
Longmont
- County:
- Boulder County
- County Seat:
- No
- Area (mi²):
- 29.038
- State:
- Colorado
Longmont is a city located in Boulder County, Colorado. Longmont has a 2025 population of 98,258. Longmont is currently declining at a rate of -0.19% annually and its population has decreased by -0.94% since the most recent census, which recorded a population of 99,188 in 2020.
The average household income in Longmont is $112,684 with a poverty rate of 8.56%. The median age in Longmont is 40.1 years: 38.9 years for males, and 41.8 years for females.