Lengby
- County:
- Mahnomen County
- County Seat:
- No
- Area (mi²):
- 0.246
- State:
- Minnesota
Lengby is a city located in Mahnomen County, Minnesota. Lengby has a 2026 population of 89. Lengby is currently declining at a rate of -1.11% annually and its population has decreased by -2.2% since the most recent census, which recorded a population of 91 in 2020.
The median household income in Lengby is $50,833 with a poverty rate of 44.19%. The median age in Lengby is 44.8 years: 45.5 years for males, and 44.8 years for females. For every 100 females there are 126.3 males.