
Thiells
- County:
- Rockland County
- County Seat:
- No
- Area (mi²):
- 1.816
- State:
- New York
Thiells is a CDP located in Rockland County, New York. Thiells has a 2025 population of 4,356. Thiells is currently declining at a rate of -1.02% annually but its population has increased by 2.57% since the most recent census, which recorded a population of 4,247 in 2020.
The average household income in Thiells is $161,548 with a poverty rate of 3.25%. The median age in Thiells is 41.4 years: 42.7 years for males, and 40.4 years for females.