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 High-density area
- $81,792
- Median income Near-median income area
- $294,700
- Median home value Near-median home value
- 39.2%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 06340 (Groton, CT) rose +11.5% from 2023 to 2024. The all-transactions index moved from 222.9 in 2023 to 248.6 in 2024 (2000 = 100).
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 average Connecticut ZIP), while per-capita income is $47,211. The poverty rate is 12.7%, with unemployment at 4.6%; those measures add context to the income figure. Home values sit below the statewide ZIP benchmark: the median is $294,700 (32% below the average Connecticut ZIP), and median rent is $1,599; owner occupancy is 44.5%.
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. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in New London County, so 06340 can be compared with both its immediate and county-level context.
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.
- Accommodation and food services
Accommodation and food services
99 establishments
- Retail trade
Retail trade
96 establishments
- Other services (except public administration)
Other services (except public administration)
86 establishments
- Health care and social assistance
Health care and social assistance
83 establishments
- Professional, scientific, and technical services
Professional, scientific, and technical services
71 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, 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
Who lives in ZIP 06340?
33.7
Median Age
53.8%
Male
46.2%
Female
8.7%
Foreign-Born
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 ZIP avg
$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
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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
14,359housing units
14,359
Total Housing Units
12,879
Occupied Units
1,480
Vacant Units
2.19
Avg Household Size
Occupancy Type
$294,700
Median Home Value
-32% vs state ZIP avg
$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.
- 06340
Groton (06340)
31,242 residents
- 06320
New London (06320)
27,617 residents
- 06385
Waterford (06385)
15,893 residents
- 06355
Mystic (06355)
12,985 residents
- 06382 11,947
Uncasville (06382)
11,947 residents
- 06339 8,302
Ledyard (06339)
8,302 residents
- 06335 6,729
Gales Ferry (06335)
6,729 residents
- 06378 5,399
Stonington (06378)
5,399 residents
- 06375 3,660
Quaker Hill (06375)
3,660 residents
What this shows Among its immediate neighbors, ZIP 06340 ranks the most populous - useful context the national average alone can't give.
ZIP 06340 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 06355
Mystic (06355)
$137,425 median income
- 06378
Stonington (06378)
$135,714 median income
- 06335
Gales Ferry (06335)
$118,116 median income
- 06375
Quaker Hill (06375)
$111,833 median income
- 06339
Ledyard (06339)
$106,403 median income
- 06385
Waterford (06385)
$100,484 median income
- 06390
Fishers Island (06390)
$98,125 median income
- 06382
Uncasville (06382)
$89,635 median income
- 06340
Groton (06340)
$81,792 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 06340, both outside CT so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (31,242 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in New London County
Related Areas
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.
Related
Take this with you
What to do with ZIP 06340's numbers, next.
- See how ZIP 06340 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Groton, CT ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.