Sulphur
- County:
- Calcasieu Parish
- County Seat:
- No
- Area (mi²):
- 11.235
- State:
- Louisiana
Sulphur is a city located in Calcasieu Parish, Louisiana. Sulphur has a 2026 population of 20,572. Sulphur is currently growing at a rate of 0.47% annually but its population has decreased by -5.72% since the most recent census, which recorded a population of 21,819 in 2020.