National Car Rental, online at nationalcar.com, save money on hot items when shopping on National Car Rental when applying our coupons, promo codes during checkout. Trust us, these coupons are good. Make the best of our National Car Rental promo codes to get $20 OFF. All discounts are totally free to use. National Car Rental is a rental car company based in Clayton, Missouri. National was founded by 24 independent rental car agents on August 27, 1947. It has grown from 60 locations in the United States in 1947 to over 2000 locations worldwide as of 2005.In 1996, National acquired the Canadian fleet and operations of Tilden Rent-a-Car.National is owned by Enterprise Holdings, which also owns Alamo Rent a Car and Enterprise Rent-A-Car.On August 1, 2007 Enterprise Rent-A-Car assumed control of Vanguard Automotive Group. It was purchased from Cerberus Capital Management, L.P.