Allen (Karosseriebauunternehmen)

Allegheny / Allegheny Foundry Company

Alena / Alena Steam Products Company

Aldo / Albaugh-Dover Company

Alden Sampson / Alden Sampson Manufacturing Company

Alco (Automarke)

Albany / Albany Automobile Company

Aland / Aland Motor Car Company

Akron Two-Cycle Automobile Company

Ajax / The Ajax Motor Vehicle Company