- Abert, John James, 1788-18631
- Académie des sciences (France)1
- Achin1
- Ackermann and Co.1
- Adams, Henry, Captain1
- Adams, J. E. (James Edward), 1898-1
- Adept Map Co.1
- Advocate-Republican1
- Agas, Ralph, 1545-16211
- Agnus aîné, publisher1
- Ahlgrim, M. J., cartographer.1
- Akademii︠a︡ nauk SSSR1
- Akerson, E. A1
- Akrel, Fredrik,1748-18041
- Albergaria, Lopo Soares de, approximately 1453-approximately 15321
- Alden, William C. (William Clinton), 1871-19591
- Allen Rate Map Company.1
- Allen, C. R.1
- Allen, Charles Julius,1840-19151
- Allen, George (Engraver)1