Rio
- County:
- St. Tammany Parish
- County Seat:
- No
- Area (mi²):
- 1.133
- State:
- Louisiana
Rio is a CDP located in St. Tammany Parish, Louisiana. Rio has a 2025 population of 334. Rio is currently growing at a rate of 7.05% annually and its population has increased by 8.44% since the most recent census, which recorded a population of 308 in 2020.
The median age in Rio is 13.2 years: 4.7 years for males, and 13.4 years for females.