
Old Westbury
- County:
- Nassau County
- County Seat:
- No
- Area (mi²):
- 8.572
- State:
- New York
Old Westbury is a village located in Nassau County, New York. Old Westbury has a 2025 population of 5,192. Old Westbury is currently growing at a rate of 3.59% annually and its population has increased by 20.91% since the most recent census, which recorded a population of 4,294 in 2020.
The average household income in Old Westbury is $441,391 with a poverty rate of 5%. The median age in Old Westbury is 28.7 years: 37.3 years for males, and 27.2 years for females.