All - Constructed - 1900–1909
| 10th and Pierce Car Barn |
| 14th Street-Union Square Subway Station (IRT; Dual System BMT) |
| 1907 Dorris Motor Car Company Building |
| 242nd Street-Van Cortlandt Park Station (IRT) |
| 42nd Precinct Police Station |
| 52nd Police Precinct Station House and Stable |
| Abbeville County Courthouse |
| Abbeville Opera House |
| Abbott Memorial Library |
| Abbs, Walter, House |
| Abraham Lincoln Statue and Park |
| Abrams, H. D., House |
| Academia Pomeroy Covered Bridge |
| Academy of Music |
| Academy Street School |
| Acevedo, Rafael, House |
| Acord, John, House |
| Acting Superintendent's Headquarters |
| Adam, L.C., Mercantile Building |
| Adams and Sickles Building |
| Adams Avenue Bridge in Philadelphia |
| Adams Building |
| Adams, Charles F., House |
| Adams County Courthouse |
| Adams, D. V., Co.-Bussell and Weston |
| Adams, Joe Chase, House |
| Adams-Matheson House |
| Ada Odd Fellows Temple |
| Addison Village Hall |
| Adena Court Apartments |
| Adin Supply Company |
| Administration Building, University of Idaho |
| Adrian Public Library |
| Aftermath Clubhouse |
| Agee House |
| Agricultural Engineering Building |
| Agriculture Hall |
| Aho, Elias and Lisi, Historic Farmstead |
| Ainsworth, Maud and Belle, House |
| Ajax Metal Company Plant |
| Akron Public Library |
| Alabama and Vicksburg Railroad Depot |
| Alameda County Building and Loan Association Building |
| Alameda Free Library |
| Alarid, Ricardo, House |
| Alaska Central Railroad: Tunnel No. 1 |
| Alaska Trade Building |
| Albers Brothers Milling Company |
| Alberts Chapel |
| Albion Carnegie Library |
| Alden, Arthur, House |
| Aldrich Public Library |
| Alesia |
| Alexander and Busey Houses |
| Alexander House |
| Alexander, John, House |
| Alexandra |
| Alexandria Union Station |
| Allamuchy Freight House |
| Allardt Presbyterian Church |
| Allegheny Observatory |
| Allen Mercantile Company |
| Allentown National Bank |
| Allen, William R., School |
| Allis, Charles, House |
| All Saints Catholic Church |
| All Saint's Church |
| All Saints' Church |
| All Souls Church |
| Allsup, Marion, House |
| Allton Building |
| Alpha Phi Fraternity House-Beta Alpha Chapter |
| Alston-Bedwell House |
| Altamaha Apartments |
| Altenheim |
| Alumni Hall |
| Alvarado Park |
| Amalgamated Center |
| American Bank Note Company Building |
| American Baptist Home Mission House |
| American Boathouse |
| American Cigar Factory |
| American Fork City Hall |
| American Fork Second Ward Meetinghouse |
| American Fork Third Ward Meetinghouse |
| American Mills Web Shop |
| American National Bank Building |
| American National Bank Building |
| American Security and Trust Company |
| American Spinning Company Mill No. 2 |
| American Telephone & Telegraph Co. Bldg. |
| American Women's League Chapter House |
| Ames Cottage |
| Amman |
| Ampere Station |
| Anderson County Courthouse |
| Anderson, D. B., and Company Building |
| Anderson-Frank House |
| Anderson Park |
| Angel, Arturo, House |
Data from United States Park Service and Wikidata
