06831 ZIP Code — Greenwich, CT

Fairfield County, Connecticut

ZIP code 06831 is located in Greenwich, Connecticut, within Fairfield County. It covers approximately 27.55 square miles and serves a population of 14,681 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 203/475.

About ZIP code 06831

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 $1,523,700. Owner-occupancy sits near the national average at 75%.

The gap between median ($215,797) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 4% is below the national average. 31% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 28 minutes is near the national average. Remote work is prevalent — 21% of workers work from home.

Educational attainment is high — 70% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 06831 reflects a community defined by a highly educated population, a high rate of remote workers, and a significant Social Security-dependent population.

14,681

population

27.55

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

06831 ZIP code map

Cities in ZIP code 06831

Below are the cities the US Postal Service accepts for ZIP code 06831. Using any city not on this list may result in mail delivery delays.

City	Status
Greenwich	Acceptable
Greenwich	Preferred

Nearby ZIP codes

06830 Greenwich (3.4 mi) 10504 Armonk (3.9 mi) 10604 West Harrison (4 mi) 10573 Port Chester (4 mi) 10577 Purchase (4.1 mi) 06807 Cos Cob (4.1 mi) 06878 Riverside (5.2 mi) 06870 Old Greenwich (5.9 mi) 06910 Stamford (5.9 mi) 06903 Stamford (6 mi) 10594 Thornwood (6.1 mi) 10603 White Plains (6.1 mi)

Demographics updated 05/2026

Population
Total population	14,681
Population density	533 / sq mi
State FIPS	09
County FIPS	001

Geography
Land area	27.55 sq mi
Water area	0.51 sq mi
Latitude	41.0805
Longitude	-73.6635
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	15.4%	27.3%	32.0%
$50k – $100k	12.9%	23.7%	27.7%
$100k – $200k	20.9%	26.8%	27.1%
Over $200k	50.7%	22.2%	13.2%

Demographics & statistics

14,681

Population

533

People per sq mi

47.6

Median age

$215,797

Median household income

$130,329

Per capita income

$1,523,700

Median home value

$2,422

Median monthly rent

74.8%

Home ownership

4.0%

Poverty rate

4.5%

Unemployment

4,613

Housing units

70.0%

Bachelor's or higher

Age distribution

Male Female

220

Under 5

238

346

5–9

375

527

10–14

573

425

15–19

462

283

20–24

307

672

25–34

729

785

35–44

852

1,042

45–54

1,131

585

55–59

636

691

60–64

750

863

65–74

937

446

75–84

484

154

85+

168

← Male

Female →

Age summary

Group	Count	%
Under 18	2,939	20.0%
18 and over	11,742	80.0%
65 and over	3,052	20.8%
Median age	47.6 years

Race & ethnicity

White 80.8%

Hispanic or Latino 5%

Black or African American 4.1%

Asian 4.1%

Two or more races 3.8%

Other race 2.1%

Group	Count	%
White	12,496	80.8%
Hispanic or Latino	780	5%
Black or African American	636	4.1%
Asian	628	4.1%
Two or more races	594	3.8%
Other race	327	2.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.4%	27.3%	32.0%
$50k – $100k	12.9%	23.7%	27.7%
$100k – $200k	20.9%	26.8%	27.1%
Over $200k	50.7%	22.2%	13.2%

Under $10k 3.0%

$10k–$15k 1.3%

$15k–$25k 2.3%

$25k–$35k 2.2%

$35k–$50k 5.3%

$50k–$75k 5.8%

$75k–$100k 6.7%

$100k–$150k 10.8%

$150k–$200k 9.3%

$200k+ 53.1%

Range	% of households
Under $10k	3.0%
$10k–$15k	1.3%
$15k–$25k	2.3%
$25k–$35k	2.2%
$35k–$50k	5.3%
$50k–$75k	5.8%
$75k–$100k	6.7%
$100k–$150k	10.8%
$150k–$200k	9.3%
$200k+	53.1%
Median income	$215,797

Housing

Home values

Under $50k 1.0%

$100k–$150k 1.8%

$150k–$200k 0.3%

$200k–$300k 0.6%

$300k–$500k 3.8%

$500k–$1M 26.4%

$1M+ 66.1%

Housing overview

Metric	Value
Median home value	$1,523,700
Median rent / month	$2,422
Owner occupied	74.8%
Renter occupied	25.2%
Vacant	12.3%
Single-family detached	78.4%
Large apartment buildings	2.2%
Mobile homes	0.0%
Median rooms	7.7
Avg household size (owned)	2.76

Year built

Era	%
2020 or later	0.2%
2010–2019	4.5%
2000–2009	10.5%
1990–1999	9.9%
1980–1989	10.5%
1970–1979	16.3%
1960–1969	14.3%
1950–1959	12.6%
1940–1949	4.7%
1939 or earlier	16.4%

Bedrooms

Size	% of units
No bedroom (studio)	2.3%
1 bedroom	7.8%
2 bedrooms	11.2%
3 bedrooms	29.1%
4 bedrooms	21.9%
5+ bedrooms	27.5%

Vehicles per household

Vehicles	% of households
No vehicle	3.0%
1 vehicle	18.9%
2 vehicles	45.4%
3 or more	32.7%

