La Harpe
- County:
- Hancock County
- County Seat:
- No
- Area (mi²):
- 1.364
- State:
- Illinois
La Harpe is a city located in Hancock County, Illinois. La Harpe has a 2026 population of 1,137. La Harpe is currently declining at a rate of -1.13% annually and its population has decreased by -3.07% since the most recent census, which recorded a population of 1,173 in 2020.