PlainZIP

Groton, CT · standard

ZIP Code 06340

New London County, Connecticut - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

31,242
527/sq mi
$81,792
Median income
$294,700
Median home value
39.2%
Bachelor's or higher

The verdict

Groton pairs an above-median household income with above-median home values, in a low-density, mixed-tenure area.

Top 36%
household income, US ZIPs
Top 34%
home value, US ZIPs
527
people per sq mi
45%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 06340 against every reporting US ZIP.

ZIP code 06340 is a densely settled ZIP (a standard USPS delivery area) in Groton, New London County, Connecticut, with 31,242 residents across 59.3 square miles, a density of 527 people per square mile, in the New York time zone.

ZIP 06340 lands in the middle-income range, with a median household income of $81,792 (28% below the Connecticut average), while per-capita income is $47,211. The poverty rate stands at 12.7% and the unemployment rate at 4.6%. The typical home here is valued at $294,700 (32% below the state average); renters pay a median of $1,599 monthly, and 44.5% of units are owner-occupied.

A solid share of residents have a four-year degree: 39.2% of adults hold a bachelor's degree or higher, the median age is 33.7, and the average commute is 18 minutes. A geography-based comparison follows: 10 ZIP codes within about 10 miles of 06340, plus 6 more within New London County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 06340

Top 5 sectors by establishment count in Groton, CT

Which industries have the most business establishments in ZIP 06340.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 06340, Groton, CT · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

31,242

Population

59.3

Area (sq mi)

527

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 06340?

33.7

Median Age

53.8%

Male

46.2%

Female

8.7%

Foreign-Born

White 69.8%
African American 6.2%
Asian 7.5%
American Indian or Alaska Native 0.6%
Native Hawaiian or Pacific Islander 0.1%
Two or More Ethnicities 13.4%
Hispanic or Latino 14.2%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$81,792

Median Household Income

-28% vs state

$47,211

Per Capita Income

12.7%

Poverty Rate

4.6%

Unemployment Rate

18.2 min

Mean Commute Time

How ZIP 06340 ranks nationally

Groton, CT household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$81,792 Top 36% higher than 64% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). This entry sits in this band. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 65.9%
Bachelor's Degree or Higher 39.2%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

14,359

Total Housing Units

12,879

Occupied Units

1,480

Vacant Units

2.19

Avg Household Size

Occupancy Type

Owner 44.5%
Renter 55.5%

$294,700

Median Home Value

-32% vs state

$1,599

Median Rent

1976

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+11.5%

YoY Change (2024)

249

HPI Index (2000 = 100)

+149%

Total Change Since 2000

Home values in ZIP 06340 have increased 11.5% over the past year (2024). Since 2000, this ZIP has seen +149% cumulative appreciation.

Year Annual Change HPI Index
2020 +4.4% 160
2021 +12.0% 179
2022 +14.7% 205
2023 +8.7% 223
2024 +11.5% 249

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 604 business establishments in ZIP 06340, employing approximately 22,442 people with a combined annual payroll of $2,096,855,000.

604

Businesses

22,442

Employees

$2.1B

Annual Payroll

15

Industry Sectors

Industry Establishments % of Total
Accommodation and food services 99 16.4%
Retail trade 96 15.9%
Other services (except public administration) 86 14.2%
Health care and social assistance 83 13.7%
Professional, scientific, and technical services 71 11.8%
Finance and insurance 33 5.5%
Real estate and rental and leasing 27 4.5%
Wholesale trade 22 3.6%
Administrative and support and waste management and remediation services 22 3.6%
Arts, entertainment, and recreation 18 3.0%
Construction 14 2.3%
Manufacturing 11 1.8%
Transportation and warehousing 10 1.7%
Information 7 1.2%
Educational services 4 0.7%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 06340 vs 06320 →

ZIP 06340 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 06340 ranks the most populous - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 06340 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 06340 ranks #9 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
06320 New London, CT 27,617 3.0 mi
06355 Mystic, CT 12,985 3.8 mi
06335 Gales Ferry, CT 6,729 5.2 mi
06385 Waterford, CT 15,893 5.7 mi
06375 Quaker Hill, CT 3,660 5.3 mi
06339 Ledyard, CT 8,302 6.6 mi
06390 Fishers Island, NY 236 6.7 mi
06378 Stonington, CT 5,399 7.0 mi
06382 Uncasville, CT 11,947 8.2 mi
06353 Montville, CT 162 8.6 mi

More ZIP Codes in New London County

06360 standard
Norwich, CT
Pop: 37,541
06320 standard
New London, CT
Pop: 27,617
06415 standard
Colchester, CT
Pop: 16,857
06351 standard
Jewett City, CT
Pop: 16,301
06385 standard
Waterford, CT
Pop: 15,893
06355 standard
Mystic, CT
Pop: 12,985

Related Areas

New London County Groton, CT Connecticut

Frequently Asked Questions

What county is ZIP code 06340 in? ▼
ZIP code 06340 (Groton) is located in New London County, Connecticut. New London County contains multiple ZIP codes, see the full list at /counties/new-london-ct.
What is the population of ZIP code 06340? ▼
ZIP code 06340 in Groton, CT has a population of 31,242 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 06340? ▼
The median household income in ZIP 06340 is $81,792, which is 7% above the national average of $76,288.
What is the average home value in ZIP 06340? ▼
The median home value in ZIP 06340 is $294,700, which is 6% above the national average of $278,155.
What is the demographic makeup of ZIP 06340? ▼
The largest racial group in ZIP 06340 is White at 69.8%. Hispanic or Latino residents make up 14.2% of the population.
How many businesses are in ZIP code 06340? ▼
ZIP code 06340 has 604 business establishments employing approximately 22,442 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 06340? ▼
The top industries by establishment count in ZIP 06340 are: Accommodation and food services (99), Retail trade (96), Other services (except public administration) (86). There are 15 industry sectors represented in total.
How have home values changed in ZIP code 06340? ▼
According to the FHFA House Price Index, home values in ZIP 06340 increased by 11.5% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 149%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 06340? ▼
In ZIP code 06340, 65.9% of residents aged 25+ have a high school diploma or higher, and 39.2% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 06340? ▼
The mean commute time for workers in ZIP code 06340 is 18.2 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 06340? ▼
In ZIP code 06340, approximately 44.5% of occupied housing units are owner-occupied and 55.5% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 06340? ▼
The poverty rate in ZIP code 06340 is 12.7% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.