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Get ready-to-use data, reports, analysis, and visualizations covering the demographics of Suffolk County, New York based on the current United States Census Bureau's 2023 American Community Survey (ACS) 5-Year Estimates.

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Suffolk County, New York Demographics: Sex by Age

Population by age and sex in Suffolk County, New York, based on 2023 ACS data
Source: U.S. Census Bureau, ACS 5-Year Estimates

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the total population of Suffolk County, New York is 1,525,680. The median age of the population in Suffolk County, New York is 41.7. The median age for males is 40.4 years, and for females, it is 43.1 years.

The age distribution of the population in Suffolk County, New York is as follows:

  • Under 5 years: 5.31%
  • 5–17 years (children): 15.62%
  • 18–24 years (young adults): 8.92%
  • 25–34 years: 12.13%
  • 35–54 years: 25.58%
  • 55–64 years: 14.97%
  • 65 years and over (seniors): 17.47%

The total dependency ratio in Suffolk County, New York is 62.34%. The youth dependency ratio is 33.98%, and the old-age dependency ratio is 28.36%. In demographic terms, the dependency ratio measures the size of the population typically not in the labor force (children and older adults) relative to those of working age.

Suffolk County, New York Demographics: Population by Race & Ethnicity

Population by race and ethnicity in Suffolk County, New York based on 2023 U.S. Census Bureau ACS data
Source: U.S. Census Bureau, ACS 5-Year Estimates

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the population in Suffolk County, New York by race and ethnicity (racial demographics) is as follows:

  • White: 63.15%
  • Black/African American: 6.84%
  • American Indian and Alaska Native: 0.15%
  • Asian: 4.22%
  • Native Hawaiian or Other Pacific Islander: 0.01%
  • Some other race: 0.74%
  • Two or more races: 2.66%
  • Hispanic or Latino: 22.22%

The diversity index score in Suffolk County, New York is 54.46%, suggesting a moderate level of diversity.

Suffolk County, New York Demographics: Household Income

Median and distribution of household income in Suffolk County, New York based on 2023 American Community Survey (ACS)
Source: U.S. Census Bureau, ACS 5-Year Estimates

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Suffolk County, New York over the past 12 months, adjusted for 2023 inflation, was $128,329.

The distribution of household income by income bracket in Suffolk County, New York is as follows:

  • Less than $20,000: 6.24%
  • $20,000–$34,999: 5.70%
  • $35,000–$49,999: 5.86%
  • $50,000–$74,999: 10.60%
  • $75,000–$149,999: 29.76%
  • $150,000 or more: 41.85%

Suffolk County, New York Demographics: Educational Attainment

Educational attainment levels of the population in Suffolk County, New York based on 2023 American Community Survey (ACS) data
Source: U.S. Census Bureau, ACS 5-Year Estimates

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the breakdown of the total population of Suffolk County, New York, age 25 and older, by educational level is as follows:

  • Less than high school graduate: 9.52%
  • High school graduate (incl. equivalency): 24.82%
  • Some college or associate's degree: 25.80%
  • Bachelor's Degree: 21.46%
  • Graduate or professional degree: 18.40%

In Suffolk County, New York, 39.86% of the population has a bachelor's degree or higher, while 90.48% are high school graduates or higher.

Suffolk County, New York Demographics: Health Insurance Coverage Status by Sex by Age

Health insurance coverage by age and sex in Suffolk County, New York from the 2023 ACS
Source: U.S. Census Bureau, ACS 5-Year Estimates

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the uninsured rate in Suffolk County, New York is 4.63%.

Rates of people in Suffolk County, New York lacking health insurance coverage, by age group and sex are as follows:

  • Under 18: 3.20% of males and 2.72% of females are uninsured
  • Ages 18–34: 4.66% of males and 4.27% of females are uninsured
  • Ages 35–64: 8.76% of males and 5.62% of females are uninsured
  • Ages 65 and older: 0.34% of males and 1.78% of females are uninsured

Suffolk County, New York Demographics: Nativity and Citizenship Status in the United States

Chart showing the breakdown of U.S. citizenship status and nativity in 2023 for the Suffolk County, New York, based on ACS 5-Year Estimates
Source: U.S. Census Bureau, ACS 5-Year Estimates

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 93.36% of people living in Suffolk County, New York are U.S. citizens. This includes individuals born in the United States, Puerto Rico, or U.S. Island Areas, those born abroad to American parents, and those who became citizens through naturalization. 9.94% of the population obtained U.S. citizenship through the naturalization process. In Suffolk County, New York, 9.94% of the population are naturalized immigrants, who obtained U.S. citizenship through the immigration and naturalization process.

Suffolk County, New York Demographics: Means of Transportation to Work

How people commute to work in Suffolk County, New York based on 2023 U.S. Census Bureau ACS data on transportation methods
Source: U.S. Census Bureau, ACS 5-Year Estimates

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the means of transportation to work for the population of Suffolk County, New York are distributed as follows:

  • Car, truck, or van: 80.84%
  • Public transportation (excluding taxicab): 5.24%
  • Bicycle: 0.22%
  • Walked: 1.30%
  • Taxicab, motorcycle, or other means: 1.70%
  • Worked from home: 10.70%

Frequently Asked Questions

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the age breakdown of the population of Suffolk County, New York is as follows:

  • Under 5: 5.31%
  • Ages 5–17: 15.62%
  • Ages 18–24: 8.92%
  • Ages 25–34: 12.13%
  • Ages 35–54: 25.58%
  • Ages 55–64: 14.97%
  • 65 or older: 17.47%

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the racial demographics of the population of Suffolk County, New York are as follows:

  • White: 63.15%
  • Black/African American: 6.84%
  • American Indian and Alaska Native: 0.15%
  • Asian: 4.22%
  • Native Hawaiian or Other Pacific Islander: 0.01%
  • Some other race: 0.74%
  • Two or more races: 2.66%
  • Hispanic or Latino: 22.22%

* Hispanic includes respondents of any race. Other categories are non-Hispanic.

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the distribution of household income in Suffolk County, New York by income bracket is as follows:

  • Less than $20,000: 6.24%
  • $20,000–$34,999: 5.70%
  • $35,000–$49,999: 5.86%
  • $50,000–$74,999: 10.60%
  • $75,000–$149,999: 29.76%
  • $150,000 or more: 41.85%

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, the median household income in Suffolk County, New York in the past 12 months, in 2023 inflation-adjusted dollars, was $128,329.

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 63.15% of the population in Suffolk County, New York identifies as White alone (not Hispanic or Latino).

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 6.84% of the population in Suffolk County, New York identifies as Black or African American alone (not Hispanic or Latino).

According to the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates, 4.63% of the population of Suffolk County, New York lacks health insurance coverage.

The detailed breakdown by age and sex is as follows:

  • Under 18: 3.20% of males and 2.72% of females
  • Ages 18–34: 4.66% of males and 4.27% of females
  • Ages 35–64: 8.76% of males and 5.62% of females
  • Ages 65 and over: 0.34% of males and 1.78% of females