* Ford: Dominated the market with the Model A and later introduced updated models.
* General Motors (GM): This conglomerate included brands like Chevrolet, Buick, Oldsmobile, Pontiac, and Cadillac, offering a wide range of vehicles at different price points.
* Chrysler: Competed with Ford and GM, with brands like Plymouth, DeSoto, Chrysler, and later Dodge.
* Hudson: Known for its innovative engineering and styling.
* Nash: Another significant player, later merging with Hudson.
* Packard: Produced luxury cars.
* Pierce-Arrow: Also a luxury car manufacturer.
* Studebaker: Known for its sturdy and reliable vehicles.
* Willys-Overland: Produced a range of cars, including the iconic Jeep's predecessor.
This is not an exhaustive list, and many smaller manufacturers and regional brands also existed during the 1930s. Many European and other international manufacturers were also active, though their presence in the US market might have been smaller.