Zip Code 11787
Smithtown, New York — Suffolk County
📍 ZIP code 11787 is in Smithtown, Suffolk County, New York.
ZIP code 11787 is located in Smithtown, Suffolk County, New York. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 34,656. The area code for ZIP code 11787 is 631.
Quick Answer
Zip code 11787 is in Smithtown, New York (Suffolk County). It has a population of 34,656, median household income of $141,505, and median home value of $642,200.
Population
34,656
Income
$141,505
Home Value
$642,200
Climate
83°F / 25°F
About Zip Code 11787
Zip code 11787 is located in Smithtown, New York, within Suffolk County. Home to approximately 34,656 residents, this area sits at an elevation of 86 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 631.
The median household income is $141,505 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $642,200, and the cost of living index is 208 (108% above the national average of 100).
Summers average a high of 83°F while winters drop to 25°F. The area receives about 46 in of rain and 32 in of snow annually. The zip code covers 15 square miles of land area and 0.7 square miles of water.
Key Statistics
34,656
$141,505
$642,200
Eastern (EST/EDT)
631
86 ft
15 sq mi
46.9
12,147
Advertisement
Compare With Nearby Zip Codes
| Metric | 11787 | 11788 | 11754 | 11767 | 11725 | 11780 |
|---|---|---|---|---|---|---|
| City | Smithtown, NY | Hauppauge, NY | Kings Park, NY | Nesconset, NY | Commack, NY | Saint James, NY |
| Population | 34,656 | 17,092 | 17,660 | 14,495 | 29,050 | 15,586 |
| Median Income | $141,505 | $148,946 | $123,406 | $148,762 | $168,324 | $141,576 |
| Home Value | $642,200 | $635,700 | $595,300 | $615,800 | $643,000 | $702,900 |
| Cost of Living | 208 | 207 | 185 | 201 | 224 | 222 |
| Median Age | 46.9 | 42.6 | 45.2 | 44.6 | 42.6 | 47.8 |
Cost of Living
100 = National Average. Smithtown's cost of living is 108% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
4.5x
Demographics
Zip code 11787 has a population of 34,656 people with a median age of 46.9. There are 12,147 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Smithtown (11787) population trend from 2010 to 2024
↑ 55.1%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
83°F
25°F
46 in
32 in
Smithtown experiences warm summers with average highs around 83°F. Winters are cool with lows averaging 25°F. With 32 in of annual snowfall, residents should be prepared for significant winter weather.
Advertisement
Housing & Economy
Median Home Value
$642,200
Median Household Income
$141,505
With 12,147 housing units across 15 square miles, 11787 has a housing density of 810 units per square mile. The home price-to-income ratio is 4.5x.
Location & Geography
Latitude
40.8529°
Longitude
-73.2113°
Land Area
15 sq mi
Water Area
0.7 sq mi
Nearby Zip Codes
Zip codes closest to 11787 (Smithtown, NY) with distances:
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 11787's $141,505. A way to compare Smithtown 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 11787 (Smithtown, 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 Smithtown, New York?
Smithtown, New York uses zip code 11787.
What county is zip code 11787 in?
Zip code 11787 is located in Suffolk County, New York.
What is the population of zip code 11787?
The population of zip code 11787 is 34,656 with a median age of 46.9.
Is 11787 in Smithtown, New York?
Yes, zip code 11787 is in Smithtown, Suffolk County, New York. The area code is 631.
Frequently Asked Questions
What city is zip code 11787 in?
Zip code 11787 is in Smithtown, New York. It is part of Suffolk County and uses the Eastern (EST/EDT) timezone.
What is zip code 11787?
Zip code 11787 is a U.S. postal code in Smithtown, New York (Suffolk County). It has a population of 34,656 and covers 15 square miles.
What is the population of zip code 11787?
The population of zip code 11787 (Smithtown, NY) is 34,656 with a median age of 46.9. There are approximately 12,147 housing units in this area.
What is the median income in zip code 11787?
The median household income in zip code 11787 (Smithtown, NY) is $141,505 per year. The cost of living index is 208 (100 = national average).
What is the average home price in zip code 11787?
The median home value in zip code 11787 (Smithtown, NY) is $642,200. The cost of living index is 208 compared to the national average of 100.
What county is zip code 11787 in?
Zip code 11787 is located in Suffolk County, New York. The primary city is Smithtown.
What is the area code for zip code 11787?
Zip code 11787 in Smithtown, NY uses area code 631. It is located in the Eastern (EST/EDT) timezone.
Is zip code 11787 a good place to live?
Zip code 11787 (Smithtown, NY) has a cost of living index of 208 (100 = national average), a median household income of $141,505, and median home values of $642,200. The median age is 46.9. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 11787?
The cost of living index for zip code 11787 (Smithtown, NY) is 208, where 100 represents the national average. This area is above the national average. Median home value: $642,200.
What schools serve zip code 11787?
Zip code 11787 in Smithtown, New York is served by the local school district of Suffolk 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.