How many people live in Nassau County, NY?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 1.39 million people living in Nassau County, NY. That makes Nassau County the 29th-most populous county in the US. It is also the fifth-largest in New York, accounting for 7% of the state’s population.
1.39M
population of Nassau County, NY (2024)
7%
County share of the New York population (2024)
About 1.39 million people lived in Nassau County, NY in 2024.
Population estimates, 2000–2024
What are Nassau County, NY’s age demographics?
About 273,100 Nassau County, NY residents are aged 65 and older in 2024. That represents 19.6% of its population. For comparison, the age group represents 18.9% of New York’s population and 18% in the US overall.
Another 295,400 Nassau County residents, or 21.2% of the population, were children under 18. For comparison, the age group represents 20.1% of New York’s population and 21.6% in the US overall.
A lower share of Nassau County, NY's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Nassau County, NY’s racial and ethnic demographics?
Non-Hispanic Asian residents make up 13.9% of the Nassau County, NY population, higher than the national share of 6.5%.
In contrast, Nassau County’s non-Hispanic white population accounts for 53.5%, below the 57.5% nationwide, and the non-Hispanic Black or African American population makes up 11.7% of the county, compared with 12.6% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Nassau County, NY has a higher share of a non-Hispanic Asian population than New York as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Nassau County, NY is Hempstead with about 59,600 residents in 2024.
Cities and towns in Nassau County, NY ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Hempstead | 59,569 |
| 2. | Freeport | 44,028 |
| 3. | Valley Stream | 40,232 |
| 4. | Long Beach | 34,777 |
| 5. | Glen Cove | 28,088 |
| 6. | Rockville Centre | 25,718 |
| 7. | Garden City (pt.) | 22,989 |
| 8. | Mineola | 21,305 |
| 9. | Lynbrook | 20,684 |
| 10. | Massapequa Park | 16,922 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
