Longmont is a Home Rule Municipality in Boulder and Weld counties in the U.S. state of Colorado. Longmont is the 13th most populous city in the State of Colorado.朗蒙特市是地方自治在博尔德县和焊缝在美国科罗拉多州。朗蒙特是美国科罗拉多州第13大人口多的城市.