PlainZIP

Old Greenwich, CT · standard

ZIP Code 06870

Fairfield County, Connecticut - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

7,316
1,231/sq mi
$250,001
Median income
$1,788,700
Median home value
85.4%
Bachelor's or higher

The verdict

Old Greenwich pairs a top-decile household income with top-decile home values, in a low-density, homeowner-dominated area.

Top 1%
household income, US ZIPs
Top 1%
home value, US ZIPs
1,231
people per sq mi
84%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 06870 against every reporting US ZIP.

ZIP code 06870 is a mid-sized community (a standard USPS delivery area) in Old Greenwich, Fairfield County, Connecticut, home to 7,316 residents across 5.9 square miles, a density of 1,231 people per square mile, in the New York time zone.

ZIP 06870 skews affluent, with a median household income of $250,001 (121% above the Connecticut average), while per-capita income is $144,459. The poverty rate stands at 3.4% and the unemployment rate at 4.1%. Housing costs here run $1,788,700 for a typical home value (312% above the state average), with rent averaging $3,501 a month; 83.9% of homes are owner-occupied.

This is a highly-educated ZIP: 85.4% of adults hold a bachelor's degree or higher, the median age is 40, and the average commute is 33 minutes. A geography-based comparison follows: 10 ZIP codes within about 10 miles of 06870, plus 6 more within Fairfield County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 06870

Top 5 sectors by establishment count in Old Greenwich, CT

Which industries have the most business establishments in ZIP 06870.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 06870, Old Greenwich, CT · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

7,316

Population

5.9

Area (sq mi)

1,231

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 06870?

40.0

Median Age

51.2%

Male

48.8%

Female

20.2%

Foreign-Born

White 76.0%
African American 0.9%
Asian 10.4%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 11.5%
Hispanic or Latino 7.2%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$250,001

Median Household Income

+121% vs state

$144,459

Per Capita Income

3.4%

Poverty Rate

4.1%

Unemployment Rate

32.8 min

Mean Commute Time

How ZIP 06870 ranks nationally

Old Greenwich, CT household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$250,001 Top 1% higher than 99% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). Below this entry. $160,000–$180,000: 364 US ZIPs (1%). Below this entry. $180,000–$200,000: 186 US ZIPs (1%). Below this entry. $200,000–$220,000: 324 US ZIPs (1%). This entry sits in this band. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 91.9%
Bachelor's Degree or Higher 85.4%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

2,922

Total Housing Units

2,756

Occupied Units

166

Vacant Units

2.85

Avg Household Size

Occupancy Type

Owner 83.9%
Renter 16.1%

$1,788,700

Median Home Value

+312% vs state

$3,501

Median Rent

1968

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+3.4%

YoY Change (2023)

212

HPI Index (2000 = 100)

+112%

Total Change Since 2000

Home values in ZIP 06870 have increased 3.4% over the past year (2023). Since 2000, this ZIP has seen +112% cumulative appreciation.

Year Annual Change HPI Index
2018 -6.3% 171
2019 +9.8% 187
2020 +0.4% 188
2021 +3.4% 195
2023 – 212

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2023. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 242 business establishments in ZIP 06870, employing approximately 2,476 people with a combined annual payroll of $448,441,000.

242

Businesses

2,476

Employees

$448.4M

Annual Payroll

14

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 43 17.8%
Health care and social assistance 28 11.6%
Finance and insurance 27 11.2%
Retail trade 25 10.3%
Other services (except public administration) 24 9.9%
Accommodation and food services 23 9.5%
Construction 14 5.8%
Arts, entertainment, and recreation 14 5.8%
Wholesale trade 12 5.0%
Real estate and rental and leasing 8 3.3%
Administrative and support and waste management and remediation services 8 3.3%
Educational services 6 2.5%
Manufacturing 5 2.1%
Information 3 1.2%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 06870 vs 06878 →

ZIP 06870 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 06870 ranks #9 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 06870 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 06870 ranks the highest of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
06878 Riverside, CT 8,043 0.7 mi
06902 Stamford, CT 63,406 2.4 mi
06807 Cos Cob, CT 7,150 2.5 mi
06901 Stamford, CT 6,828 2.4 mi
06830 Greenwich, CT 24,027 3.1 mi
06905 Stamford, CT 19,649 4.3 mi
06906 Stamford, CT 9,088 3.8 mi
06903 Stamford, CT 14,499 7.4 mi
10573 Port Chester, NY 38,352 5.7 mi
06907 Stamford, CT 9,016 5.6 mi

More ZIP Codes in Fairfield County

06902 standard
Stamford, CT
Pop: 63,406
06810 standard
Danbury, CT
Pop: 49,482
06606 standard
Bridgeport, CT
Pop: 46,236
06484 standard
Shelton, CT
Pop: 39,559
06611 standard
Trumbull, CT
Pop: 36,091
06824 standard
Fairfield, CT
Pop: 33,900

Related Areas

Fairfield County Old Greenwich, CT Connecticut

Frequently Asked Questions

What county is ZIP code 06870 in? ▼
ZIP code 06870 (Old Greenwich) is located in Fairfield County, Connecticut. Fairfield County contains multiple ZIP codes, see the full list at /counties/fairfield-ct.
What is the population of ZIP code 06870? ▼
ZIP code 06870 in Old Greenwich, CT has a population of 7,316 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 06870? ▼
The median household income in ZIP 06870 is $250,001, which is 228% above the national average of $76,288.
What is the average home value in ZIP 06870? ▼
The median home value in ZIP 06870 is $1,788,700, which is 543% above the national average of $278,155.
What is the demographic makeup of ZIP 06870? ▼
The largest racial group in ZIP 06870 is White at 76.0%. Hispanic or Latino residents make up 7.2% of the population.
How many businesses are in ZIP code 06870? ▼
ZIP code 06870 has 242 business establishments employing approximately 2,476 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 06870? ▼
The top industries by establishment count in ZIP 06870 are: Professional, scientific, and technical services (43), Health care and social assistance (28), Finance and insurance (27). There are 14 industry sectors represented in total.
How have home values changed in ZIP code 06870? ▼
According to the FHFA House Price Index, home values in ZIP 06870 increased by 3.4% in 2023. Since 2000, home values in this ZIP have appreciated by approximately 112%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 06870? ▼
In ZIP code 06870, 91.9% of residents aged 25+ have a high school diploma or higher, and 85.4% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 06870? ▼
The mean commute time for workers in ZIP code 06870 is 32.8 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend more time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 06870? ▼
In ZIP code 06870, approximately 83.9% of occupied housing units are owner-occupied and 16.1% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 06870? ▼
The poverty rate in ZIP code 06870 is 3.4% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.