Old Westbury City is located in Nassau County. The population of the city is estimated to reach 4,213 in 2020. The city is experiencing a steady decline with a population that has decreased by -0.89% yearly. Since the 2010 census, the city's population has decreased by -1.77%. The median income in Old Westbury is $0 per month. The median house value is $1.88M. The median age of the population is 26.3 years old and 35.9 years old, which is lower than average.
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