06340 ZIP Code — Groton, CT
New London County, Connecticut
ZIP code 06340 is located in Groton, Connecticut, within New London County. It covers approximately 22.54 square miles and serves a population of 29,672 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 860.
About ZIP code 06340
The housing stock consists of a mix of housing types. Most homes were built in the 1970s, giving the area an established character. Median home value is $248,000. Renters make up the majority at 55%, typical of denser urban areas.
Median household income is $76,138.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 18 minutes is near the national average.
Educational attainment is near the national average, with 35% of residents holding a bachelor's degree or higher.
29,672
population
22.54
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
06340 ZIP code map
Cities in ZIP code 06340
Below are the cities the US Postal Service accepts for ZIP code 06340. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Groton | Acceptable |
| Groton | Preferred |
Nearby ZIP codes
06355 Mystic (3.5 mi)
06320 New London (3.6 mi)
06375 Quaker Hill (5.6 mi)
06335 Gales Ferry (5.8 mi)
06339 Ledyard (6.2 mi)
06385 Waterford (6.3 mi)
06378 Stonington (6.5 mi)
06353 Montville (8.5 mi)
06382 Uncasville (8.6 mi)
06357 Niantic (9.4 mi)
06333 East Lyme (10.4 mi)
06370 Oakdale (10.9 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 29,672 |
| Population density | 1,316 / sq mi |
| State FIPS | 09 |
| County FIPS | 011 |
| Geography | |
|---|---|
| Land area | 22.54 sq mi |
| Water area | 4.72 sq mi |
| Latitude | 41.3580 |
| Longitude | -72.0385 |
| Timezone | Eastern (ET) |
| Area code | 860 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 40.2% | 32.0% | 32.0% |
| $50k – $100k | 34.5% | 30.8% | 27.7% |
| $100k – $200k | 18.8% | 28.0% | 27.1% |
| Over $200k | 6.4% | 9.2% | 13.2% |
Demographics & statistics
29,672
Population
1,316
People per sq mi
33.1
Median age
$76,138
Median household income
$43,058
Per capita income
$248,000
Median home value
$1,423
Median monthly rent
44.6%
Home ownership
9.7%
Poverty rate
5.7%
Unemployment
7,118
Housing units
35.0%
Bachelor's or higher
Age distribution
Male
Female
1,056
Under 5
877
781
5–9
649
811
10–14
674
1,050
15–19
872
1,584
20–24
1,315
3,316
25–34
2,754
1,521
35–44
1,264
1,634
45–54
1,358
973
55–59
809
847
60–64
703
1,403
65–74
1,166
640
75–84
531
592
85+
492
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 5,729 | 19.3% |
| 18 and over | 23,943 | 80.7% |
| 65 and over | 4,824 | 16.3% |
| Median age | 33.1 years | |
Race & ethnicity
White
69.5%
Two or more races
9.6%
Asian
6.7%
Black or African American
6.1%
Hispanic or Latino
5.4%
Other race
2.3%
American Indian / Alaska Native
0.4%
| Group | Count | % |
|---|---|---|
| White | 21,789 | 69.5% |
| Two or more races | 3,024 | 9.6% |
| Asian | 2,109 | 6.7% |
| Black or African American | 1,903 | 6.1% |
| Hispanic or Latino | 1,681 | 5.4% |
| Other race | 734 | 2.3% |
| American Indian / Alaska Native | 113 | 0.4% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 40.2% | 32.0% | 32.0% |
| $50k – $100k | 34.5% | 30.8% | 27.7% |
| $100k – $200k | 18.8% | 28.0% | 27.1% |
| Over $200k | 6.4% | 9.2% | 13.2% |
Under $10k
3.6%
$10k–$15k
3.1%
$15k–$25k
6.7%
$25k–$35k
