Mazda North American Operations (MNAO) today announced U.S. sales of 21,493 units for the month of October, up 4.9 percent. Overall, Mazda's year-to-date sales total is 216,867, an increase of 3.7 percent over the 1999 year-to-date figure. Mazda North American Operations is responsible for the sales and marketing, customer parts and services support of Mazda vehicles in the United States. Headquartered in Irvine, Calif., MNAO has more than 750 dealerships nationwide and is owned by Mazda Motor Corporation, Hiroshima, Japan.