Owned by state government

"S" Bridge II (Muskingum County, Ohio)
145th Street Subway Station (IRT) (New York County, New York)
168th Street Subway Station (IRT) (New York County, New York)
181st Street Subway Station (IND) (New York County, New York)
181st Street Subway Station (IRT) (New York County, New York)
18th Separate Company Armory (Warren County, New York)
190th Street Subway Station (IND) (New York County, New York)
1931 Tempe Bridge (Maricopa County, Arizona)
28th Street Subway Station (IRT) (New York County, New York)
32nd St. and Lancaster Ave. Philadelphia Armory (Philadelphia County, Pennsylvania)
33rd Street Subway Station (IRT) (New York County, New York)
369th Regiment Armory (New York County, New York)
4th Avenue Station (IND) (Kings County, New York)
69th Regiment Armory (New York County, New York)
72nd Street Subway Station (IRT) (New York County, New York)
79th Street Subway Station (IRT) (New York County, New York)
7th District Police Station (Cook County, Illinois)
A. H. Stephens Memorial State Park (Taliaferro County, Georgia)
Abbott's Mill (Sussex County, Delaware)
Abo (Torrance County, New Mexico)
Abraham Lincoln Elementary School (Los Angeles County, California)
Absecon Lighthouse (Atlantic County, New Jersey)
Academy Hall (Erie County, Pennsylvania)
Acadian House (St. Martin Parish, Louisiana)
Ackerman-Zabriskie-Steuben House (Bergen County, New Jersey)
Adams Avenue Bridge in Philadelphia (Philadelphia County, Pennsylvania)
Adamson Bridge (Cherry County, Nebraska)
Adamson House (Los Angeles County, California)
Adas Israel Synagogue (Washington, District of Columbia)
Adele Ilfeld Auditorium (San Miguel County, New Mexico)
Adirondack Forest Preserve (Unspecified county, New York)
Adjutant General's Residence (Pierce County, Washington)
Administration Building (Union County, Oregon)
Administration Building (Roosevelt County, New Mexico)
Administration Building (Otero County, New Mexico)
Administration/Science Building (Maricopa County, Arizona)
Ag Hill Complex (Centre County, Pennsylvania)
Agate Pass Bridge (Kitsap County, Washington)
Cantilevered through truss bridge over Agate Passage on WA 305 in Suquamish
Agnews Insane Asylum (Santa Clara County, California)
Agricultural Chemistry Building (Dane County, Wisconsin)
Agricultural Dean's House (Dane County, Wisconsin)
Agricultural Engineering Building (Dane County, Wisconsin)
Agricultural Heating station (Dane County, Wisconsin)
Agriculture Building (Wake County, North Carolina)
Agriculture Hall (Dane County, Wisconsin)
Agriculture Hall (Story County, Iowa)
Ailsa Farms (Passaic County, New Jersey)
Air Science (Dona Ana County, New Mexico)
AJX Bridge over South Fork and Powder River (Johnson County, Wyoming)
Deck truss bridge over South Fork Powder River on I-25 West Service Road (Old US 87) at Milepost 246.30
Alabama Insane Hospital (Tuscaloosa County, Alabama)
Alabama's oldest and largest inpatient psychiatric facility.
Alabama State Capitol (Montgomery County, Alabama)
Alabama State University Historic District (Montgomery County, Alabama)
Aladdin Theater (Brevard County, Florida)
Alamance Battleground State Historic Site (Alamance County, North Carolina)
Alamo, The (Bexar County, Texas)
Alaska Governor's Mansion (Juneau Borough, Alaska)
Albert W. Thompson Hall (Whitman County, Washington)
Albertus L. Meyers Bridge (Lehigh County, Pennsylvania)
Open-spandrel arch bridge over Little Lehigh Creek on PA 2055 (8th Street) in Allentown
Alchesay Canyon Bridge (Maricopa County, Arizona)
Concrete arch bridge over Alchesay Canyon on AZ 88
Alcorn State University Historic District (Claiborne County, Mississippi)
Alewife Brook Parkway (Middlesex County, Massachusetts)
Alexander Crummell School (Washington, District of Columbia)
Alfred H. Renshaw House (Albany County, New York)
Aliiolani Hale (Honolulu County, Hawaii)
Allaire Village (Monmouth County, New Jersey)
Allegheny Aqueduct (Berks County, Pennsylvania)
Allen House (Alamance County, North Carolina)
Allen House (Middlesex County, Massachusetts)
Allenwood River Bridge (Unspecified county, Pennsylvania)
Alliance Furnace (Fayette County, Pennsylvania)
Allis State Park (Orange County, Vermont)
Aloha Tower (Honolulu County, Hawaii)
Alston House (Moore County, North Carolina)
Altaville Grammar School (Calaveras County, California)
Altgeld Hall, University of Illinois (Champaign County, Illinois)
Alton Club (Shannon County, Missouri)
Altoona Armory (Blair County, Pennsylvania)
American Flag Raising Site (Sitka Borough, Alaska)
American Legion Forest CCC Shelter (Litchfield County, Connecticut)
Ammons Hall (Larimer County, Colorado)
Ampere Station (Essex County, New Jersey)
Amsterdam (46th Separate Company) Armory (Montgomery County, New York)
AN/FPS-35 Radar Tower and Antenna (Suffolk County, New York)
Anaconda Copper Mining Company Smoke Stack (Deer Lodge County, Montana)
Anadarko Armory (Caddo County, Oklahoma)
