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 High-density area
- $250,000+
- Median income Above-median income area
- $1,822,400
- Median home value Above-median home value
- 85.9%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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 $250,000+ (121% above the average Connecticut ZIP), while per-capita income is $152,454. The poverty rate is 5.8%, with unemployment at 5.1%; those measures add context to the income figure. Housing is both higher-cost and owner-heavy: median home value is $1,822,400 (320% above the average Connecticut ZIP), while 82.4% of occupied homes are owner-occupied and median rent is $3,501.
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. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Fairfield County, so 06820 can be compared with both its immediate and county-level context.
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.
- Professional, scientific, and technical services
Professional, scientific, and technical services
111 establishments
- Retail trade
Retail trade
90 establishments
- Finance and insurance
Finance and insurance
83 establishments
- Health care and social assistance
Health care and social assistance
77 establishments
- Accommodation and food services
Accommodation and food services
74 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, 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
Who lives in ZIP 06820?
40.0
Median Age
49.4%
Male
50.6%
Female
12.2%
Foreign-Born
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?
$250,000+
Median Household Income
+121% vs state ZIP avg
$152,454
Per Capita Income
5.8%
Poverty Rate
5.1%
Unemployment Rate
38.6 min
Mean Commute Time
How ZIP 06820 ranks among Connecticut ZIPs
Darien, CT household income vs. every Connecticut ZIP code
Median household income among 270 reporting Connecticut ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$250,000 Top 3% higher than 97% of 270 Connecticut ZIPs
Each bar is a $20K-wide band; taller bars hold more Connecticut 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
7,675housing units
7,675
Total Housing Units
7,234
Occupied Units
441
Vacant Units
3.02
Avg Household Size
Occupancy Type
$1,822,400
Median Home Value
+320% vs state ZIP avg
$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.
- 06902
Stamford (06902)
63,406 residents
- 06854
Norwalk (06854)
29,100 residents
- 06820 20,732
Darien (06820)
20,732 residents
- 06840 19,738
New Canaan (06840)
19,738 residents
- 06905 19,649
Stamford (06905)
19,649 residents
- 06850 18,078
Norwalk (06850)
18,078 residents
- 06906 9,088
Stamford (06906)
9,088 residents
- 06907 9,016
Stamford (06907)
9,016 residents
- 06901 6,828
Stamford (06901)
6,828 residents
What this shows Among its immediate neighbors, ZIP 06820 ranks #3 by population - useful context the national average alone can't give.
ZIP 06820 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 06820
Darien (06820)
$250,000 median income
- 06840
New Canaan (06840)
$250,000 median income
- 06853
Norwalk (06853)
$250,000 median income
- 06905
Stamford (06905)
$136,757 median income
- 06850
Norwalk (06850)
$123,633 median income
- 06907
Stamford (06907)
$106,379 median income
- 06901
Stamford (06901)
$102,641 median income
- 06902 $94,843
Stamford (06902)
$94,843 median income
- 06906 $93,675
Stamford (06906)
$93,675 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 06820, both outside CT so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (20,732 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Fairfield County
Related Areas
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 $250,000+, 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.
Related
Take this with you
What to do with ZIP 06820's numbers, next.
- See how ZIP 06820 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Darien, CT ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
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ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.