennsylvania)
Allen County Courthouse (Allen County, Ohio)
Allen County Courthouse (Allen County, Indiana)
Allen County Jail (Allen County, Kansas)
Allen Hazen Water Tower (Polk County, Iowa)
Allen Parish Courthouse (Allen Parish, Louisiana)
Allen School (Bureau County, Illinois)
Allendale County Courthouse (Allendale County, South Carolina)
County Courthouse in Allendale, SC
Allenstown Meeting House (Merrimack County, New Hampshire)
Allgates (Delaware County, Pennsylvania)
Alliance Bank Building (Stark County, Ohio)
Almshouse (Middlesex County, Massachusetts)
Almshouse, The (Richmond, Virginia)