Car manufacturer A
| Name | Number of models |
|---|---|
| Abc | 5 |
| Abi | 1 |
| Accord | 1 |
| Accubuilt | 2 |
| Acro | 1 |
| Action Auto Body | 1 |
| Acura | 27 |
| Adventure | 7 |
| Aero | 9 |
| Aero Cub | 1 |
| Aerolite | 5 |
| Airstream | 45 |
| A&j Vans | 1 |
| Alfa | 14 |
| Alfa Leisure | 6 |
| Alfa Romeo | 22 |
| Aliner | 5 |
| Allegro | 4 |
| Allure | 6 |
| Aluminum | 2 |
| Ameri-camp | 10 |
| American Ironhorse | 13 |
| American Lafrance | 6 |
| American Motors | 22 |
| American Tradition Brand | 1 |
| American Van | 3 |
| Am General | 37 |
| Am-tran | 3 |
| Amtran | 24 |
| Am Tran Corp | 1 |
| Apache | 1 |
| Aprilia | 31 |
| Aprilla | 2 |
| Arctic Fox | 3 |
| Argosy | 4 |
| Arising | 2 |
| Aristocrat | 1 |
| Arrow Trailers | 1 |
| Asplundh | 1 |
| Aston Martin | 10 |
| Athey | 9 |
| Audi | 60 |
| Autocar | 59 |
| Automotive | 1 |
| Avanti | 2 |
| Az-tex | 1 |