Zip Code 06820 — Darien, CT
06820 is a ZIP Code associated with Darien, CT, located within Western Connecticut. 06820 ranks #10 out of 34 ZIP codes in Western Connecticut County by population (and #59 out of 288 in CT). The area supports an estimated population of 21,936 residents across Data Pending housing units, with a population density of 669.3 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (41.079830, -73.482420)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 06820 |
| Primary City | Darien |
| State / Province | CT |
| County | Western Connecticut |
| Total Population | 21,936 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 669.3 people/sq mi |
| Timezone | America/New_York |
How 06820 Compares
| Metric | ZIP 06820 | Western Connecticut County | CT State Average |
|---|
| Population | 21,936 | 627,079 (Total) | 3,624,508 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 669.3 /sq mi | -- | -- |
| County Pop Rank | #10 of 34 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →