Zip Code 06340 — Groton, CT
06340 is a ZIP Code associated with Groton, CT, located within Southeastern Connecticut. 06340 ranks #2 out of 33 ZIP codes in Southeastern Connecticut County by population (and #31 out of 288 in CT). The area supports an estimated population of 29,863 residents across Data Pending housing units, with a population density of 511.5 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (41.356430, -72.044770)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 06340 |
| Primary City | Groton |
| State / Province | CT |
| County | Southeastern Connecticut |
| Total Population | 29,863 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 511.5 people/sq mi |
| Timezone | America/New_York |
How 06340 Compares
| Metric | ZIP 06340 | Southeastern Connecticut County | CT State Average |
|---|
| Population | 29,863 | 281,371 (Total) | 3,624,508 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 511.5 /sq mi | -- | -- |
| County Pop Rank | #2 of 33 | -- | -- |
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 →