Nassau County, NY Population

Overview

1.39 million

Total Population

41.8

Median age

50.93%

Female population %

96.4:100

Gender ratio (M:F)

55-59 years

Largest age group

54.9

Total dependency ratio

White

Largest racial group

239,038

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

Nassau County's population is old compared to the rest of the country:

The median age in Nassau County is 41.8, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Nassau County's population under 18 was 21.71%, compared to the 22.51% nationwide.
Nassau County's elderly or the senior population (over 65 age) was 17.73% as compared to 16.04% nationwide.
Of the total population in Nassau County, 17.71% were under the age of 15, 18.46% aged 15 to 29, 46.11% aged 30 to 64, 14.95% aged 65 to 84, and 2.78% were 85 years of age and older.

There are 25,862 more females than males in Nassau County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.93% females and 49.07% males in Nassau County, NY.
The Nassau County, NY gender ratio is 96.4:100 i.e. 96.4 men to 100 women (0.964).
For male population, the largest age group is 55-59 years with a population of 50,834.
For the female population, the largest age group is 55-59 years with a population of 53,269.

Nassau County's population has become increasingly diverse:

Racial distribution of Nassau County population: 64.56% are White, 11.54% are Black or African American, 0.26% are American Indian and Alaska Native, 10.52% are Asian, 0.02% are Native Hawaiian and other Pacific Islander, 7.55% are some other race and 5.54% are multiracial.
Nassau County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 239,038 is Hispanic or Latino (of any race), and 1.15 million (82.82% of the total population) is Non-Hispanic.
The largest racial group in Nassau County is White with a population of 898,504 (64.56% of the total population).

Nassau County's population has already reached its peak and is showing a trend of decline:

The peak population was 1,391,112 in the year 2021
From 2000 to 2010, Nassau County's population increased by 5,402 (0.40%), as compared to the national growth of 9.63%.
From 2010 to 2020, Nassau County's population increased by 48,917 (3.65%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, Nassau County's population was lowest in year 2007 at 1,305,988.