Erin
- County:
- Houston County
- County Seat:
- Yes
- Area (mi²):
- 3.896
- State:
- Tennessee
Erin is a city located in Houston County, Tennessee. Erin has a 2026 population of 1,220. It is also the county seat of Houston County. Erin is currently growing at a rate of 2.01% annually but its population has decreased by -0.81% since the most recent census, which recorded a population of 1,230 in 2020.