- American Commissioners7
- American Daily Advertiser1
- American Dry Goods Company1
- American Electric Co.1
- American Iron Works Jones & Laughlins2
- American Jewish Joint Distribution Committee23
- American Labor Party3
- American Mutual Liability Insurance Company1
- American Needle Co.1
- American Net & Twine Company1
- American Pad & Textile Co.2
- American Standard Jewelry Co.1
- American Surety Company2
- Americans for Democratic Action104
- Ames, Fisher, 1758-18083
- Ames, Jessie Daniel, 1883-19722
- Amherst College. Library3
- Amherst of Arracan, William Pitt Amherst, Earl, 1773-185739
- Amherst, Elizabeth, 1739 or 1740-183018
- Amherst, Jeffery Amherst, Baron, 1717-17971
- Anderson & Price1
- Anderson Carriage Co.1
- Anderson Water, Light & Power Company1
- Anderson, Clinton P.34
- Anderson, Florence, 1910-142
- Anderson, James W.5
- Andrews, Joseph M.1
- Andros, Edmund, Sir, 1637-17146
- Anger-Brohel Co., Inc.1
- Angerstein, Mr.1
- Anglois, Chevalier1
- Anne, Queen of Great Britain, 1665-17143
- Anonymous1
- Ansley, John1
- Anstey, John2
- Anthon, George1
- Anthony, Theophilus1
- Antill, Edward, 1742-17893
- Antozone Chemical Co.1
- Aparacio, Domingo2
- Appleget, Thomas B. (Thomas Baird)1
- Aranha, Oswaldo, 1894-19604
- Arbuckle Bros.2
- Arbuckle-Ryan Co.2
- Arbuthnot, Admiral1
- Arbuthnot, Marriott, 1711?-17941
- Archer, Henry W.1
- Archer, Henry Waldegrave1
- Armand, Colonel1
- Armstrong, Sir Harry and Lady Margaret6
- Arnold, Benedict, 1741-18013
- Arnold, Samuel1
- Arnoux, Abbe de1
- Asalto, del, Captain General2
- Asch, Berta2
- Asch, Sholem, 1880-19574
- Ashepoo Phosphate Co.1
- Ashfield, V. P.1
- Ashford, Gerald, 1907-1
- Associate Justices1