Residential delivery area · Connecticut
ZIP Code 06820: Darien, CT
ZIP code 06820 uses the postal name Darien, Connecticut and lies entirely in Fairfield County (Census 2020 ZIP-county file). About 22,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $250,000 or more (Census Bureau, ACS 2020-2024). By Census place, its land lies in Tokeneke (19%), Noroton (14%), Noroton Heights (7%) and Darien Downtown (6%); 54% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Darien · its only residential ZIP
- County
- Fairfield County
- Census places
- Tokeneke (19%) census-designated place; Noroton (14%) census-designated place; Noroton Heights (7%) census-designated place; Darien Downtown (6%) census-designated place
- House district
- CT-4 119th Congress
- State
- Connecticut
- Time zone
- Eastern
- Land area
- 12.7 sq mi · 1,734 people per sq mi
Where is ZIP code 06820?
06820 centers on 41.076°, -73.480° and covers 12.7 square miles of land plus 2.2 of water. It borders 7 ZIP codes: 06906, 06853, 06907, 06854, 06902, 06850, 06840.
The map draws ZIP code areas only. For the streets inside 06820, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 06820 compare with the rest of Fairfield County?
| Measure | 06820 | In Fairfield County | In CT |
|---|---|---|---|
| People (ACS 2020-2024) | 21,936 | 18th of 46 | 59th of 288 |
| Median household income | $250k+ | 1= of 45 | 1= of 228 |
| Median home value | $1.82M | 2nd of 46 | 2nd of 245 |
1= means a shared first place: 06820's median household income ties with 6 other ZIP codes at the Census cap in Fairfield County; median household income ties with 6 other ZIP codes at the Census cap in Connecticut.
Its median household income is at the Census cap of $250,000 or more, like 117 other U.S. residential ZIP codes (69 of the 118 are large enough to rank), and it is denser than 83% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 06820?
The 2020 Census counted 21,499 people in 06820; the ACS, which samples households over 2020-2024, estimates 21,936. Between the 2010 and 2020 censuses its population grew 3.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 21,936
- 2020 Census count
- 21,499+3.7% since 2010 (20,732)
- Households
- 7,234
- Median age
- 40.0
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 06820?
Of the 21,936 people the ACS estimates in 06820, 30.9% are under 18 and 13.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (80.7%).
- Under 1830.9%
- 18 to 6455.4%
- 65 and older13.7%
- White, not Hispanic80.7%
- Asian, not Hispanic7.4%
- Hispanic or Latino5.8%
- Other or two or more5.6%
- Black, not Hispanic0.5%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 06820 earn?
Median household income is $250,000 or more (ACS 2020-2024), the highest of the 45 ranked ZIP codes in Fairfield County.
By IRS adjusted gross income per tax return ($709,736, 2022), 06820 ranks 37th in the U.S. among ZIP codes of 1,000+ people with 200+ returns and at most 1.5 returns per household (see the ranking).
- Median household income
- $250,000 or more
- Income per person
- $152,454
- Below the poverty line
- 5.8%
- Unemployed (of the labor force)
- 5.1%
- Adults 25+ with a bachelor's degree
- 85.9%
- Adjusted gross income per tax return, 2022
- $709,7369,540 returns; wages 52% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 06820?
FHFA's house price index for 06820, built from repeat sales and appraisals of the same homes, rose 62% from 2015 to 2025 and rose 68% from 2020 to 2025, and moved +17.0% in 2025.
- Median home value (owners' estimate)
- $1,822,400
- Median gross rent
- $3,500 or more
- Homes owned by their occupants
- 82.4%
- Housing units
- 7,675
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 06820?
709 business establishments had a location in this ZIP code in 2023, 9 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services111
- Retail trade90
- Finance and insurance83
- Health care and social assistance77
- Accommodation and food services74
- Other services (except public administration)74
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 06820?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 06906 | Stamford | 9,199 | $94k | 2.2 mi |
| 06853 | Norwalk | 3,171 | $250k+ | 2.3 mi |
| 06907 | Stamford | 8,705 | $106k | 2.7 mi |
| 06854 | Norwalk | 32,118 | $87k | 2.9 mi |
| 06902 | Stamford | 73,392 | $95k | 3.5 mi |
| 06850 | Norwalk | 19,692 | $124k | 4.0 mi |
| 06840 | New Canaan | 20,870 | $250k+ | 5.9 mi |
| 06901 | Stamford | 11,037 | $103k | 3.4 mi (near) |
| 06905 | Stamford | 20,725 | $137k | 3.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.