What city is 06820 in?

06820 is a Darien, CT mailing address. By land area, 18% lies inside Tokeneke, 14% lies inside Noroton, 7% lies inside Noroton Heights and 6% lies inside Darien Downtown; the rest is outside any Census-defined city or community.

What is the population of 06820?

About 21,936 people (±31), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 21,499.

What is the median household income in 06820?

$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 06820?

19 USPS carrier routes with 7,593 residential and 614 business mailboxes (8,217 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 06820?

The closest, measured center to center: 06906 (2.2 mi, Stamford), 06853 (2.3 mi, Norwalk), 06907 (2.7 mi, Stamford), 06854 (2.9 mi, Norwalk), 06901 (3.4 mi, Stamford) and 06905 (3.4 mi, Stamford).

06820 ZIP Code, Darien, CT

06820 is a ZIP code in Darien, Connecticut in Fairfield County. It covers 13 square miles of land. The closest ZIP codes are 06906, 06853 and 06907. 21,936 people live here in 7,234 households. At about 1,734 people per square mile it has suburban density, and most homes are owner-occupied (82%). Median household income is $250,000+, well above the Connecticut median of $95,781; 45% of households have children under 18.

Quick facts

Mailing city: Darien, CT
County: Fairfield County
Land area: 13 sq mi
Population: 21,936
Median household income: $250,000+
Carrier routes: 19 (7,593 homes)

Key figures

Measure	Value
Residents	21,936
Households	7,234
Median household income	$250,000+
Income per person	$152,454
Median age	40
Homeowners	82.4%
Median home value	$1,822,400
Median rent	$3,501
Bachelor's degree or higher	85.9%
Average commute (minutes)	38.6
Households with kids under 18	44.6%
Moved in the past year	11.3%
Below the poverty line	5.8%
Broadband internet	96.9%
Speak a non-English language at home	12.2%

Household income

% of households	Value
<$10K	2.6%
$10–15K	2.4%
$15–25K	1.8%
$25–35K	2.4%
$35–50K	2.1%
$50–75K	4.6%
$75–100K	3.1%
$100–150K	7.3%
$150–200K	7.1%
$200K+	66.6%

Age

% of all residents	Value
<10	15.9%
10–19	17.7%
20–24	5.1%
25–34	6.0%
35–44	14.2%
45–54	16.3%
55–64	11.3%
65–74	7.5%
75+	6.2%

Tenure

% of housing units	Value
Owned, with mortgage	53.8%
Owned outright	24.1%
Rented	16.4%
Vacant	5.7%

Type of building

% of housing units	Value
Detached house	85.1%
Townhome	2.6%
2–4 units	4.0%
5–19 units	5.8%
20+ units	2.5%
Mobile / other	0.0%

Businesses in 06820

709 business establishments with 6,576 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 111
Retail Trade: 90
Finance and Insurance: 83
Health Care and Social Assistance: 77
Accommodation and Food Services: 74
Other Services (except Public Administration): 74
Administrative and Support and Waste Management and Remediation Services: 41
Real Estate and Rental and Leasing: 31

EDDM carrier routes

06820 has 19 USPS carrier routes with 7,593 residential and 614 business mailboxes. Open the EDDM route map.

Carrier routes in 06820

06820 has 19 USPS carrier routes (19 city (C)) with 7,593 residential and 614 business mailboxes. Routes range from 216 homes (C027) to 552 homes (C008); the median route has 362 homes. The Census counted 7,234 households in 06820 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	1
250–499	14
500–749	4
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 06820 for…

Most businesses

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

Route C027 — USPS business mailboxes 210, 216 homes
Route C024 — USPS business mailboxes 115, 336 homes
Route C014 — USPS business mailboxes 101, 362 homes
Route C015 — USPS business mailboxes 55, 523 homes
Route C008 — USPS business mailboxes 49, 552 homes

Select these 5 routes on the route map

Every carrier route in 06820

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	348	0	$200,001+	—	—	—
C002	City	485	9	$127,077	—	—	—
C004	City	314	1	$200,001+	—	—	—
C005	City	356	5	$200,001+	—	—	—
C007	City	504	3	$127,077	—	—	—
C008	City	552	49	$200,001+	—	—	—
C012	City	316	1	$200,001+	—	—	—
C014	City	362	101	$200,001+	—	—	—
C015	City	523	55	$200,001+	—	—	—
C016	City	534	8	$200,001+	—	—	—
C017	City	420	6	$200,001+	—	—	—
C018	City	356	0	$200,001+	—	—	—
C019	City	308	1	$200,001+	—	—	—
C021	City	357	6	$200,001+	—	—	—
C023	City	400	4	$200,001+	—	—	—
C024	City	336	115	$200,001+	—	—	—
C026	City	447	3	$200,001+	—	—	—
C027	City	216	210	$200,001+	—	—	—
C029	City	459	37	$200,001+	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 06820 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

06906 — Stamford city, CT (2.2 mi)
06853 — Norwalk city, CT (2.3 mi)
06907 — Stamford city, CT (2.7 mi)
06854 — Norwalk city, CT (2.9 mi)
06901 — Stamford city, CT (3.4 mi)
06905 — Stamford city, CT (3.4 mi)
06902 — Stamford city, CT (3.5 mi)
06850 — Norwalk city, CT (4 mi)

Areas that include 06820

Noroton, CT ZIP codes — 1 ZIP code
Tokeneke, CT ZIP codes — 1 ZIP code
Noroton Heights, CT ZIP codes — 1 ZIP code
Darien Downtown, CT ZIP codes — 1 ZIP code
Darien, CT ZIP codes — 1 ZIP code
Fairfield County ZIP codes — 46 ZIP codes
Connecticut ZIP code data

Where it ranks

Mail every home in 06820

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) 06820, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 06820 in?: 06820 is a Darien, CT mailing address. By land area, 18% lies inside Tokeneke, 14% lies inside Noroton, 7% lies inside Noroton Heights and 6% lies inside Darien Downtown; the rest is outside any Census-defined city or community.
What county is 06820 in?: 06820 is in Fairfield County.
What is the population of 06820?: About 21,936 people (±31), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 21,499.
What is the median household income in 06820?: $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 06820?: 19 USPS carrier routes with 7,593 residential and 614 business mailboxes (8,217 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 06820?: The closest, measured center to center: 06906 (2.2 mi, Stamford), 06853 (2.3 mi, Norwalk), 06907 (2.7 mi, Stamford), 06854 (2.9 mi, Norwalk), 06901 (3.4 mi, Stamford) and 06905 (3.4 mi, Stamford).

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