WELCOME to Diamond Mazda in Baton Rouge, Louisiana! Diamond Mazda is located at 10968 Airline Highway (Hwy 61, South), Baton Rouge, Louisiana 70816. For directions click here for a map. Our telephone contact # is 225-295-3900. If you are looking for a new Mazda vehicle in Louisiana or Southwest Mississippi then Diamond Mazda is here to serve you. We want you to have a pleasant car buying experience. Diamond Mazda will treat you professionally with respect and honesty while giving you the best possible price on a New Mazda or used vehicle. That is our pledge to you.