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US ZIP Code Profile

ZIP Code 06870
Old Greenwich, Connecticut

ZIP code 06870 is in Old Greenwich, located in Fairfield County, Connecticut, within the Bridgeport-Stamford-Norwalk metro area. Its 2020 Census population was 7,720. The estimated median adjusted gross income per tax return is $193,000, and about 49% of filers report $200,000 or more.

2020 Population
7,720
Census ZCTA
County
Fairfield
FIPS 09001
Median income (est.)
$193,000
IRS SOI 2022
Land Area
2.296 mi²
+ 1.483 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityOld Greenwich, CT
CountyFairfield County (FIPS 09001)
StateConnecticut (FIPS 09)
Metro Area (MSA)Bridgeport-Stamford-Norwalk, CT Metro Area (14860)
Census Region / DivisionNortheast Region · New England Division
Coordinates41.024445, -73.57115
Land / Water Area2.296 mi² land · 1.483 mi² water

02Income & Economics

Distribution of the 3,350 individual tax returns filed in 06870 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
17.0%
$25K–$50K
7.8%
$50K–$75K
6.0%
$75K–$100K
5.4%
$100K–$200K
14.9%
$200K+
49.0%
The $200,000+ bracket accounts for 96% of 06870's total adjusted gross income, from 49% of returns — a concentration that drives the gap between the median ($193,000) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 06870's IRS income metrics, 2020–2022.

Median income (2021→2022)
$193,000
▲ 4.7%
Filers earning $200K+
49.0%
▲ 1.2 pt
Total filers
3,350
▲ 0.6%
GET /zipc/v2/zipcodes/06870/soi?year=… $159K 2020 $184K 2021 $193K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 06870 ZCTA.

2000
7,092
 
2010
7,316
▲ +3.2%
2020
7,720
▲ +5.5%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 06870. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 06870

Old Greenwich and its immediate neighbors, sorted by distance.

3 mi
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Distance from 06870 to any ZIP

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06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortB
USPS Finance Number085542
City AliasesOld Greenwich

07Frequently Asked Questions

What county is ZIP code 06870 in?

ZIP code 06870 is in Fairfield County, Connecticut (county FIPS code 09001).

What city is ZIP code 06870?

The primary USPS city for 06870 is Old Greenwich, CT.

What metro area (MSA) is 06870 in?

06870 is part of the Bridgeport-Stamford-Norwalk, CT Metro Area (MSA code 14860).

What is the population of ZIP code 06870?

The 2020 Census population of 06870 was 7,720 residents.

What is the median income in ZIP code 06870?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 06870 is about $193,000, with around 49% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.