Census-designated place · New York
Mount Sinai, New York
Mount Sinai, census-designated place, in Suffolk County, New York. Mount Sinai had 11,093 people in the ACS 2020-2024 5-year estimates (±1,142). GEOID 3649066.
Residents, 2020-2024
11,093
±1,142 (90% margin)
2020 Census count: 11,623
Median household income
$162,188
±$24,319 (90% margin)
New York: $85,974
Median home value
$661,200
±$20,281 (90% margin)
New York: $423,800
Median gross rent
$3,088
±$797 (90% margin)
New York: $1,621
Where is Mount Sinai and what county is it in?
Mount Sinai is a census-designated place: an unincorporated community the Census Bureau draws for counting, with no city government of its own, in Suffolk County, New York. It covers 6.0 square miles of land, 1,937 residents per square mile in 2020.
Mount Sinai is in the New York-Newark-Jersey City, NY-NJ metropolitan statistical area, which takes in 22 counties (Census Bureau delineation, July 2023).
Mount Sinai lies entirely within the Town of Brookhaven, a town with its own local government (2020 census blocks).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Mount Sinai, and is it growing?
The 2020-2024 American Community Survey puts Mount Sinai's population at 11,093 (±1,142). The 2020 Census counted 11,623 residents.
The Census Bureau publishes yearly population estimates for incorporated places only; Mount Sinai is a census-designated place, so its figures come from the ACS and the 2020 Census.
| Measure | Mount Sinai | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 11,093 ±1,142 | 1,530,146 | no clear change |
| Households | 3,996 ±325 | 512,565 | no clear change |
| Average household size | 2.77 ±0.17 | 2.93 | no clear change |
| Housing units | 4,192 ±276 | 580,772 | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Mount Sinai?
The median resident of Mount Sinai is 46.6 years old; 22.3% are under 18 and 26.4% are 65 or older. The largest group is non-Hispanic white residents at 78.0%, then Hispanic or Latino residents (of any race) at 14.3%. 8.1% of residents were born outside the United States.
| Measure | Mount Sinai | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 46.6 ±2.6 | 41.7 | no clear change |
| Under 18 years | 22.3% ±2.5 pts | 20.8% | – |
| 65 years and over | 26.4% ±3.2 pts | 17.9% | – |
| Male | 49.7% ±2.4 pts | 49.6% | – |
| Hispanic or Latino (any race) | 14.3% ±5.0 pts | 22.8% | no clear change |
| White alone, not Hispanic | 78.0% ±4.8 pts | 62.0% | no clear change |
| Black or African American alone, not Hispanic | 1.9% ±2.4 pts | 6.9% | – |
| Asian alone, not Hispanic | 3.1% ±1.3 pts | 4.4% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.4 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.4 pts | 0.0% | – |
| Two or more races, not Hispanic | 2.7% ±2.2 pts | 3.0% | – |
| Some other race alone, not Hispanic | 0.0% ±0.1 pts | 0.7% | – |
| Born outside the United States | 8.1% ±2.5 pts | 16.8% | no clear change |
| Speak a language other than English at home (age 5+) | 10.6% ±2.5 pts | 24.8% | – |
| Civilian veterans (age 18+) | 7.1% ±2.3 pts | 4.0% | – |
| With a disability | 8.9% ±2.9 pts | 10.5% | – |
| No health insurance coverage | 1.8% ±1.2 pts | 4.7% | – |
| High school graduate or higher (age 25+) | 95.7% ±1.8 pts | 90.4% | – |
| Bachelor's degree or higher (age 25+) | 50.7% ±5.0 pts | 40.2% | no clear change |
| Graduate or professional degree (age 25+) | 26.1% ±3.2 pts | 18.6% | – |
| Lived in the same house a year earlier | 92.9% ±3.7 pts | 92.8% | – |
| Moved from another state in the past year | 0.1% ±0.2 pts | 0.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Mount Sinai earn?
Half of Mount Sinai's 3,996 households earn less than $162,188 a year (±$24,319), against $130,686 in Suffolk County and $85,974 in New York. In 2015-2019 it was $167,344 in 2024 dollars; the margins of error cannot tell the two periods apart. 1.6% of residents live below the poverty line.
| Measure | Mount Sinai | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $162,188 ±$24,319 | $130,686 | no clear change |
| Mean household income | $184,174 ±$17,259 | $166,220 | – |
| Per capita income | $66,740 ±$5,341 | $57,164 | no clear change |
| People below the poverty line | 1.6% ±0.7 pts | 6.4% | – |
| Children under 18 below the poverty line | 0.0% ±1.7 pts | 7.1% | – |
| Households receiving SNAP | 1.4% ±1.4 pts | 7.2% | – |
| Households with a computer | 97.4% ±1.8 pts | 96.5% | – |
| Households with a broadband subscription | 96.4% ±2.0 pts | 93.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Mount Sinai?
