CarMax Automotive Dealerships CarMax Visit Website 16500 West Colfax Ave Golden, Colorado 80401 (844) 344-1118 Facebook Hours: Grand Opening February 2018! About Map About CarMax is the nation's largest retailer of used cars and for more than 20 years, has made car buying more honest, transparent and stress-free by offering a no-haggle, no-hassle experience and an incredible selection of vehicles. What's Nearby? Distance: 5 10 15 20 25 50 mi.