Longmont is a home rule municipality located in Boulder and Weld counties, Colorado, United States. Its population was 98,885 as of th…Longmont is a home rule municipality located in Boulder and Weld counties, Colorado, United States. Its population was 98,885 as of the 2020 U.S. Census. Longmont is located northeast of the county seat of Boulder. It is named after Longs Peak, a prominent mountain that is clearly visible from the city.
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