Zip Code 06340
Groton, Connecticut — New London County
📍 ZIP code 06340 is in Groton, New London County, Connecticut.
ZIP code 06340 is located in Groton, New London County, Connecticut. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 29,833. The area code for ZIP code 06340 is 203.
Quick Answer
Zip code 06340 is in Groton, Connecticut (New London County). It has a population of 29,833, median household income of $77,768, and median home value of $275,500.
Population
29,833
Income
$77,768
Home Value
$275,500
Climate
81°F / 24°F
About Zip Code 06340
Zip code 06340 is located in Groton, Connecticut, within New London County. Home to approximately 29,833 residents, this area sits at an elevation of 39 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 203.
The median household income is $77,768 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $275,500, and the cost of living index is 94 (6% below the national average of 100).
Summers average a high of 81°F while winters drop to 24°F. The area receives about 49 in of rain and 25 in of snow annually. The zip code covers 22.9 square miles of land area and 5.3 square miles of water.
Key Statistics
29,833
$77,768
$275,500
Eastern (EST/EDT)
203
39 ft
22.9 sq mi
33.2
14,441
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Compare With Nearby Zip Codes
| Metric | 06340 | 06320 | 06355 | 06375 | 06335 | 06385 |
|---|---|---|---|---|---|---|
| City | Groton, CT | New London, CT | Mystic, CT | Quaker Hill, CT | Gales Ferry, CT | Waterford, CT |
| Population | 29,833 | 27,275 | 12,223 | 3,667 | 6,100 | 15,900 |
| Median Income | $77,768 | $60,224 | $132,367 | $104,427 | $126,121 | $110,375 |
| Home Value | $275,500 | $234,800 | $416,600 | $294,600 | $296,800 | $334,900 |
| Cost of Living | 94 | 77 | 150 | 115 | 110 | 119 |
| Median Age | 33.2 | 35.1 | 53.3 | 49.7 | 37.4 | 46.9 |
Cost of Living
100 = National Average. Groton's cost of living is 6% below the national average.
vs. State Avg
Below
Affordability
Affordable
Income-to-Home
3.5x
Demographics
Zip code 06340 has a population of 29,833 people with a median age of 33.2. There are 14,441 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Groton (06340) population trend from 2010 to 2024
↑ 11.2%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
81°F
24°F
49 in
25 in
Groton experiences warm summers with average highs around 81°F. Winters are cool with lows averaging 24°F. The area receives about 25 in of snow per year.
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Housing & Economy
Median Home Value
$275,500
Median Household Income
$77,768
With 14,441 housing units across 22.9 square miles, 06340 has a housing density of 631 units per square mile. The home price-to-income ratio is 3.5x.
Location & Geography
Latitude
41.3544°
Longitude
-72.0403°
Land Area
22.9 sq mi
Water Area
5.3 sq mi
Nearby Zip Codes
Zip codes closest to 06340 (Groton, CT) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 06340's $77,768. A way to compare Groton 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 06340 (Groton, 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 Groton, Connecticut?
Groton, Connecticut uses zip code 06340.
What county is zip code 06340 in?
Zip code 06340 is located in New London County, Connecticut.
What is the population of zip code 06340?
The population of zip code 06340 is 29,833 with a median age of 33.2.
Is 06340 in Groton, Connecticut?
Yes, zip code 06340 is in Groton, New London County, Connecticut. The area code is 203.
Frequently Asked Questions
What city is zip code 06340 in?
Zip code 06340 is in Groton, Connecticut. It is part of New London County and uses the Eastern (EST/EDT) timezone.
What is zip code 06340?
Zip code 06340 is a U.S. postal code in Groton, Connecticut (New London County). It has a population of 29,833 and covers 22.9 square miles.
What is the population of zip code 06340?
The population of zip code 06340 (Groton, CT) is 29,833 with a median age of 33.2. There are approximately 14,441 housing units in this area.
What is the median income in zip code 06340?
The median household income in zip code 06340 (Groton, CT) is $77,768 per year. The cost of living index is 94 (100 = national average).
What is the average home price in zip code 06340?
The median home value in zip code 06340 (Groton, CT) is $275,500. The cost of living index is 94 compared to the national average of 100.
What county is zip code 06340 in?
Zip code 06340 is located in New London County, Connecticut. The primary city is Groton.
What is the area code for zip code 06340?
Zip code 06340 in Groton, CT uses area code 203. It is located in the Eastern (EST/EDT) timezone.
Is zip code 06340 a good place to live?
Zip code 06340 (Groton, CT) has a cost of living index of 94 (100 = national average), a median household income of $77,768, and median home values of $275,500. The median age is 33.2. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 06340?
The cost of living index for zip code 06340 (Groton, CT) is 94, where 100 represents the national average. This area is below the national average. Median home value: $275,500.
What schools serve zip code 06340?
Zip code 06340 in Groton, Connecticut is served by the local school district of New London 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.