06870 ZIP Code — Old Greenwich, CT

Fairfield County, Connecticut

ZIP code 06870 is located in Old Greenwich, Connecticut, within Fairfield County. It covers approximately 2.27 square miles and serves a population of 8,096 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 203/475.

About ZIP code 06870

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 $1,566,400. Owner-occupancy is high at 81%, well above the national average.

The gap between median ($215,000) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 3% 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 35 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 29% of workers work from home.

Educational attainment is high — 83% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 06870 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

8,096

population

2.27

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

06870 ZIP code map

Cities in ZIP code 06870

Below are the cities the US Postal Service accepts for ZIP code 06870. Using any city not on this list may result in mail delivery delays.

City	Status
Old Greenwich	Preferred

Nearby ZIP codes

06878 Riverside (0.7 mi) 06910 Stamford (1.3 mi) 06807 Cos Cob (2.1 mi) 06927 Stamford (2.1 mi) 06926 Stamford (2.1 mi) 06913 Stamford (2.1 mi) 06914 Stamford (2.1 mi) 06901 Stamford (2.2 mi) 06902 Stamford (2.3 mi) 06830 Greenwich (2.9 mi) 06906 Stamford (3.7 mi) 06905 Stamford (3.9 mi)

Demographics updated 05/2026

Population
Total population	8,096
Population density	3,567 / sq mi
State FIPS	09
County FIPS	001

Geography
Land area	2.27 sq mi
Water area	1.48 sq mi
Latitude	41.0332
Longitude	-73.5700
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	10.8%	27.3%	32.0%
$50k – $100k	11.7%	23.7%	27.7%
$100k – $200k	24.3%	26.8%	27.1%
Over $200k	53.2%	22.2%	13.2%

Demographics & statistics

8,096

Population

3,567

People per sq mi

40.5

Median age

$215,000

Median household income

$116,766

Per capita income

$1,566,400

Median home value

$3,501

Median monthly rent

80.8%

Home ownership

3.3%

Poverty rate

3.9%

Unemployment

2,349

Housing units

83.2%

Bachelor's or higher

Age distribution

Male Female

277

Under 5

305

482

5–9

530

324

10–14

356

252

15–19

278

184

20–24

202

25–34

695

35–44

765

558

45–54

614

312

55–59

343

157

60–64

173

306

65–74

336

142

75–84

157

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	2,642	32.6%
18 and over	5,454	67.4%
65 and over	1,125	13.9%
Median age	40.5 years

Race & ethnicity

White 76.9%

Asian 7.9%

Two or more races 7.7%

Hispanic or Latino 4%

Black or African American 2.3%

Other race 1.1%

Group	Count	%
White	6,485	76.9%
Asian	667	7.9%
Two or more races	651	7.7%
Hispanic or Latino	341	4%
Black or African American	196	2.3%
Other race	97	1.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	10.8%	27.3%	32.0%
$50k – $100k	11.7%	23.7%	27.7%
$100k – $200k	24.3%	26.8%	27.1%
Over $200k	53.2%	22.2%	13.2%

Under $10k 3.1%

$10k–$15k 0.9%

$15k–$25k 2.9%

$25k–$35k 2.1%

$35k–$50k 3.7%

$50k–$75k 3.8%

$75k–$100k 8.1%

$100k–$150k 13.5%

$150k–$200k 8.3%

$200k+ 53.5%

Range	% of households
Under $10k	3.1%
$10k–$15k	0.9%
$15k–$25k	2.9%
$25k–$35k	2.1%
$35k–$50k	3.7%
$50k–$75k	3.8%
$75k–$100k	8.1%
$100k–$150k	13.5%
$150k–$200k	8.3%
$200k+	53.5%
Median income	$215,000

Housing

Home values

Under $50k 1.1%

$50k–$100k 1.9%

$100k–$150k 0.5%

$200k–$300k 1.6%

$300k–$500k 6.0%

$500k–$1M 13.0%

$1M+ 75.9%

Housing overview

Metric	Value
Median home value	$1,566,400
Median rent / month	$3,501
Owner occupied	80.8%
Renter occupied	19.2%
Vacant	4.8%
Single-family detached	74.8%
Large apartment buildings	14.7%
Mobile homes	0.0%
Median rooms	7.9
Avg household size (owned)	2.99

Year built

Era	%
2020 or later	0.6%
2010–2019	6.3%
2000–2009	5.5%
1990–1999	12.1%
1980–1989	9.9%
1970–1979	12.5%
1960–1969	5.5%
1950–1959	15.4%
1940–1949	8.6%
1939 or earlier	23.7%

Bedrooms

Size	% of units
No bedroom (studio)	1.2%
1 bedroom	6.8%
2 bedrooms	11.6%
3 bedrooms	22.6%
4 bedrooms	32.5%
5+ bedrooms	25.3%

Vehicles per household

Vehicles	% of households
No vehicle	3.0%
1 vehicle	25.9%
2 vehicles	49.5%
3 or more	21.5%

