
Llewellyn Park
- County:
- Essex County
- County Seat:
- No
- Area (mi²):
- 0.714
- State:
- New Jersey
Llewellyn Park is a CDP located in Essex County, New Jersey. Llewellyn Park has a 2025 population of 851. Llewellyn Park is currently growing at a rate of 7.18% annually and its population has increased by 123.36% since the most recent census, which recorded a population of 381 in 2020.
The average household income in Llewellyn Park is $298,517 with a poverty rate of 2.43%. The median age in Llewellyn Park is 43.5 years: 43.2 years for males, and 54.4 years for females.