🇺🇸 United States ZIP Code

STANDARD

06340

Groton

ZIP Code 06340 is a standard zip code serving Groton, Groton, Connecticut (CT), in Southeastern Connecticut County, United States. It has an estimated population of 31,242 with a median household income of $55,992. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Connecticut (CT)
County: Southeastern Connecticut
City: Groton
Timezone: America/New_York

Coordinates

Latitude: 41.357200
Longitude: -72.057900

Geographic Details

Land Area: 22.82 mi²
Water Area: 5.38 mi²
Population Density: 1369.0 people per mi² (80th percentile)
Bounding Box: 41.411598°N, 41.304096°S, -71.976847°E, -72.097221°W

With 31,242 residents spread across 22.82 square miles, this area has a population density of 1369.0 people per square mile.

Demographics

31,242

Population

90th percentile

$55,992

Median Income

65th percentile

$225,500

Median Home Value

75th percentile

22.82 mi²

Land Area

The median household income in 06340 is $55,992, and the median home value is $225,500.

Housing

14,010

Total Units

12,136

Occupied Units

86.6%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Groton, CT.

06349

Groton

Similar ZIP Codes in Connecticut

ZIP codes with similar median household income in Connecticut.

06081

Tariffville

$54,408

06382

Uncasville

$57,704

06515

New Haven

$51,611

06018

Canaan

$48,100

06901

Stamford

$59,118

06790

Torrington

$51,799

06757

Kent

$62,708

06062

Plainville

$60,630

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.