PlainZIP

Darien, CT · standard

ZIP Code 06820

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

20,732
633/sq mi
$250,001
Median income
$1,822,400
Median home value
85.9%
Bachelor's or higher

The verdict

Darien 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
633
people per sq mi
82%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 06820 against every reporting US ZIP.

ZIP code 06820 is a densely settled ZIP (a standard USPS delivery area) in Darien, Fairfield County, Connecticut, with 20,732 residents across 32.8 square miles, a density of 633 people per square mile, in the New York time zone.

ZIP 06820 skews affluent, with a median household income of $250,001 (121% above the Connecticut average), while per-capita income is $152,454. Poverty here runs at 5.8%, with unemployment measured at 5.1%. The typical home here is valued at $1,822,400 (320% above the state average); renters pay a median of $3,501 monthly, and 82.4% of units are owner-occupied.

This is a highly-educated ZIP: 85.9% of adults hold a bachelor's degree or higher, the median age is 40, and the average commute is 39 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Fairfield County, so you can benchmark 06820 against its immediate geography rather than a 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 06820

Top 5 sectors by establishment count in Darien, CT

Which industries have the most business establishments in ZIP 06820.

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 06820, Darien, 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

20,732

Population

32.8

Area (sq mi)

633

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 06820?

40.0

Median Age

49.4%

Male

50.6%

Female

12.2%

Foreign-Born

White 81.5%
African American 0.6%
Asian 7.4%
American Indian or Alaska Native 0.1%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 8.5%
Hispanic or Latino 5.8%

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

$152,454

Per Capita Income

5.8%

Poverty Rate

5.1%

Unemployment Rate

38.6 min

Mean Commute Time

How ZIP 06820 ranks nationally

Darien, 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 90.7%
Bachelor's Degree or Higher 85.9%

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

What does housing look like?

7,675

Total Housing Units

7,234

Occupied Units

441

Vacant Units

3.02

Avg Household Size

Occupancy Type

Owner 82.4%
Renter 17.6%

$1,822,400

Median Home Value

+320% vs state

$3,501

Median Rent

1956

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

+0.8%

YoY Change (2024)

243

HPI Index (2000 = 100)

+143%

Total Change Since 2000

Home values in ZIP 06820 have increased 0.8% over the past year (2024). Since 2000, this ZIP has seen +143% cumulative appreciation.

Year Annual Change HPI Index
2020 +0.9% 175
2021 +5.0% 183
2022 +8.1% 198
2023 +21.7% 241
2024 +0.8% 243

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 2024. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 709 business establishments in ZIP 06820, employing approximately 6,576 people with a combined annual payroll of $481,008,000.

709

Businesses

6,576

Employees

$481.0M

Annual Payroll

16

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 111 15.7%
Retail trade 90 12.7%
Finance and insurance 83 11.7%
Health care and social assistance 77 10.9%
Accommodation and food services 74 10.4%
Other services (except public administration) 74 10.4%
Administrative and support and waste management and remediation services 41 5.8%
Real estate and rental and leasing 31 4.4%
Construction 30 4.2%
Arts, entertainment, and recreation 28 4.0%
Wholesale trade 17 2.4%
Educational services 15 2.1%
Transportation and warehousing 12 1.7%
Information 9 1.3%
Management of companies and enterprises 8 1.1%
Manufacturing 5 0.7%

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 06820 vs 06906 →

ZIP 06820 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 06820 ranks #3 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 06820 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 06820 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
06906 Stamford, CT 9,088 2.2 mi
06853 Norwalk, CT 3,646 2.4 mi
06907 Stamford, CT 9,016 2.5 mi
06854 Norwalk, CT 29,100 2.9 mi
06905 Stamford, CT 19,649 3.3 mi
06901 Stamford, CT 6,828 3.4 mi
06902 Stamford, CT 63,406 3.6 mi
06850 Norwalk, CT 18,078 3.9 mi
06856 Norwalk, CT 3 3.9 mi
06840 New Canaan, CT 19,738 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 Darien, CT Connecticut

Frequently Asked Questions

What county is ZIP code 06820 in? ▼
ZIP code 06820 (Darien) 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 06820? ▼
ZIP code 06820 in Darien, CT has a population of 20,732 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 06820? ▼
The median household income in ZIP 06820 is $250,001, which is 228% above the national average of $76,288.
What is the average home value in ZIP 06820? ▼
The median home value in ZIP 06820 is $1,822,400, which is 555% above the national average of $278,155.
What is the demographic makeup of ZIP 06820? ▼
The largest racial group in ZIP 06820 is White at 81.5%. Hispanic or Latino residents make up 5.8% of the population.
How many businesses are in ZIP code 06820? ▼
ZIP code 06820 has 709 business establishments employing approximately 6,576 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 06820? ▼
The top industries by establishment count in ZIP 06820 are: Professional, scientific, and technical services (111), Retail trade (90), Finance and insurance (83). There are 16 industry sectors represented in total.
How have home values changed in ZIP code 06820? ▼
According to the FHFA House Price Index, home values in ZIP 06820 increased by 0.8% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 143%. 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 06820? ▼
In ZIP code 06820, 90.7% of residents aged 25+ have a high school diploma or higher, and 85.9% 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 06820? ▼
The mean commute time for workers in ZIP code 06820 is 38.6 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 06820? ▼
In ZIP code 06820, approximately 82.4% of occupied housing units are owner-occupied and 17.6% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 06820? ▼
The poverty rate in ZIP code 06820 is 5.8% 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.