Westby
- County:
- Sheridan County
- County Seat:
- No
- Area (mi²):
- 0.562
- State:
- Montana
Westby is a town located in Sheridan County, Montana. Westby has a 2026 population of 162. Westby is currently declining at a rate of -1.22% annually and its population has decreased by -2.99% since the most recent census, which recorded a population of 167 in 2020.
The median household income in Westby is $32,500 with a poverty rate of 8.28%. The median age in Westby is 53.3 years: 59.4 years for males, and 49.7 years for females. For every 100 females there are 119.7 males.