Four County Auto Service is conveniently located in Mt. Airy, MD. We are called Four County Auto Service for a reason! We offer auto repairs to customers in Frederic, Carroll, Howard & Montgomery County Maryland. With over 50 years’ experience, we providing quality preventive auto maintenance and auto repair services on all makes and models of vehicles. Our ASE & factory trained technicians are fully committed to the satisfaction of each and every customer. At Four County Auto Service, we stand behind our reputation for reliable, trusted auto repairs in Mt Airy at fair prices.