Heating fuel

Fuel type	%
Utility gas	70.7%
Electricity	18.5%
Propane / LP gas	2.5%
Fuel oil	7.4%
Wood	0.3%
No fuel used	0.3%

Households & families

Household type	Count	%
Married-couple family	1,767	64.6%
Cohabiting couple	73	2.7%
Male householder, no spouse	351	12.8%
Female householder, no spouse	543	19.9%
Households with children under 18	1,252	45.8%
Households with seniors (65+)	809	29.6%
Average household size	2.96

Marital status

Status	Male	Female
Never married	23.5%	22.4%
Married	71.7%	58.8%
Separated	0.0%	0.0%
Widowed	0.9%	8.2%
Divorced	3.9%	10.5%

Education

Less than 9th grade 0.3%

Some HS, no diploma 1.4%

HS graduate 8.6%

Some college, no degree 4.1%

Associate's degree 2.3%

Bachelor's degree 38.7%

Graduate / professional 44.6%

Metric	%
HS diploma or higher	98.3%
Bachelor's or higher	83.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	334	12.5%
Kindergarten	262	9.8%
Elementary school	1,266	47.3%
High school	556	20.8%
College / grad school	259	9.7%

Employment

Industry of employment

Finance & real estate 27.0%

Professional & management 18.5%

Education & healthcare 13.4%

Arts, food & hospitality 9.4%

Information 7.2%

Retail trade 5.4%

Other services 4.4%

Manufacturing 4.3%

Wholesale trade 3.0%

Construction 2.8%

Transportation & utilities 2.3%

Public administration 1.9%

Agriculture & mining 0.3%

Occupation

Category	%
Management, business & arts	71.2%
Service	5.8%
Sales & office	19.0%
Natural resources & construction	1.8%
Production & transportation	2.2%

Employment type

Type	%
Private sector	81.9%
Government	5.4%
Self-employed	12.7%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	46.8%
Carpool	1.2%
Public transit	21.9%
Walk	0.5%
Work from home	29.3%
Other means	0.2%
Avg commute (minutes)	35.3

Poverty

All people 3.3%

Under 18 years 1.6%

18 and over 4.1%

Married-couple families 1.0%

Female-led households 11.2%

Income support

Source	% of households
Social Security	25.5%
Retirement income	20.1%
Supplemental Security	2.2%
Cash public assistance	0.0%
Food stamps / SNAP	1.6%

Health indicators

Condition	%
Obesity	20.3%
High blood pressure	25.8%
High cholesterol	32.4%
Diabetes	6.1%
Heart disease	4.6%
Stroke	1.9%
Asthma	8.1%
Arthritis	19.8%
Kidney disease	2.2%
Pulmonary disease	3.7%
Cancer	7.5%

Behavior / access	%
Smoking	7.6%
Binge drinking	16.1%
No physical activity	12.1%
Less than 7 hrs sleep	27.9%
Depression	16.2%
Fair or poor health	6.7%
Poor mental health	10.4%
Poor physical health	6.5%
No health insurance	6.1%
Visited doctor (checkup)	75.5%
Visited dentist	81.0%
Cholesterol screening	95.3%
Teeth loss	4.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	129	2.4%

Disability	%
Any disability	4.7%
Under 18	1.9%
18–64 years	3.0%
65 and over	17.9%

Health insurance coverage

Type	%
Private insurance	87.1%
Public insurance	19.5%
No insurance	2.1%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	7,514	92.8%
Spanish	225	3.0%
Other Indo-European	38	0.5%
Asian & Pacific Islander	47	0.6%
Other languages	140	1.9%

Place of birth & citizenship

Origin	Count	%
Native born (US)	6,611	81.7%
Born in same state	6,361	78.6%
Born in different state	2,944	36.4%
Foreign born	250	3.1%
Naturalized citizen	1,485	18.3%
Not a US citizen	616	41.5%

Ancestry

Ancestry	Count	%
Italian	1,222	15.1%
French	1,067	13.2%
Arab	349	4.3%
Norwegian	158	2%
Irish	147	1.8%

Ancestry	Count	%
Polish	102	1.3%
Dutch	77	1%
English	60	0.7%
German	41	0.5%

Technology access

Metric	% of households
Computer access	33.8%
Internet access	98.1%

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

Frequently asked questions about ZIP code 06870

What city is ZIP code 06870 in?

ZIP code 06870 is primarily assigned to Old Greenwich, Connecticut.

What county is ZIP code 06870 in?

ZIP code 06870 falls within Fairfield County, Connecticut.

How educated is the population of ZIP code 06870?

83% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 06870 family-oriented?

33% of residents in ZIP code 06870 are under 18, reflecting a younger, family-oriented community.

Is ZIP code 06870 mostly owner-occupied?

81% of occupied units in ZIP code 06870 are owner-occupied, well above the national average.

What is the median household income in ZIP code 06870?

The median household income in ZIP code 06870 is $215,000, above the national median of ~$75,000.

What timezone is ZIP code 06870 in?

ZIP code 06870 observes the EST timezone.