
Johnstown
- County:
- Weld County
- County Seat:
- No
- Area (mi²):
- 15.437
- State:
- Colorado
Johnstown is a town located in Weld County, Colorado. Johnstown has a 2025 population of 20,939. Johnstown is currently growing at a rate of 3.53% annually and its population has increased by 20.55% since the most recent census, which recorded a population of 17,369 in 2020.
The average household income in Johnstown is $134,531 with a poverty rate of 2.21%. The median age in Johnstown is 34 years: 33.9 years for males, and 34 years for females.