06820 ZIP Code — Darien, CT

Fairfield County, Connecticut

ZIP code 06820 is located in Darien, Connecticut, within Fairfield County. It covers approximately 12.65 square miles and serves a population of 21,571 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 203/475.

About ZIP code 06820

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $1,601,600. Owner-occupancy is high at 85%, well above the national average.

The gap between median ($250,001) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 5% is below the national average.

The dominant occupation class is management, business, and professional, with professional and management as the leading industry. An above-average commute of 39 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 29% of workers work from home.

Educational attainment is high — 85% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 06820 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

21,571

population

12.65

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

06820 ZIP code map

Cities in ZIP code 06820

Below are the cities the US Postal Service accepts for ZIP code 06820. Using any city not on this list may result in mail delivery delays.

City	Status
Darien	Acceptable
Darien	Preferred

Nearby ZIP codes

06906 Stamford (2.1 mi) 06853 Norwalk (2.3 mi) 06907 Stamford (2.4 mi) 06854 Norwalk (3.2 mi) 06905 Stamford (3.3 mi) 06901 Stamford (3.3 mi) 06926 Stamford (3.4 mi) 06927 Stamford (3.4 mi) 06913 Stamford (3.4 mi) 06914 Stamford (3.4 mi) 06902 Stamford (3.5 mi) 06850 Norwalk (4.1 mi)

Demographics updated 05/2026

Population
Total population	21,571
Population density	1,705 / sq mi
State FIPS	09
County FIPS	001

Geography
Land area	12.65 sq mi
Water area	2.18 sq mi
Latitude	41.0760
Longitude	-73.4816
Timezone	Eastern (ET)
Area code	203/475

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	10.1%	27.3%	32.0%
$50k – $100k	8.8%	23.7%	27.7%
$100k – $200k	20.1%	26.8%	27.1%
Over $200k	61.1%	22.2%	13.2%

Demographics & statistics

21,571

Population

1,705

People per sq mi

39.5

Median age

$250,001

Median household income

$147,195

Per capita income

$1,601,600

Median home value

$3,484

Median monthly rent

84.7%

Home ownership

5.4%

Poverty rate

5.0%

Unemployment

6,436

Housing units

85.1%

Bachelor's or higher

Age distribution

Male Female

709

Under 5

709

979

5–9

979

1,069

10–14

1,069

941

15–19

941

384

20–24

384

672

25–34

672

1,536

35–44

1,536

1,770

45–54

1,770

556

55–59

556

781

60–64

781

824

65–74

824

324

75–84

324

245

85+

245

← Male

Female →

Age summary

Group	Count	%
Under 18	6,786	31.5%
18 and over	14,785	68.5%
65 and over	2,785	12.9%
Median age	39.5 years

Race & ethnicity

White 79.4%

Asian 6.4%

Two or more races 6.4%

Hispanic or Latino 4.8%

Black or African American 1.5%

Other race 1.4%

American Indian / Alaska Native 0.1%

Group	Count	%
White	18,002	79.4%
Asian	1,452	6.4%
Two or more races	1,446	6.4%
Hispanic or Latino	1,088	4.8%
Black or African American	330	1.5%
Other race	324	1.4%
American Indian / Alaska Native	17	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	10.1%	27.3%	32.0%
$50k – $100k	8.8%	23.7%	27.7%
$100k – $200k	20.1%	26.8%	27.1%
Over $200k	61.1%	22.2%	13.2%

Under $10k 2.0%

$10k–$15k 2.9%

$15k–$25k 1.9%

$25k–$35k 1.9%

$35k–$50k 2.8%

$50k–$75k 3.3%

$75k–$100k 3.9%

$100k–$150k 8.9%

$150k–$200k 7.6%

$200k+ 64.8%

Range	% of households
Under $10k	2.0%
$10k–$15k	2.9%
$15k–$25k	1.9%
$25k–$35k	1.9%
$35k–$50k	2.8%
$50k–$75k	3.3%
$75k–$100k	3.9%
$100k–$150k	8.9%
$150k–$200k	7.6%
$200k+	64.8%
Median income	$250,001

Housing

Home values

Under $50k 1.1%

$50k–$100k 0.2%

$100k–$150k 0.6%

$200k–$300k 0.4%

$300k–$500k 0.5%

$500k–$1M 20.0%

$1M+ 77.0%

Housing overview

Metric	Value
Median home value	$1,601,600
Median rent / month	$3,484
Owner occupied	84.7%
Renter occupied	15.3%
Vacant	5.4%
Single-family detached	85.9%
Large apartment buildings	2.5%
Mobile homes	0.0%
Median rooms	8.4
Avg household size (owned)	3.19

Year built

Era	%
2020 or later	0.7%
2010–2019	8.7%
2000–2009	10.0%
1990–1999	4.6%
1980–1989	5.2%
1970–1979	6.0%
1960–1969	7.1%
1950–1959	18.4%
1940–1949	9.3%
1939 or earlier	30.0%

Bedrooms

Size	% of units
No bedroom (studio)	2.7%
1 bedroom	4.5%
2 bedrooms	8.0%
3 bedrooms	21.0%
4 bedrooms	35.2%
5+ bedrooms	28.5%

