How many people live in Suffolk County, NY?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 1.54 million people living in Suffolk County, NY. That makes Suffolk County the 27th-most populous county in the US. It is also the fourth-largest in New York, accounting for 7.7% of the state’s population.
1.54M
population of Suffolk County, NY (2024)
7.7%
County share of the New York population (2024)
About 1.54 million people lived in Suffolk County, NY in 2024.
Population estimates, 2000–2024
What are Suffolk County, NY’s age demographics?
About 291,400 Suffolk County, NY residents are aged 65 and older in 2024. That represents 19% of its population. For comparison, the age group represents 18.9% of New York’s population and 18% in the US overall.
Another 314,500 Suffolk County, NY residents, or 20.5% 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 higher share of Suffolk County, NY's population is aged 45–64 than the US as a whole.
Population estimates by age group, (2024)
What are Suffolk County, NY’s racial and ethnic demographics?
Non-Hispanic white residents make up 61.5% of the Suffolk County, NY population, higher than the national share of 57.5%. Suffolk County, NY also has a larger share of people identifying as Hispanic (23.8%) than the US overall (20%).
In contrast, Suffolk County’s non-Hispanic Black or African American population accounts for 8%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 4.9% of the county, compared with 6.5% 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.
Suffolk County, NY has a higher share of a non-Hispanic white population than New York as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Suffolk County, NY is Riverhead with about 36,100 residents in 2024.
Cities and towns in Suffolk County, NY ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Riverhead | 36,067 |
| 2. | Lindenhurst | 27,160 |
| 3. | Patchogue | 12,447 |
| 4. | Babylon | 12,193 |
| 5. | Lake Grove | 11,109 |
| 6. | Amityville | 9,718 |
| 7. | Port Jefferson | 8,189 |
| 8. | Northport | 7,317 |
| 9. | Southampton | 4,693 |
| 10. | Islandia | 3,651 |
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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.
