What city is 06840 in?

06840 is a New Canaan, CT mailing address. By land area, 7% lies inside New Canaan; the rest is outside any Census-defined city or community.

What is the population of 06840?

About 20,870 people (±30), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 20,612.

What is the median household income in 06840?

$250,000+, 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 06840?

24 USPS carrier routes with 7,492 residential and 612 business mailboxes (8,125 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 06840?

The closest, measured center to center: 06850 (3.7 mi, Norwalk), 06903 (4.1 mi, Stamford), 06907 (4.2 mi, Stamford), 06897 (4.7 mi, Georgetown), 06851 (5.4 mi, Norwalk) and 06905 (5.5 mi, Stamford).

06840 ZIP Code, New Canaan, CT

06840 is a ZIP code in New Canaan, Connecticut in Fairfield County. It covers 22 square miles of land. The closest ZIP codes are 06850, 06903 and 06907. 20,870 people live here in 7,153 households. With about 941 people per square mile it is lightly settled, and most homes are owner-occupied (84%). Median household income is $250,000+, well above the Connecticut median of $95,781; 42% of households have children under 18.

Quick facts

Mailing city: New Canaan, CT
County: Fairfield County
Land area: 22 sq mi
Population: 20,870
Median household income: $250,000+
Carrier routes: 24 (7,492 homes)

Key figures

Measure	Value
Residents	20,870
Households	7,153
Median household income	$250,000+
Income per person	$143,695
Median age	42.1
Homeowners	83.7%
Median home value	$1,611,900
Median rent	$3,401
Bachelor's degree or higher	82.5%
Average commute (minutes)	38
Households with kids under 18	41.6%
Moved in the past year	11.8%
Below the poverty line	3.7%
Broadband internet	97.7%
Speak a non-English language at home	16.9%

Household income

% of households	Value
<$10K	1.4%
$10–15K	0.6%
$15–25K	1.0%
$25–35K	1.9%
$35–50K	4.1%
$50–75K	7.0%
$75–100K	5.7%
$100–150K	10.6%
$150–200K	8.2%
$200K+	59.5%

Age

% of all residents	Value
<10	13.4%
10–19	16.9%
20–24	4.7%
25–34	6.1%
35–44	13.4%
45–54	13.9%
55–64	16.2%
65–74	7.4%
75+	8.1%

Tenure

% of housing units	Value
Owned, with mortgage	52.7%
Owned outright	24.8%
Rented	14.9%
Vacant	7.6%

Type of building

% of housing units	Value
Detached house	73.1%
Townhome	11.2%
2–4 units	6.7%
5–19 units	5.2%
20+ units	4.0%
Mobile / other	0.0%

Businesses in 06840

665 business establishments with 5,691 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 111
Retail Trade: 72
Finance and Insurance: 67
Accommodation and Food Services: 67
Health Care and Social Assistance: 66
Other Services (except Public Administration): 65
Construction: 45
Real Estate and Rental and Leasing: 35

EDDM carrier routes

06840 has 24 USPS carrier routes with 7,492 residential and 612 business mailboxes. Open the EDDM route map.

Carrier routes in 06840

06840 has 24 USPS carrier routes (23 city (C), 1 rural (R)) with 7,492 residential and 612 business mailboxes. Routes range from 156 homes (C029) to 462 homes (C008); the median route has 314 homes. The Census counted 7,153 households in 06840 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	7
250–499	17
500–749	0
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 06840 for…

Most businesses

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

Route C003 — USPS business mailboxes 184, 221 homes
Route C011 — USPS business mailboxes 113, 286 homes
Route C001 — USPS business mailboxes 106, 427 homes
Route C016 — USPS business mailboxes 65, 455 homes
Route C029 — USPS business mailboxes 51, 156 homes

Select these 5 routes on the route map

Every carrier route in 06840

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	427	106	$176,122	—	—	—
C003	City	221	184	$176,122	—	—	—
C004	City	300	1	$200,001+	—	—	—
C005	City	362	0	$172,887	—	—	—
C006	City	330	0	$200,001+	—	—	—
C007	City	332	27	$176,122	—	—	—
C008	City	462	3	$200,001+	—	—	—
C009	City	248	1	$200,001+	—	—	—
C010	City	283	5	$200,001+	—	—	—
C011	City	286	113	$176,122	—	—	—
C012	City	230	0	$200,001+	—	—	—
C013	City	307	2	$200,001+	—	—	—
C014	City	206	0	$200,001+	—	—	—
C015	City	322	0	$200,001+	—	—	—
C016	City	455	65	$163,713	—	—	—
C018	City	397	4	$200,001+	—	—	—
C019	City	373	6	$200,001+	—	—	—
C021	City	321	0	$200,001+	—	—	—
C022	City	388	35	$139,191	—	—	—
C025	City	221	2	$176,122	—	—	—
C026	City	306	2	$200,001+	—	—	—
C027	City	211	2	$163,713	—	—	—
C029	City	156	51	$200,001+	—	—	—
R001	Rural	348	3	$200,001+	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 06840 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

06850 — Norwalk city, CT (3.7 mi)
06903 — Stamford city, CT (4.1 mi)
06907 — Stamford city, CT (4.2 mi)
06897 — Georgetown CDP, CT (4.7 mi)
06851 — Norwalk city, CT (5.4 mi)
06905 — Stamford city, CT (5.5 mi)
10576 — Scotts Corners CDP, NY (5.7 mi)
06820 — Tokeneke CDP, CT (5.9 mi)

Areas that include 06840

New Canaan, CT ZIP codes — 1 ZIP code
Fairfield County ZIP codes — 46 ZIP codes
Connecticut ZIP code data

Where it ranks

Mail every home in 06840

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) 06840, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 06840 in?: 06840 is a New Canaan, CT mailing address. By land area, 7% lies inside New Canaan; the rest is outside any Census-defined city or community.
What county is 06840 in?: 06840 is in Fairfield County.
What is the population of 06840?: About 20,870 people (±30), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 20,612.
What is the median household income in 06840?: $250,000+, 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 06840?: 24 USPS carrier routes with 7,492 residential and 612 business mailboxes (8,125 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 06840?: The closest, measured center to center: 06850 (3.7 mi, Norwalk), 06903 (4.1 mi, Stamford), 06907 (4.2 mi, Stamford), 06897 (4.7 mi, Georgetown), 06851 (5.4 mi, Norwalk) and 06905 (5.5 mi, Stamford).

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