Zip Code 06840
Stamford, Connecticut — Fairfield County
📍 ZIP code 06840 is in Stamford, Fairfield County, Connecticut.
ZIP code 06840 is located in Stamford, Fairfield County, Connecticut. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 20,704. The area code for ZIP code 06840 is 203.
Quick Answer
Zip code 06840 is in Stamford, Connecticut (Fairfield County). It has a population of 20,704, median household income of $250,001, and median home value of $1,534,100.
Population
20,704
Income
$250,001
Home Value
$1,534,100
Climate
85°F / 22°F
About Zip Code 06840
Zip code 06840 is located in Stamford, Connecticut, within Fairfield County. Home to approximately 20,704 residents, this area sits at an elevation of 335 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 203.
The median household income is $250,001 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $1,534,100, and the cost of living index is 250 (150% above the national average of 100).
Summers average a high of 85°F while winters drop to 22°F. The area receives about 52 in of rain and 34 in of snow annually. The zip code covers 22.2 square miles of land area and 0.3 square miles of water.
Key Statistics
20,704
$250,001
$1,534,100
Eastern (EST/EDT)
203
335 ft
22.2 sq mi
42.5
7,668
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Compare With Nearby Zip Codes
| Metric | 06840 | 06850 | 06903 | 06907 | 06897 | 06851 |
|---|---|---|---|---|---|---|
| City | Stamford, CT | Norwalk, CT | Stamford, CT | Stamford, CT | Wilton, CT | Norwalk, CT |
| Population | 20,704 | 19,774 | 13,630 | 9,071 | 18,439 | 28,591 |
| Median Income | $250,001 | $121,910 | $203,438 | $104,526 | $227,165 | $106,978 |
| Home Value | $1,534,100 | $562,900 | $893,900 | $555,900 | $891,300 | $565,100 |
| Cost of Living | 250 | 174 | 250 | 175 | 250 | 165 |
| Median Age | 42.5 | 40 | 50.8 | 36.5 | 43.7 | 42.3 |
Cost of Living
100 = National Average. Stamford's cost of living is 150% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
6.1x
Demographics
Zip code 06840 has a population of 20,704 people with a median age of 42.5. There are 7,668 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Stamford (06840) population trend from 2010 to 2024
↑ 14.1%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
85°F
22°F
52 in
34 in
Stamford experiences warm summers with average highs around 85°F. Winters are cool with lows averaging 22°F. With 34 in of annual snowfall, residents should be prepared for significant winter weather.
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Housing & Economy
Median Home Value
$1,534,100
Median Household Income
$250,001
With 7,668 housing units across 22.2 square miles, 06840 has a housing density of 345 units per square mile. The home price-to-income ratio is 6.1x.
Location & Geography
Latitude
41.1604°
Longitude
-73.5001°
Land Area
22.2 sq mi
Water Area
0.3 sq mi
Nearby Zip Codes
Zip codes closest to 06840 (Stamford, CT) with distances:
All Zip Codes in Stamford, CT
Other zip codes serving Stamford:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 06840's $250,001. A way to compare Stamford 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 06840 (Stamford, CT). 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.
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People Also Ask
What zip code is Stamford, Connecticut?
Stamford, Connecticut uses zip code 06840 along with 7 other zip codes.
What county is zip code 06840 in?
Zip code 06840 is located in Fairfield County, Connecticut.
What is the population of zip code 06840?
The population of zip code 06840 is 20,704 with a median age of 42.5.
Is 06840 in Stamford, Connecticut?
Yes, zip code 06840 is in Stamford, Fairfield County, Connecticut. The area code is 203.
Frequently Asked Questions
What city is zip code 06840 in?
Zip code 06840 is in Stamford, Connecticut. It is part of Fairfield County and uses the Eastern (EST/EDT) timezone.
What is zip code 06840?
Zip code 06840 is a U.S. postal code in Stamford, Connecticut (Fairfield County). It has a population of 20,704 and covers 22.2 square miles.
What is the population of zip code 06840?
The population of zip code 06840 (Stamford, CT) is 20,704 with a median age of 42.5. There are approximately 7,668 housing units in this area.
What is the median income in zip code 06840?
The median household income in zip code 06840 (Stamford, CT) is $250,001 per year. The cost of living index is 250 (100 = national average).
What is the average home price in zip code 06840?
The median home value in zip code 06840 (Stamford, CT) is $1,534,100. The cost of living index is 250 compared to the national average of 100.
What county is zip code 06840 in?
Zip code 06840 is located in Fairfield County, Connecticut. The primary city is Stamford.
What is the area code for zip code 06840?
Zip code 06840 in Stamford, CT uses area code 203. It is located in the Eastern (EST/EDT) timezone.
Is zip code 06840 a good place to live?
Zip code 06840 (Stamford, CT) has a cost of living index of 250 (100 = national average), a median household income of $250,001, and median home values of $1,534,100. The median age is 42.5. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 06840?
The cost of living index for zip code 06840 (Stamford, CT) is 250, where 100 represents the national average. This area is above the national average. Median home value: $1,534,100.
What schools serve zip code 06840?
Zip code 06840 in Stamford, Connecticut is served by the local school district of Fairfield 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.
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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.