Vehicles per household

Vehicles	% of households
No vehicle	1.5%
1 vehicle	23.0%
2 vehicles	45.4%
3 or more	30.1%

Heating fuel

Fuel type	%
Utility gas	11.6%
Electricity	8.2%
Propane / LP gas	10.7%
Fuel oil	67.3%
No fuel used	0.2%

Households & families

Household type	Count	%
Married-couple family	5,162	72.5%
Cohabiting couple	57	0.8%
Male householder, no spouse	510	7.2%
Female householder, no spouse	1,387	19.5%
Households with children under 18	3,278	46.1%
Households with seniors (65+)	1,990	28.0%
Average household size	3.02

Marital status

Status	Male	Female
Never married	26.9%	22.7%
Married	68.7%	61.5%
Separated	0.2%	2.9%
Widowed	1.4%	6.2%
Divorced	2.8%	6.7%

Education

Less than 9th grade 1.3%

Some HS, no diploma 0.8%

HS graduate 4.3%

Some college, no degree 6.2%

Associate's degree 2.3%

Bachelor's degree 47.8%

Graduate / professional 37.3%

Metric	%
HS diploma or higher	97.9%
Bachelor's or higher	85.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	682	9.9%
Kindergarten	392	5.7%
Elementary school	3,273	47.6%
High school	1,744	25.4%
College / grad school	778	11.3%

Employment

Industry of employment

Finance & real estate 36.8%

Professional & management 18.0%

Education & healthcare 14.1%

Retail trade 7.6%

Arts, food & hospitality 4.1%

Manufacturing 3.4%

Construction 3.1%

Other services 3.1%

Information 2.9%

Public administration 2.7%

Wholesale trade 2.5%

Transportation & utilities 1.4%

Agriculture & mining 0.2%

Occupation

Category	%
Management, business & arts	65.2%
Service	5.0%
Sales & office	25.9%
Natural resources & construction	2.7%
Production & transportation	1.2%

Employment type

Type	%
Private sector	87.1%
Government	5.0%
Self-employed	7.8%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	39.1%
Carpool	5.1%
Public transit	23.0%
Walk	2.1%
Work from home	29.4%
Other means	1.3%
Avg commute (minutes)	39.3

Poverty

All people 5.4%

Under 18 years 5.5%

18 and over 5.4%

Married-couple families 1.8%

Female-led households 15.1%

Income support

Source	% of households
Social Security	22.9%
Retirement income	21.7%
Supplemental Security	1.6%
Cash public assistance	0.7%
Food stamps / SNAP	0.7%

Health indicators

Condition	%
Obesity	20.2%
High blood pressure	25.0%
High cholesterol	31.3%
Diabetes	5.8%
Heart disease	4.3%
Stroke	1.8%
Asthma	8.1%
Arthritis	19.0%
Kidney disease	2.1%
Pulmonary disease	3.5%
Cancer	7.3%

Behavior / access	%
Smoking	7.3%
Binge drinking	16.7%
No physical activity	11.4%
Less than 7 hrs sleep	27.4%
Depression	16.3%
Fair or poor health	6.4%
Poor mental health	10.4%
Poor physical health	6.3%
No health insurance	5.8%
Visited doctor (checkup)	75.0%
Visited dentist	81.6%
Cholesterol screening	95.2%
Teeth loss	4.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	612	4.1%

Disability	%
Any disability	4.2%
Under 18	1.3%
18–64 years	2.1%
65 and over	20.2%

Health insurance coverage

Type	%
Private insurance	90.2%
Public insurance	16.6%
No insurance	1.7%
Uninsured under 19	2.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	20,154	93.4%
Spanish	534	2.6%
Other Indo-European	111	0.6%
Asian & Pacific Islander	164	0.8%
Other languages	252	1.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	19,113	88.6%
Born in same state	18,463	85.6%
Born in different state	7,194	33.4%
Foreign born	650	3.0%
Naturalized citizen	2,458	11.4%
Not a US citizen	1,529	62.2%

Ancestry

Ancestry	Count	%
Italian	5,046	23.4%
French	3,573	16.6%
Arab	1,445	6.7%
Irish	444	2.1%
English	320	1.5%

Ancestry	Count	%
Polish	216	1%
German	134	0.6%
Norwegian	109	0.5%
Dutch	71	0.3%

Technology access

Metric	% of households
Computer access	33.0%
Internet access	98.0%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 06820

What city is ZIP code 06820 in?

ZIP code 06820 is primarily assigned to Darien, Connecticut.

What county is ZIP code 06820 in?

ZIP code 06820 falls within Fairfield County, Connecticut.

How educated is the population of ZIP code 06820?

85% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 06820 family-oriented?

32% of residents in ZIP code 06820 are under 18, reflecting a younger, family-oriented community.

Is ZIP code 06820 mostly owner-occupied?

85% of occupied units in ZIP code 06820 are owner-occupied, well above the national average.

What is the median household income in ZIP code 06820?

The median household income in ZIP code 06820 is $250,001, above the national median of ~$75,000.

What timezone is ZIP code 06820 in?

ZIP code 06820 observes the EST timezone.