Hattiesburg
- County:
- Forrest County
- County Seat:
- Yes
- Area (mi²):
- 53.441
- State:
- Mississippi
Hattiesburg is a city located in Forrest County, Mississippi. Hattiesburg has a 2026 population of 48,522. It is also the county seat of Forrest County. Hattiesburg is currently declining at a rate of -0.16% annually and its population has decreased by -0.47% since the most recent census, which recorded a population of 48,752 in 2020.