🇺🇸 United States ZIP Code

STANDARD

11791

Syosset

ZIP Code 11791 is a standard zip code serving Syosset, Syosset, New York (NY), in Nassau County, United States. It has an estimated population of 25,076 with a median household income of $139,565. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: New York (NY)
County: Nassau
City: Syosset
Timezone: America/New_York

Coordinates

Latitude: 40.814600
Longitude: -73.502400

Geographic Details

Land Area: 12.98 mi²
Water Area: 0.28 mi²
Population Density: 1932.0 people per mi² (80th percentile)
Bounding Box: 40.876613°N, 40.784554°S, -73.455261°E, -73.555534°W

With 25,076 residents spread across 12.98 square miles, this area has a population density of 1932.0 people per square mile.

Demographics

25,076

Population

85th percentile

$139,565

Median Income

95th percentile

$644,200

Median Home Value

95th percentile

12.98 mi²

Land Area

The median household income in 11791 is $139,565, and the median home value is $644,200. This places the area in the top 25% nationally for household income.

Housing

8,375

Total Units

8,131

Occupied Units

97.1%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Syosset, NY.

11773

Syosset

Similar ZIP Codes in New York

ZIP codes with similar median household income in New York.

10803

Pelham

$140,000

10956

New City

$119,764

11566

Merrick

$126,532

11109

Long Island City

$125,871

10004

New York

$129,313

10804

New Rochelle

$157,950

10930

Highland Mills

$125,356

10280

New York

$129,574

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.