Zip Code 11791
Syosset, New York — Nassau County
📍 ZIP code 11791 is in Syosset, Nassau County, New York.
ZIP code 11791 is located in Syosset, Nassau County, New York. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 25,194. The area code for ZIP code 11791 is 631.
Quick Answer
Zip code 11791 is in Syosset, New York (Nassau County). It has a population of 25,194, median household income of $204,357, and median home value of $918,900.
Population
25,194
Income
$204,357
Home Value
$918,900
Climate
83°F / 25°F
About Zip Code 11791
Zip code 11791 is located in Syosset, New York, within Nassau County. Home to approximately 25,194 residents, this area sits at an elevation of 212 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 631.
The median household income is $204,357 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $918,900, and the cost of living index is 250 (150% above the national average of 100).
Summers average a high of 83°F while winters drop to 25°F. The area receives about 49 in of rain and 26 in of snow annually. The zip code covers 13 square miles of land area and 0.3 square miles of water.
Key Statistics
25,194
$204,357
$918,900
Eastern (EST/EDT)
631
212 ft
13 sq mi
43
8,316
Advertisement
Compare With Nearby Zip Codes
| Metric | 11791 | 11797 | 11732 | 11753 | 11771 | 11724 |
|---|---|---|---|---|---|---|
| City | Syosset, NY | Syosset, NY | East Norwich, NY | Hicksville, NY | Oyster Bay, NY | Cold Spring Harbor, NY |
| Population | 25,194 | 9,338 | 3,546 | 12,729 | 10,173 | 2,956 |
| Median Income | $204,357 | $183,472 | $120,707 | $185,000 | $163,134 | $250,001 |
| Home Value | $918,900 | $1,005,500 | $753,400 | $950,100 | $921,300 | $1,571,600 |
| Cost of Living | 250 | 250 | 220 | 250 | 250 | 250 |
| Median Age | 43 | 50.1 | 46.9 | 43.7 | 41.8 | 40.2 |
Cost of Living
100 = National Average. Syosset's cost of living is 150% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
4.5x
Demographics
Zip code 11791 has a population of 25,194 people with a median age of 43. There are 8,316 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Syosset (11791) population trend from 2010 to 2024
↑ 33.7%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
83°F
25°F
49 in
26 in
Syosset experiences warm summers with average highs around 83°F. Winters are cool with lows averaging 25°F. The area receives about 26 in of snow per year.
Advertisement
Housing & Economy
Median Home Value
$918,900
Median Household Income
$204,357
With 8,316 housing units across 13 square miles, 11791 has a housing density of 640 units per square mile. The home price-to-income ratio is 4.5x.
Location & Geography
Latitude
40.8283°
Longitude
-73.5059°
Land Area
13 sq mi
Water Area
0.3 sq mi
Nearby Zip Codes
Zip codes closest to 11791 (Syosset, NY) with distances:
All Zip Codes in Syosset, NY
Other zip codes serving Syosset:
Related Cities in New York
Explore zip codes in other New York cities:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 11791's $204,357. A way to compare Syosset to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 11791 (Syosset, NY). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
Explore New York
Popular "Near Me" Searches
Advertisement
People Also Ask
What zip code is Syosset, New York?
Syosset, New York uses zip code 11791 along with 1 other zip codes.
What county is zip code 11791 in?
Zip code 11791 is located in Nassau County, New York.
What is the population of zip code 11791?
The population of zip code 11791 is 25,194 with a median age of 43.
Is 11791 in Syosset, New York?
Yes, zip code 11791 is in Syosset, Nassau County, New York. The area code is 631.
Frequently Asked Questions
What city is zip code 11791 in?
Zip code 11791 is in Syosset, New York. It is part of Nassau County and uses the Eastern (EST/EDT) timezone.
What is zip code 11791?
Zip code 11791 is a U.S. postal code in Syosset, New York (Nassau County). It has a population of 25,194 and covers 13 square miles.
What is the population of zip code 11791?
The population of zip code 11791 (Syosset, NY) is 25,194 with a median age of 43. There are approximately 8,316 housing units in this area.
What is the median income in zip code 11791?
The median household income in zip code 11791 (Syosset, NY) is $204,357 per year. The cost of living index is 250 (100 = national average).
What is the average home price in zip code 11791?
The median home value in zip code 11791 (Syosset, NY) is $918,900. The cost of living index is 250 compared to the national average of 100.
What county is zip code 11791 in?
Zip code 11791 is located in Nassau County, New York. The primary city is Syosset.
What is the area code for zip code 11791?
Zip code 11791 in Syosset, NY uses area code 631. It is located in the Eastern (EST/EDT) timezone.
Is zip code 11791 a good place to live?
Zip code 11791 (Syosset, NY) has a cost of living index of 250 (100 = national average), a median household income of $204,357, and median home values of $918,900. The median age is 43. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 11791?
The cost of living index for zip code 11791 (Syosset, NY) is 250, where 100 represents the national average. This area is above the national average. Median home value: $918,900.
What schools serve zip code 11791?
Zip code 11791 in Syosset, New York is served by the local school district of Nassau County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
People Also Searched For
Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.