Anclote Key Lighthouse (Pinellas County, Florida)
Anderson Hall (Riley County, Kansas)
Anderson House and Lexington Battlefield (Lafayette County, Missouri)
Anderson-Smith House (McCracken County, Kentucky)
Andrews-Duncan House (Wake County, North Carolina)
Angel Island, U.S. Immigration Station (Marin County, California)
Angel Mounds (Vanderburgh County, Indiana)
Angelina River Bridge (Angelina County, Texas)
Angustias Shipwreck Site (Monroe County, Florida)
Animal Science Building (Yolo County, California)
Anna Head School for Girls (Alameda County, California)
Anna Russell Cole Auditorium (Davidson County, Tennessee)
Annie Laurie Evans Hall (Waller County, Texas)
Anoka-Champlin Mississippi River Bridge (Unspecified county, Minnesota)
Reinforced concrete ribbed open-spandrel arch bridge over Mississippi River on US 169 in Anoka
Antelope Valley Indian Museum (Los Angeles County, California)
Appellate Court, 5th District (Jefferson County, Illinois)
Appomattox (Shipwreck) (Milwaukee County, Wisconsin)
Largest wooden steam freighter on the Great Lakes that ran aground in 1905
Appomattox River Bridge (Appomattox County, Virginia)
AR 289 Bridge Over English Creek (Fulton County, Arkansas)
Arab Mountain Fire Observation Station (St. Lawrence County, New York)
Arbor Lodge (Otoe County, Nebraska)
Arizona Pioneers' Home (Yavapai County, Arizona)
Arizona State Capitol Building (Maricopa County, Arizona)
Arkansas 7/51 Bridge (Clark County, Arkansas)
Through truss bridge over Ouachita River at Arkadelphia carrying AR 7, AR 8, and AR 51
Arkansas Highway 57 Bridge (Ouachita County, Arkansas)
Pony truss bridge over the railroad tracks on AR 57 in Stephens
Arkansas State Capitol (Pulaski County, Arkansas)
Armory of the Kentish Guards (Kent County, Rhode Island)
Armory, The (Monroe County, Florida)
Armour's Warehouse (LaSalle County, Illinois)
Armstrong Manual Training School (Washington, District of Columbia)
Army Theatre (Dawes County, Nebraska)
Arrawanna Bridge (Middlesex County, Connecticut)
Arrow Rock State Historic Site Bridge (Saline County, Missouri)
Arrow Rock Tavern (Saline County, Missouri)
Art Annex (Bernalillo County, New Mexico)
Artisan's House (Anne Arundel County, Maryland)
Ash Fork Maintenance Camp #1 (Yavapai County, Arizona)
Ash Street--Sycamore Creek Bridge (Ingham County, Michigan)
Ashbel Smith Building (Galveston County, Texas)
Ashbel Woodward House (New London County, Connecticut)
Ashland Armory (Boyd County, Kentucky)
Ashland Bridge (New Castle County, Delaware)
Town lattice covered bridge over Red Clay Creek
Ashland Middle School (Ashland County, Wisconsin)
Ashland Oregon National Guard Armory (Jackson County, Oregon)
Ashland Tuberculosis Hospital (Boyd County, Kentucky)
Ashley River Road (Unspecified county, South Carolina)
Asilomar Conference Grounds (Monterey County, California)
Assay Office (Ada County, Idaho)
Astor Fur Warehouse (Crawford County, Wisconsin)
Astor Place Subway Station (IRT) (New York County, New York)
Athens State Hospital (Athens County, Ohio)
Athens State Hospital Cow Barn (Athens County, Ohio)
Atkinson Hall, Georgia College (Baldwin County, Georgia)
Atsion Village (Burlington County, New Jersey)
Auburn Brick Road (Sangamon County, Illinois)
Auburn House (Baltimore County, Maryland)
Auditorium (Los Angeles County, California)
Auditorium and Recreation Building (Otero County, New Mexico)
August 13 Clark's Lookout 1805 (Beaverhead County, Montana)
Aurora Avenue Bridge (King County, Washington)
AuSable Chasm Bridge (Clinton County, New York)
Steel arch bridge over AuSable River on US 9
Avenue U Station (Dual System BRT) (Kings County, New York)
Avery House (New London County, Connecticut)
Avery Point Lighthouse (New London County, Connecticut)
Ayer Hall (Hinds County, Mississippi)
Aztec Bowl (San Diego County, California)
Azure Mountain Fire Observation Station (Franklin County, New York)
B. B. Moeur Activity Building (Maricopa County, Arizona)
Babcock Building, South Carolina State Hospital (Richland County, South Carolina)
Baca House and Outbuilding (Las Animas County, Colorado)
Badger Hole (Custer County, South Dakota)
Bailey Hall (Douglas County, Kansas)
Bailey Hall houses several of the Liberal Arts College programs.
Bailey Hall (Tompkins County, New York)
Bainbridge Ferry Road (Cape Girardeau County, Missouri)
Bangor Mental Health Institute (Penobscot County, Maine)
Bannerman's Island Arsenal (Dutchess County, New York)
Barclay House (Bedford County, Pennsylvania)
Barnard Observatory (Lafayette County, Mississippi)
Barnegat Lighthouse (Ocean County, New Jersey)
Barnwell-Gough House (Beaufort County, South Carolina)
Barrackville Covered Bridge (Marion County, West Virginia)
Burr arch-truss bridge over Finch's Run on CH 21
Barto Bridge (Berks County, Pennsylvania)
Bastrop State Park (Bastrop County, Texas)
Batsto Village (Burlington County, New Jersey)
Battery 223 (Cape May County, New Jersey)