Get API Key →
US ZIP Code Profile

ZIP Code 06820
Darien, Connecticut

ZIP code 06820 is in Darien, located in Fairfield County, Connecticut, within the Bridgeport-Stamford-Norwalk metro area. Its 2020 Census population was 21,499. The estimated median adjusted gross income per tax return is $200,000, and about 51% of filers report $200,000 or more.

2020 Population
21,499
Census ZCTA
County
Fairfield
FIPS 09001
Median income (est.)
$200,000
IRS SOI 2022
Land Area
12.654 mi²
+ 2.317 mi² water

01Location & Geography

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

Primary CityDarien, 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
Coordinates41.076202, -73.48008
Land / Water Area12.654 mi² land · 2.317 mi² water

02Income & Economics

Distribution of the 9,540 individual tax returns filed in 06820 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
19.3%
$25K–$50K
7.0%
$50K–$75K
5.8%
$75K–$100K
5.0%
$100K–$200K
11.7%
$200K+
51.1%
The $200,000+ bracket accounts for 96% of 06820's total adjusted gross income, from 51% of returns — a concentration that drives the gap between the median ($200,000) 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 06820's IRS income metrics, 2020–2022.

Median income (2021→2022)
$200,000
▲ 0.2%
Filers earning $200K+
51.1%
▲ 1.2 pt
Total filers
9,540
▲ 0.3%
GET /zipc/v2/zipcodes/06820/soi?year=… $169K 2020 $200K 2021 $200K 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 06820 ZCTA.

2000
19,607
 
2010
20,732
▲ +5.7%
2020
21,499
▲ +3.7%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 06820. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 06820

Darien and its immediate neighbors, sorted by distance.

3 mi
GET /zipc/v2/distance

Distance from 06820 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortB
USPS Finance Number081734
City AliasesDarien, Noroton, Noroton Heights, Tokeneke

07Frequently Asked Questions

What county is ZIP code 06820 in?

ZIP code 06820 is in Fairfield County, Connecticut (county FIPS code 09001).

What city is ZIP code 06820?

The primary USPS city for 06820 is Darien, CT.

What metro area (MSA) is 06820 in?

06820 is part of the Bridgeport-Stamford-Norwalk, CT Metro Area (MSA code 14860).

What is the population of ZIP code 06820?

The 2020 Census population of 06820 was 21,499 residents.

What is the median income in ZIP code 06820?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 06820 is about $200,000, with around 51% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.