7.3%
$35k–$50k
11.8%
$50k–$75k
16.1%
$75k–$100k
18.6%
$100k–$150k
15.7%
$150k–$200k
7.8%
$200k+
9.3%
| Range | % of households |
|---|---|
| Under $10k | 3.6% |
| $10k–$15k | 3.1% |
| $15k–$25k | 6.7% |
| $25k–$35k | 7.3% |
| $35k–$50k | 11.8% |
| $50k–$75k | 16.1% |
| $75k–$100k | 18.6% |
| $100k–$150k | 15.7% |
| $150k–$200k | 7.8% |
| $200k+ | 9.3% |
| Median income | $76,138 |
Housing
Home values
Under $50k
8.5%
$50k–$100k
3.2%
$100k–$150k
7.4%
$150k–$200k
17.3%
$200k–$300k
29.9%
$300k–$500k
17.7%
$500k–$1M
13.0%
$1M+
3.1%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $248,000 |
| Median rent / month | $1,423 |
| Owner occupied | 44.6% |
| Renter occupied | 55.4% |
| Vacant | 10.0% |
| Single-family detached | 38.3% |
| Large apartment buildings | 12.2% |
| Mobile homes | 3.7% |
| Median rooms | 5.0 |
| Avg household size (owned) | 2.21 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.1% |
| 2010–2019 | 3.6% |
| 2000–2009 | 8.2% |
| 1990–1999 | 12.0% |
| 1980–1989 | 14.1% |
| 1970–1979 | 21.8% |
| 1960–1969 | 10.9% |
| 1950–1959 | 12.8% |
| 1940–1949 | 4.1% |
| 1939 or earlier | 12.4% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 1.4% |
| 1 bedroom | 18.6% |
| 2 bedrooms | 38.3% |
| 3 bedrooms | 26.0% |
| 4 bedrooms | 12.0% |
| 5+ bedrooms | 3.7% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 8.4% |
| 1 vehicle | 44.3% |
| 2 vehicles | 35.1% |
| 3 or more | 12.3% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 10.7% |
| Electricity | 38.9% |
| Propane / LP gas | 5.2% |
| Fuel oil | 42.9% |
| Wood | 0.3% |
| Solar | 0.3% |
| No fuel used | 1.4% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 4,759 | 37.2% |
| Cohabiting couple | 880 | 6.9% |
| Male householder, no spouse | 3,593 | 28.1% |
| Female householder, no spouse | 3,548 | 27.8% |
| Households with children under 18 | 3,454 | 27.0% |
| Households with seniors (65+) | 3,323 | 26.0% |
| Average household size | 2.19 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 46.5% | 31.6% |
| Married | 40.7% | 44.3% |
| Separated | 0.6% | 1.2% |
| Widowed | 3.2% | 6.7% |
| Divorced | 9.1% | 16.2% |
Education
Less than 9th grade
3.4%
Some HS, no diploma
3.7%
HS graduate
26.9%
Some college, no degree
22.5%
Associate's degree
8.4%
Bachelor's degree
20.7%
Graduate / professional
14.3%
| Metric | % |
|---|---|
| HS diploma or higher | 92.9% |
| Bachelor's or higher | 35.0% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 565 | 9.4% |
| Kindergarten | 202 | 3.4% |
| Elementary school | 2,414 | 40.2% |
| High school | 1,300 | 21.6% |
| College / grad school | 1,524 | 25.4% |
Employment
Industry of employment
Education & healthcare
25.2%
Manufacturing
16.8%
Arts, food & hospitality
12.6%
Professional & management
11.6%
Retail trade
8.8%
Construction
5.2%
Public administration
5.1%
Other services
4.3%
Finance & real estate
4.1%
Transportation & utilities
3.2%
Wholesale trade
1.9%
Information
1.0%
Agriculture & mining
0.1%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 45.5% |
| Service | 19.4% |
| Sales & office | 19.5% |
| Natural resources & construction | 5.9% |
| Production & transportation | 9.6% |
Employment type
| Type | % |
|---|---|
| Private sector | 82.0% |
| Government | 13.6% |
| Self-employed | 4.2% |
| Unpaid family workers | 0.1% |
