Nassau County, New York
Located in New York, Nassau County has a population of 1,389,591 residents and a median age of 42.0 years, making it the #30 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 5.4%. The median home value is $684,700, and the median household income is $146,202, which is 95% above the national median.
Demographics
Nassau County has a population of 1,389,591, making it the #30 most populous county in the US. The median age is 42.0 years, which is 8.0% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Nassau County is $146,202, ranking #9 out of 3,222 counties — 94.5% above the national median. The poverty rate is 5.4% and unemployment stands at 4.8%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Nassau County is $684,700 (+142.9% vs national). Renters pay a median of $2,252/mo and the homeownership rate is 81.9%.
Median Home Value Trend
Rankings →Household Type
Education
In Nassau County, 49.7% of adults age 25+ hold a bachelor's degree or higher, which is 47.4% above the national average, ranking #102 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Nassau County is 81.3 years. 11.7% of adults report poor or fair health and 4.4% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
9.4% of adults in Nassau County smoke , 26.9% are obese , and 21.1% report excessive drinking. The drug overdose death rate is 19.2 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in Nassau County is 1.6 per 100,000 and the suicide rate is 5.7 per 100,000. Motor vehicle deaths occur at a rate of 6.1 per 100,000.
Homicide Rate Trend
Families & Children
6.3% of children in Nassau County live in poverty and the infant mortality rate is 3.0 per 1,000 live births. The teen birth rate is 5.3 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in Nassau County is 76.0%. The mean commute time is 39.7 min, which is 43.7% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Nassau County voted Republican with a margin of 4.2%. The vote was 47.9% Dem / 52.1% Rep. Compared to 2020, the margin shifted 13.7 toward Republicans .
Vote Share Over Time
About Nassau County, New York
Nassau County, New York has a total population of 1,389,591, making it the 30th most populous county in the United States. The median age in Nassau County is 42.0 years, which is 8.0% above the national median of 38.9 years.
The median household income in Nassau County is $146,202, which ranks #9 of 3,222 counties nationwide. This is 94.5% above the national median of $75,149. The poverty rate is 5.4%, lower than the national rate of 12.6%. The unemployment rate stands at 4.8%.
The median home value in Nassau County is $684,700, 142.9% above the national median. Renters in Nassau County pay a median gross rent of $2,252 per month. The homeownership rate is 81.9%, compared to the national rate of 64.4%.
In Nassau County, 49.7% of residents aged 25 and older hold a bachelor's degree or higher, 47.4% above the national average of 33.7%. Health insurance coverage stands at 96.2% of the population. The average commute time for workers is 39.7 min.
Nassau County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 54.3% of the population, followed by Hispanic or Latino (18.7%) and Asian (non-Hispanic) (12.2%).
All data for Nassau County, New York comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.