Owners occupy 92.6% of Mount Sinai's occupied homes and renters 7.4%. The median owner-occupied home is valued at $661,200 by its owner (±$20,281). The median renter pays $3,088 a month including utilities, and 52.5% of renters pay 35% or more of their income on rent.
| Measure | Mount Sinai | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $661,200 ±$20,281 | $578,400 | +$102,342 |
| Median gross rent | $3,088 ±$797 | $2,255 | – |
| Renters paying 35% or more of income on rent | 52.5% ±30.9 pts | 49.0% | – |
| Median monthly owner costs, with a mortgage | $3,344 ±$143 | $3,320 | – |
| Owner-occupied homes | 92.6% ±3.8 pts | 82.2% | no clear change |
| Renter-occupied homes | 7.4% ±3.8 pts | 17.8% | – |
| Housing units | 4,192 ±276 | 580,772 | no clear change |
| Homeowner vacancy rate | 2.3% ±2.8 pts | 0.6% | – |
| Rental vacancy rate | 0.0% ±13.3 pts | 4.1% | – |
| Single-family detached homes | 80.8% ±4.2 pts | 79.7% | – |
| Mobile homes | 0.0% ±1.0 pts | 1.3% | – |
| Built 2020 or later | 6.3% ±3.2 pts | 0.7% | – |
| Built 2010 to 2019 | 2.8% ±1.6 pts | 3.7% | – |
| Built 1939 or earlier | 3.2% ±1.7 pts | 9.1% | – |
| Households with no vehicle | 3.0% ±1.6 pts | 5.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Mount Sinai work and get to work?
74.6% of Mount Sinai's workers drive alone and 12.9% work from home. The average trip to work takes 37.3 minutes. The unemployment rate in 2020-2024 averaged 2.3%.
| Measure | Mount Sinai | Suffolk County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 58.8% ±3.8 pts | 65.5% | – |
| Unemployment rate | 2.3% ±1.5 pts | 4.7% | −3.1 pts |
| Drove alone to work | 74.6% ±6.3 pts | 72.1% | – |
| Carpooled | 9.1% ±5.6 pts | 7.5% | – |
| Public transportation | 2.2% ±1.6 pts | 4.8% | – |
| Walked | 0.2% ±0.3 pts | 1.4% | – |
| Worked from home | 12.9% ±3.5 pts | 12.0% | +7.1 pts |
| Mean travel time to work | 37.3 min ±5.0 | 31.1 min | +7.8 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Mount Sinai?
3 census tracts lie mostly in Mount Sinai, and 2 more reach into it (2020 census blocks). Their median household incomes run from $134,985 (Tract 1583.06) to $161,625 (Tract 1583.22).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 1583.06Suffolk County | 5,165 | $134,985 |
| Tract 1583.22Suffolk County | 2,219 | $161,625 |
| Tract 1582.05Suffolk County | 1,554 | $147,308 |
| Tract 1583.04Suffolk County | 6,910 | $149,280 |
| Tract 1582.09Suffolk County | 3,269 | $81,042 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Mount Sinai) · Census block assignment files
How does Mount Sinai compare with other places in New York?
Mount Sinai ranks 126th of 1,623 places in New York with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population (ACS 2020-2024) | 317th | 1,657 |
| Residents per square mile | 437th | 1,657 |
| Median household income | 126th | 1,623 |
| Per capita income | 216th | 1,653 |
| Median home value | 202nd | 1,637 |
| Median gross rent | 48th | 1,515 |
| Poverty rate | 1,326th | 1,331 |
| Bachelor's degree or higher | 329th | 1,640 |
| Median age | 494th | 1,654 |
| Owner-occupied share | 163rd | 1,639 |
| Work from home | 647th | 1,350 |
| Travel time to work | 142nd | 1,652 |
Mount Sinai's figures with every place in New York (CSV)
Every place in New York, sortable · Compare Mount Sinai with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Mount Sinai?
14 of the 57 figures for Mount Sinai on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Mount Sinai are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.