Commute
| Method | % |
|---|---|
| Drive alone | 72.2% |
| Carpool | 6.5% |
| Public transit | 1.6% |
| Walk | 7.1% |
| Work from home | 10.5% |
| Other means | 2.1% |
| Avg commute (minutes) | 17.8 |
Poverty
All people
9.7%
Under 18 years
14.8%
18 and over
8.5%
Married-couple families
1.9%
Female-led households
25.0%
Income support
| Source | % of households |
|---|---|
| Social Security | 26.2% |
| Retirement income | 23.7% |
| Supplemental Security | 4.0% |
| Cash public assistance | 5.1% |
| Food stamps / SNAP | 11.9% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 28.8% |
| High blood pressure | 26.0% |
| High cholesterol | 26.4% |
| Diabetes | 6.9% |
| Heart disease | 4.9% |
| Stroke | 2.2% |
| Asthma | 10.5% |
| Arthritis | 18.8% |
| Kidney disease | 2.2% |
| Pulmonary disease | 5.2% |
| Cancer | 5.5% |
| Behavior / access | % |
|---|---|
| Smoking | 15.8% |
| Binge drinking | 18.9% |
| No physical activity | 17.4% |
| Less than 7 hrs sleep | 34.3% |
| Depression | 21.3% |
| Fair or poor health | 10.2% |
| Poor mental health | 15.0% |
| Poor physical health | 7.8% |
| No health insurance | 10.5% |
| Visited doctor (checkup) | 74.3% |
| Visited dentist | 70.0% |
| Cholesterol screening | 87.1% |
| Teeth loss | 10.1% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 2,319 | 10.8% |
| Disability | % |
|---|---|
| Any disability | 13.1% |
| Under 18 | 3.3% |
| 18–64 years | 10.1% |
| 65 and over | 35.8% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 72.3% |
| Public insurance | 37.3% |
| No insurance | 3.8% |
| Uninsured under 19 | 1.4% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 27,739 | 93.5% |
| Spanish | 1,342 | 4.8% |
| Other Indo-European | 473 | 1.7% |
| Asian & Pacific Islander | 279 | 1.0% |
| Other languages | 590 | 2.1% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 26,882 | 90.6% |
| Born in same state | 26,521 | 89.4% |
| Born in different state | 12,631 | 42.6% |
| Foreign born | 361 | 1.2% |
| Naturalized citizen | 2,790 | 9.4% |
| Not a US citizen | 1,587 | 56.9% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 4,616 | 15.6% |
| French | 3,394 | 11.4% |
| Arab | 976 | 3.3% |
| German | 576 | 1.9% |
| Polish | 284 | 1% |
| Ancestry | Count | % |
|---|---|---|
| English | 119 | 0.4% |
| Dutch | 95 | 0.3% |
| Irish | 94 | 0.3% |
| Norwegian | 67 | 0.2% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 43.1% |
| Internet access | 92.9% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 06340
What city is ZIP code 06340 in?
ZIP code 06340 is primarily assigned to Groton, Connecticut.
What county is ZIP code 06340 in?
ZIP code 06340 falls within New London County, Connecticut.
Is ZIP code 06340 mostly rentals?
55% of occupied units in ZIP code 06340 are renter-occupied.
Does ZIP code 06340 have a large veteran population?
11% of civilians in ZIP code 06340 are veterans, above the national average of ~7%.
What is the population of ZIP code 06340?
ZIP code 06340 has an estimated population of 29,672 residents, with a density of 1,316 people per square mile.
What is the median household income in ZIP code 06340?
The median household income in ZIP code 06340 is $76,138, above the national median of ~$75,000.
What timezone is ZIP code 06340 in?
ZIP code 06340 observes the EST timezone.