- Allen Bros. 17 Cornhill, Boston1
- Allport, Frank 1856-19351
- Allsbrook, Nina M.1
- Alnwick, Davison1
- Amberg, Jeff2
- American Cancer Society1
- American Cystoscope Makers, Inc., New York, New York1
- American Optical Company, Southbridge, Massachusetts2
- American Optical, Inc.1
- Andrew A. Kroeg Pharmacist, Charleston, South Carolina1
- Ape1
- Armstrong & Co.2
- Atkinson, A.1
- Austin, W. B.1
- Austin, W.B.8
- Avery Lactate Company2
- Bahr, D. H.1
- Baker, Perry2
- Baldwin, Lina-Hamilton1
- Ballou, Maturin M. (Maturin Murray), 1820-18951