Heating fuel

Fuel type	%
Utility gas	49.6%
Electricity	9.2%
Propane / LP gas	7.4%
Fuel oil	32.9%
Solar	0.2%
No fuel used	0.1%

Households & families

Household type	Count	%
Married-couple family	3,688	71.0%
Cohabiting couple	89	1.7%
Male householder, no spouse	465	8.9%
Female householder, no spouse	955	18.4%
Households with children under 18	1,585	30.5%
Households with seniors (65+)	1,875	36.1%
Average household size	2.76

Marital status

Status	Male	Female
Never married	25.5%	25.3%
Married	67.9%	60.4%
Separated	0.2%	0.5%
Widowed	1.4%	8.3%
Divorced	4.9%	5.5%

Education

Less than 9th grade 1.2%

Some HS, no diploma 1.7%

HS graduate 12.8%

Some college, no degree 9.7%

Associate's degree 4.5%

Bachelor's degree 35.0%

Graduate / professional 35.1%

Metric	%
HS diploma or higher	97.1%
Bachelor's or higher	70.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	268	7.3%
Kindergarten	153	4.2%
Elementary school	1,553	42.3%
High school	739	20.1%
College / grad school	958	26.1%

Employment

Industry of employment

Education & healthcare 24.1%

Finance & real estate 19.2%

Professional & management 17.2%

Arts, food & hospitality 7.3%

Other services 6.2%

Retail trade 5.3%

Manufacturing 4.7%

Construction 3.4%

Public administration 3.4%

Transportation & utilities 2.9%

Wholesale trade 2.8%

Information 1.9%

Agriculture & mining 1.6%

Occupation

Category	%
Management, business & arts	63.4%
Service	11.5%
Sales & office	20.0%
Natural resources & construction	1.6%
Production & transportation	3.6%

Employment type

Type	%
Private sector	79.4%
Government	11.8%
Self-employed	7.8%
Unpaid family workers	1.0%

Commute

Method	%
Drive alone	60.7%
Carpool	4.6%
Public transit	9.7%
Walk	3.0%
Work from home	21.3%
Other means	0.7%
Avg commute (minutes)	28.0

Poverty

All people 4.0%

Under 18 years 2.2%

18 and over 4.5%

Married-couple families 1.4%

Female-led households 15.3%

Income support

Source	% of households
Social Security	31.0%
Retirement income	23.6%
Supplemental Security	1.6%
Cash public assistance	1.6%
Food stamps / SNAP	2.3%

Health indicators

Condition	%
Obesity	20.5%
High blood pressure	29.4%
High cholesterol	34.5%
Diabetes	7.3%
Heart disease	5.8%
Stroke	2.4%
Asthma	8.1%
Arthritis	22.8%
Kidney disease	2.6%
Pulmonary disease	4.5%
Cancer	8.7%

Behavior / access	%
Smoking	8.1%
Binge drinking	14.7%
No physical activity	14.1%
Less than 7 hrs sleep	27.6%
Depression	16.0%
Fair or poor health	8.2%
Poor mental health	10.4%
Poor physical health	7.4%
No health insurance	7.3%
Visited doctor (checkup)	77.0%
Visited dentist	79.1%
Cholesterol screening	95.1%
Teeth loss	6.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	383	3.3%

Disability	%
Any disability	5.7%
Under 18	0.9%
18–64 years	5.4%
65 and over	11.4%

Health insurance coverage

Type	%
Private insurance	88.9%
Public insurance	22.9%
No insurance	1.8%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	14,223	96.9%
Spanish	441	3.1%
Other Indo-European	132	0.9%
Asian & Pacific Islander	207	1.5%
Other languages	102	0.7%

Place of birth & citizenship

Origin	Count	%
Native born (US)	12,836	87.4%
Born in same state	12,469	84.9%
Born in different state	4,285	29.2%
Foreign born	367	2.5%
Naturalized citizen	1,845	12.6%
Not a US citizen	1,312	71.1%

Ancestry

Ancestry	Count	%
Italian	2,438	16.6%
French	1,917	13.1%
Arab	534	3.6%
English	203	1.4%
Dutch	202	1.4%

Ancestry	Count	%
Polish	139	0.9%
Norwegian	92	0.6%
German	83	0.6%
Irish	80	0.5%

Technology access

Metric	% of households
Computer access	35.4%
Internet access	98.5%

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

Frequently asked questions about ZIP code 06831

What city is ZIP code 06831 in?

ZIP code 06831 is primarily assigned to Greenwich, Connecticut.

What county is ZIP code 06831 in?

ZIP code 06831 falls within Fairfield County, Connecticut.

How educated is the population of ZIP code 06831?

70% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the median household income in ZIP code 06831?

The median household income in ZIP code 06831 is $215,797, above the national median of ~$75,000.

What is the typical home value in ZIP code 06831?

The median home value in ZIP code 06831 is $1,523,700.

What is the population of ZIP code 06831?

ZIP code 06831 has an estimated population of 14,681 residents, with a density of 533 people per square mile.

What timezone is ZIP code 06831 in?

ZIP code 06831 observes the EST timezone.