Rental car companies Avis and ALAMO are two of the most popular car rental companies in the world. Avis, founded in 1946, is a global car rental company with over 5, 000 locations in 165 countries. ALAMO, founded in 1974, is a car rental company based in the United States with over 1, 000 locations in the US, Canada, Mexico, and the Caribbean. Both companies offer a wide range of vehicles, from economy to luxury, and provide customers with competitive rates and excellent customer service.