Nassau County's 2026 population is estimated at 1,405,210, reflecting a 0.46% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Nassau County is the 5th largest county in New York. The 2010 population was 1,341,642 and has grown 4.74% since 2010.
Data after 2023 is projected based on recent change
Overall: 42 years
Female: 43.2 years
Male: 40.6 years
There are 1,090,863 adults, (259,500 of whom are seniors) in Nassau County.
Female: 705,706 (50.8%)
Male: 683,885 (49.2%)
The racial composition of Nassau County includes 56.8% White, 12.23% Asian, 11.24% Black or African American, 9.23% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 789,352 | 56.8% |
| Asian | 169,900 | 12.23% |
| Black or African American | 156,203 | 11.24% |
| Two or more races | 142,379 | 10.25% |
| Other race | 128,325 | 9.23% |
| Native American | 3,134 | 0.23% |
| Native Hawaiian or Pacific Islander | 298 | 0.02% |
Nassau County 's average per capita income is $74,834. Household income levels show a median of $146,202. The poverty rate stands at 5.42%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $189,334 | $238,810 |
| Families | $169,137 | $216,488 |
| Households | $146,202 | $191,704 |
| Non Families | $68,026 | $95,304 |
Average Income
Median Household Income
Poverty Rate
