Population & Migration Trends (2025 Analysis)
Long Island is home to nearly 3 million people across Nassau and Suffolk Counties, positioning it as one of the most populous suburban regions in the United States. Defined by its dynamic communities, highly regarded school districts, coastal geography, and proximity to New York City, Long Island is a region with both deep historical roots and evolving demographic trends.
Sitting just east of New York City, the Island’s two counties collectively represent a diverse mix of cultures, languages, housing patterns, and lifestyles. The region has high rates of homeownership, elevated household incomes, a growing older-adult population, and a large foreign-born population, especially in Nassau County. Whether you’re a resident seeking the pulse of your community or a business analyzing local markets, understanding these demographic patterns is essential.
Migration Trends: A Region in Transition
Long Island continues to face migration and affordability pressures, especially as housing costs, property taxes, and the cost of living influence where families, retirees, and younger workers choose to live. However, the latest Census population estimates show a more nuanced picture than a simple population-loss story. Nassau County’s estimated population has been roughly stable since the 2020 Census, while Suffolk County has increased modestly in recent estimates.
Domestic out-migration remains an important issue for New York State and the downstate region, but international migration, births, deaths, and local housing patterns all affect county-level population change. As a result, Long Island’s population story is best understood as one of movement, affordability pressure, and demographic change rather than simple decline.
Key Migration & Population Flow Notes
- Long Island’s combined population is now estimated at approximately 2.95 million people based on the latest Census county estimates for Nassau and Suffolk.
- Nassau County has remained close to its 2020 Census population level, with recent estimates showing a slight increase compared with the 2020 population-estimates base.
- Suffolk County has grown modestly since the 2020 Census, making it the larger of Long Island’s two counties by population.
- New York continues to experience substantial movement to other states, including Florida, New Jersey, North Carolina, Pennsylvania, and other destinations that attract relocating households.
- International migration and local population gains can offset some domestic outflow, which is why county population totals may remain stable or grow even while many residents are moving out of state.
These trends illustrate a region at a crossroads: incomes remain high, schools are strong, and Long Island’s suburbs are widely regarded as desirable, but affordability, housing supply, taxes, and commuting patterns continue to shape who stays, who arrives, and who leaves.
Long Island Population & Demographic Snapshot
Population estimates reflect the latest Census county estimates. Household, income, housing, language, and related demographic figures generally reflect 2020–2024 American Community Survey / Census QuickFacts estimates unless otherwise noted.
Key Facts & Details
| Item | Long Island (Total) | Nassau County | Suffolk County |
|---|---|---|---|
| Total population | 2,945,029 estimated combined population | 1,398,939 | 1,546,090 |
| Share of LI population | — | ≈ 47.5% | ≈ 52.5% |
| Median age | ≈ 42 years region-wide estimate | 42.3 | 41.6 |
| Total households | 970,731 | 458,166 | 512,565 |
| Average people per household | ≈ 3.0 | 2.99 | 2.93 |
| Median household income | County range: $130,686–$146,202 | $146,202/yr | $130,686/yr |
| Owner-occupied housing share | High homeownership overall | 81.9% owner | 82.2% owner |
| Foreign-born population | Large immigrant presence, especially in Nassau | 23.3% | 16.8% |
| Language other than English spoken at home | About 27–29% region-wide | 30.7% | 24.8% |
| Bachelor’s degree or higher | Above national average | 49.7% | 40.2% |
| Median owner-occupied home value | High-cost housing market | $684,700 | $578,400 |
Race & Ethnicity Breakdown
Race and ethnicity data should be read carefully because the Census reports “Hispanic or Latino” separately from race, and Hispanic residents may be of any race. The figures below use recent Census QuickFacts categories and therefore may not add up to 100% when race and Hispanic origin are read together.
| Category | Nassau County | Suffolk County |
|---|---|---|
| White alone | 69.3% | 81.8% |
| White alone, not Hispanic or Latino | 53.5% | 61.5% |
| Black alone | 13.5% | 9.8% |
| Asian alone | 14.1% | 5.1% |
| Two or more races | 2.3% | 2.2% |
| Hispanic or Latino, any race | 19.2% | 23.8% |
Together, Nassau and Suffolk reflect a region that remains heavily suburban but increasingly diverse. Nassau has a larger Asian and foreign-born population share, while Suffolk has a larger Hispanic or Latino population share and a larger overall population.
Migration & Population Change Highlights
| Metric | Value | Source / Period |
|---|---|---|
| Long Island combined population | 2,945,029 | U.S. Census county population estimates, 2025 |
| Nassau County population change since 2020 base | +0.2% | U.S. Census population estimates, 2020 base to July 1, 2025 |
| Suffolk County population change since 2020 base | +1.3% | U.S. Census population estimates, 2020 base to July 1, 2025 |
| Largest Long Island county by population | Suffolk County | U.S. Census county population estimates, 2025 |
| Migration issue to watch | Domestic out-migration from New York remains a major policy and demographic concern | Census migration data, state-to-state migration flows, and regional policy analysis |
| Offsetting factor | International migration and local population gains can offset domestic outflow | U.S. Census population-estimates methodology |
The latest population estimates show that Long Island should not be described simply as a shrinking region. The more accurate picture is that Long Island remains large, affluent, and demographically complex, while still facing serious affordability and migration pressures that influence families, workers, retirees, and local governments.
Housing, Income & Household Patterns
Long Island’s demographic profile is closely tied to its housing market. Both Nassau and Suffolk have owner-occupied housing rates above 80%, far higher than many urban regions. Median household income is also high, but so are home values, mortgage costs, rents, and property-related expenses. This combination helps explain why the region can have both strong income levels and persistent affordability concerns.
| Housing / Income Measure | Nassau County | Suffolk County |
|---|---|---|
| Median household income | $146,202 | $130,686 |
| Per capita income | $64,198 | $57,164 |
| Median owner-occupied home value | $684,700 | $578,400 |
| Median gross rent | $2,252 | $2,255 |
| Owner-occupied housing unit rate | 81.9% | 82.2% |
| Persons in poverty | 5.9% | 6.7% |
These figures show why Long Island is often viewed as both economically strong and financially difficult for many households. High incomes help support the region’s quality of life, but high housing costs continue to affect younger residents, first-time buyers, renters, seniors on fixed incomes, and families considering relocation.
A Region of Contrast and Change
Long Island remains a region defined by economic strength, stable community structures, cultural diversity, and strong local identity. However, the contrast between high incomes, high homeownership, and persistent affordability pressure reflects a deeper challenge for policymakers and community leaders.
As housing costs, migration patterns, age trends, and household composition continue to shift, Long Island’s future will increasingly depend on how government, developers, employers, and residents respond to the demographic signals now emerging. This updated snapshot brings those trends into focus and will be updated over time as new Census estimates and public data become available.
Data Sources & Updates
Data Last Updated: June 2026.
The demographic information presented on this page is compiled from official and public data sources, including the U.S. Census Bureau, Census QuickFacts, American Community Survey (ACS) estimates, U.S. Census Population Estimates Program, Census Reporter, and migration-related public datasets and policy analysis from sources such as the U.S. Census Bureau Migration Program and the Empire Center for Public Policy, where applicable. Data is reviewed periodically and updated as new population estimates, migration reports, and demographic surveys become available. Because some government datasets are released on annual or multi-year schedules, certain figures may reflect the most recent finalized estimate period rather than the current calendar year.
