Allen
- County:
- Lyon County
- County Seat:
- No
- Area (mi²):
- 0.276
- State:
- Kansas
Allen is a city located in Lyon County, Kansas. Allen has a 2026 population of 165. Allen is currently growing at a rate of 1.85% annually and its population has increased by 2.48% since the most recent census, which recorded a population of 161 in 2020.
The median household income in Allen is $59,016 with a poverty rate of 8.01%. The median age in Allen is 40.5 years: 37.8 years for males, and 42 years for females. For every 100 females there are 77.2 males.