Harrisburg
- County:
- Poinsett County
- County Seat:
- Yes
- Area (mi²):
- 2.426
- State:
- Arkansas
Harrisburg is a city located in Poinsett County, Arkansas. Harrisburg has a 2026 population of 2,200. It is also the county seat of Poinsett County. Harrisburg is currently declining at a rate of -0.09% annually and its population has decreased by -0.95% since the most recent census, which recorded a population of 2,221 in 2020.