What city is 06340 in?

06340 is a Groton, CT mailing address. By land area, 23% lies inside Conning Towers-Nautilus Park, 14% lies inside Groton, 7% lies inside Long Hill and 6% lies inside Poquonock Bridge; the rest is outside any Census-defined city or community.

What is the population of 06340?

About 29,863 people (±671), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 29,788.

What is the median household income in 06340?

$81,792 (±$3,662), compared with $95,781 for Connecticut as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 06340?

21 USPS carrier routes with 13,177 residential and 623 business mailboxes (13,893 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 06340?

The closest, measured center to center: 06320 (3.2 mi, New London), 06355 (3.6 mi, Old Mystic), 06335 (5.6 mi, Gales Ferry), 06375 (5.6 mi), 06385 (6.1 mi, Waterford) and 06339 (6.6 mi, Mashantucket).

06340 ZIP Code, Groton, CT

06340 is a ZIP code in Groton, Connecticut in New London County. It covers 23 square miles of land. The closest ZIP codes are 06320, 06355 and 06335. 29,863 people live here in 12,879 households. At about 1,325 people per square mile it has suburban density, and owners and renters are mixed (45% own). Median household income is $81,792, below the Connecticut median of $95,781; 23% of residents moved in during the past year.

Quick facts

Mailing city: Groton, CT
County: New London County
Land area: 23 sq mi
Population: 29,863
Median household income: $81,792
Carrier routes: 21 (13,177 homes)

Key figures

Measure	Value
Residents	29,863
Households	12,879
Median household income	$81,792
Income per person	$47,211
Median age	33.7
Homeowners	44.5%
Median home value	$294,700
Median rent	$1,599
Bachelor's degree or higher	39.2%
Average commute (minutes)	18.2
Households with kids under 18	26.5%
Moved in the past year	22.9%
Below the poverty line	12.7%
Broadband internet	89.7%
Speak a non-English language at home	12.3%

Household income

% of households	Value
<$10K	5.8%
$10–15K	2.3%
$15–25K	5.9%
$25–35K	6.7%
$35–50K	9.8%
$50–75K	14.1%
$75–100K	19.5%
$100–150K	15.8%
$150–200K	8.6%
$200K+	11.6%

Age

% of all residents	Value
<10	11.3%
10–19	10.1%
20–24	11.1%
25–34	19.6%
35–44	10.5%
45–54	8.9%
55–64	11.8%
65–74	8.9%
75+	7.9%

Tenure

% of housing units	Value
Owned, with mortgage	23.8%
Owned outright	16.3%
Rented	49.6%
Vacant	10.3%

Type of building

% of housing units	Value
Detached house	37.9%
Townhome	13.3%
2–4 units	17.7%
5–19 units	14.9%
20+ units	13.6%
Mobile / other	2.6%

Businesses in 06340

604 business establishments with 22,442 employees (ZIP Codes Business Patterns 2023).

Accommodation and Food Services: 99
Retail Trade: 96
Other Services (except Public Administration): 86
Health Care and Social Assistance: 83
Professional, Scientific, and Technical Services: 71
Finance and Insurance: 33
Real Estate and Rental and Leasing: 27
Wholesale Trade: 22

EDDM carrier routes

06340 has 21 USPS carrier routes with 13,177 residential and 623 business mailboxes. Open the EDDM route map.

Carrier routes in 06340

06340 has 21 USPS carrier routes (18 city (C), 3 rural (R)) with 13,177 residential and 623 business mailboxes. Routes range from 280 homes (C013) to 1,082 homes (C012); the median route has 561 homes. The Census counted 12,879 households in 06340 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	4
500–749	11
750–999	4
1,000–1,499	2
1,500+	0

Best routes in 06340 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C012 — USPS business mailboxes 65, 1,082 homes
Route C022 — USPS business mailboxes 63, 529 homes
Route C025 — USPS business mailboxes 61, 370 homes
Route C019 — USPS business mailboxes 57, 741 homes
Route C024 — USPS business mailboxes 57, 528 homes

Select these 5 routes on the route map

Every carrier route in 06340

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C002	City	663	48	$54,131	—	—	—
C003	City	405	8	$114,924	—	—	—
C004	City	754	9	$77,891	—	—	—
C005	City	512	15	$114,924	—	—	—
C006	City	1,002	56	$80,794	—	—	—
C007	City	916	1	$54,131	—	—	—
C010	City	568	15	$148,848	—	—	—
C012	City	1,082	65	$61,633	—	—	—
C013	City	280	18	$157,997	—	—	—
C015	City	803	2	$64,366	—	—	—
C017	City	522	17	$69,054	—	—	—
C019	City	741	57	$28,683	—	—	—
C021	City	867	54	$57,425	—	—	—
C022	City	529	63	$77,891	—	—	—
C023	City	561	3	$53,943	—	—	—
C024	City	528	57	$69,054	—	—	—
C025	City	370	61	$53,943	—	—	—
C026	City	528	4	$53,943	—	—	—
R001	Rural	508	45	$77,891	—	—	—
R002	Rural	653	12	$81,430	—	—	—
R003	Rural	385	13	$66,380	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 06340 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

06320 — New London city, CT (3.2 mi)
06355 — Old Mystic CDP, CT (3.6 mi)
06335 — Gales Ferry CDP, CT (5.6 mi)
06375 (5.6 mi)
06385 — Waterford CDP, CT (6.1 mi)
06339 — Mashantucket CDP, CT (6.6 mi)
06378 — Mystic CDP, CT (7.1 mi)
06390 — Fishers Island CDP, NY (7.1 mi)

Areas that include 06340

Groton, CT ZIP codes — 1 ZIP code
Conning Towers-Nautilus Park, CT ZIP codes — 1 ZIP code
Long Hill (New London County), CT ZIP codes — 1 ZIP code
Noank, CT ZIP codes — 2 ZIP codes
Poquonock Bridge, CT ZIP codes — 1 ZIP code
Groton Long Point, CT ZIP codes — 1 ZIP code
New London County ZIP codes — 33 ZIP codes
Connecticut ZIP code data

Where it ranks

Mail every home in 06340

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 06340, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 06340 in?: 06340 is a Groton, CT mailing address. By land area, 23% lies inside Conning Towers-Nautilus Park, 14% lies inside Groton, 7% lies inside Long Hill and 6% lies inside Poquonock Bridge; the rest is outside any Census-defined city or community.
What county is 06340 in?: 06340 is in New London County.
What is the population of 06340?: About 29,863 people (±671), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 29,788.
What is the median household income in 06340?: $81,792 (±$3,662), compared with $95,781 for Connecticut as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 06340?: 21 USPS carrier routes with 13,177 residential and 623 business mailboxes (13,893 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 06340?: The closest, measured center to center: 06320 (3.2 mi, New London), 06355 (3.6 mi, Old Mystic), 06335 (5.6 mi, Gales Ferry), 06375 (5.6 mi), 06385 (6.1 mi, Waterford) and 06339 (6.6 mi, Mashantucket).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.