High Quality Content by WIKIPEDIA articles! The 1966 United States Grand Prix was a Formula One race held on October 2, 1966 at the Watkins Glen Grand Prix Race Course in Watkins Glen, New York. It was the eighth and penultimate round of the 1966 World Championship. The race was the ninth United States Grand Prix (16th including the American Grand Prize races of 1908–16). It was the sixth to be held at Watkins Glen. The race was held over 108 laps of the 3.78-kilometre circuit for a total race distance of 408 kilometres.