Long Beach
- County:
- Harrison County
- County Seat:
- No
- Area (mi²):
- 10.243
- State:
- Mississippi
Long Beach is a city located in Harrison County, Mississippi. Long Beach has a 2026 population of 17,217. Long Beach is currently growing at a rate of 0.94% annually and its population has increased by 2.42% since the most recent census, which recorded a population of 16,810 in 2020.