La Harpe
- County:
- Allen County
- County Seat:
- No
- Area (mi²):
- 0.797
- State:
- Kansas
La Harpe is a city located in Allen County, Kansas. La Harpe has a 2026 population of 488. La Harpe is currently declining at a rate of 0% annually and its population has increased by 0.62% since the most recent census, which recorded a population of 485 in 2020.