Population & Demographics by Long Island Town (2025)
This page summarizes the latest available population and core demographic indicators for every major town on Long Island in Nassau and Suffolk Counties, using the U.S. Census Bureau’s American Community Survey. It is designed as a quick-reference resource for research, reporting, local background, and general Long Island fact-checking.
Source: U.S. Census Bureau American Community Survey (ACS), including ACS 2023 1-year estimates where available and ACS 2019–2023 5-year estimates for selected indicators.
Important: These are town-level figures for Long Island’s civil towns, not separate totals for every incorporated village, hamlet, or census-designated place. ACS figures are survey estimates, so margins of error apply and smaller year-to-year differences should be interpreted cautiously.
Methodology
- Population: U.S. Census Bureau ACS 2023 1-year estimates where available; otherwise ACS 2019–2023 5-year estimates.
- Median household income: ACS 2019–2023 5-year estimates, inflation-adjusted to 2023 dollars.
- Median age and % Bachelor’s degree or higher: ACS 2023 1-year estimates where available; otherwise ACS 2019–2023 5-year estimates.
- Bachelor’s+ refers to residents age 25 and older with a bachelor’s degree or higher.
- Figures are rounded, and Census margins of error apply. For smaller towns in particular, use caution when comparing very small differences across places or years.
Nassau County Towns
| Town | Population (2023) | Median Household Income (2019–2023) | Median Age (2023) | Bachelor’s+ (2023) |
|---|---|---|---|---|
| Hempstead (Town) | 785,683 | $134,979 | 40.9 | 44% |
| North Hempstead (Town) | 235,780 | $152,874 | 45.1 | 57.6% |
| Oyster Bay (Town) | 297,782 | $156,073 | 43.6 | 54.1% |
Suffolk County Towns
| Town | Population (2023) | Median Household Income (2019–2023) | Median Age (2023) | Bachelor’s+ (2023) |
|---|---|---|---|---|
| Brookhaven (Town) | 487,817 | $119,160 | 40.0 | 38.0% |
| Islip (Town) | 336,813 | $118,465 | 39.5 | 32.2% |
| Huntington (Town) | 202,938 | $164,196 | 46.0 | 56.1% |
| Babylon (Town) | 217,034 | $125,008 | 38.6 | 33.5% |
| Smithtown (Town) | 115,461 | $149,894 | 45.8 | 48.8% |
| Southampton (Town) | 69,697 | $123,263 | 51.1 | 47.4% |
| East Hampton (Town) | 28,405 | $128,938 | 50.7 | 47.1% |
| Riverhead (Town) | 35,826 | $93,595 | 51.6 | 34.9% |
| Southold (Town) | 23,801 | $109,152 | 52.9 | 43.3% |
| Shelter Island (Town) | 3,279 | $128,976 | 59.5 | 55.2% |
Overall, Long Island’s town-level demographic profile shows a region with large suburban population centers, high household incomes, and notable differences between western Nassau, central Suffolk, and the East End. Larger towns such as Hempstead, Brookhaven, Islip, Oyster Bay, and Babylon account for much of Long Island’s population, while smaller East End towns such as Southold, East Hampton, and Shelter Island reflect older median age figures and smaller year-round populations.
© 2026 LongIslandGuide.com • Compiled from U.S. Census Bureau American Community Survey data. Check Census releases for the newest updates.
