| ZIP Codes: | 39 ZIP Codes (31 Standard, 8 PO Box, 0 Unique) [See All] |
| Area Codes: | 860 / 959 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:11:36 PM |
| Population: | 210,396 [See All] |
| FIPS: | 09180 |
| CBSA: | Norwich-New London-Willimantic, CT |
| Land Area: | 639 sq mi |
| Water Area: | 27 sq mi |
| Coordinates: | 41.4745, -72.0893 |
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281,436 residents live across 39 ZIPs covering 639 sq mi, served by 38 distinct USPS-recognized cities.
Population moved from 288,389 to 281,344 from 2014 to 2024 — a -2.4% change. 12 ZIPs gained residents, 20 lost.
The planning region's wealthiest ZIP 06355 (Mystic, $137,425 median) and poorest ZIP 06226 (Willimantic, $47,162) are 25.5 miles apart — a 2.9× income gap across local geography.
Median home values vary 3.2× across this planning region — from $187,700 in 06256 (North Windham) to $593,400 in 06378 (Stonington).
Density varies 50× across the planning region — from 92 people/sq mi in 06359 (North Stonington) to 4,612 in 06320 (New London).
Educational attainment ranges from 19.6% bachelor's+ in 06280 (Windham) to 61.2% in 06378 (Stonington) — the breadth of educational profiles across the area.
Within Connecticut, this is the #6 most populous of 22 planning regions and ranks #14 for median household income .
Weighted by population, the typical household earns about $90,103 across the planning region — reflecting what a typical resident sees, not a simple ZIP average.
35.9% of adults age 25+ hold a bachelor's degree or higher (71,583 of 199,477 reporting).
31 Standard delivery, 8 PO Box only, 0 single-entity Unique ZIPs serve this planning region.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 06360 | Norwich | Standard | 37,216 | $65,539 | 28.2 | -0.4% |
| 06340 | Groton | Standard | 29,863 | $81,792 | 24.0 | -6.0% |
| 06320 | New London | Standard | 27,703 | $59,170 | 6.0 | 0.3% |
| 06226 | Willimantic | Standard | 19,344 | $47,162 | 7.0 | -4.3% |
| 06415 | Colchester | Standard | 16,038 | $123,256 | 57.1 | -4.8% |
| 06385 | Waterford | Standard | 15,966 | $100,484 | 26.1 | 2.9% |
| 06351 | Jewett City | Standard | 15,760 | $82,976 | 55.5 | -3.3% |
| 06355 | Mystic | Standard | 12,173 | $137,425 | 15.0 | -2.0% |
| 06357 | Niantic | Standard | 11,332 | $93,026 | 11.7 | -9.2% |
| 06382 | Uncasville | Standard | 10,143 | $89,635 | 18.7 | -12.4% |
| 06339 | Ledyard | Standard | 9,113 | $106,403 | 26.1 | 10.2% |
| 06379 | Pawcatuck | Standard | 9,017 | $95,066 | 12.6 | -3.2% |
| 06333 | East Lyme | Standard | 7,389 | $129,083 | 24.1 | 11.4% |
| 06370 | Oakdale | Standard | 7,327 | $105,700 | 25.0 | -6.1% |
| 06249 | Lebanon | Standard | 7,116 | $109,135 | 55.2 | -2.7% |
| 06335 | Gales Ferry | Standard | 6,307 | $118,116 | 12.1 | -7.1% |
| 06378 | Stonington | Standard | 5,555 | $135,714 | 21.2 | 6.8% |
| 06359 | North Stonington | Standard | 5,160 | $123,938 | 56.0 | -2.9% |
| 06365 | Preston | Standard | 4,807 | $117,045 | 31.7 | 1.5% |
| 06420 | Salem | Standard | 4,368 | $123,425 | 31.2 | 4.4% |
| 06375 | Quaker Hill | Standard | 3,670 | $111,833 | 8.6 | -11.3% |
| 06330 | Baltic | Standard | 3,327 | $98,698 | 18.1 | -1.0% |
| 06280 | Windham | Standard | 3,110 | $76,577 | 14.9 | 2.7% |
| 06380 | Taftville | Standard | 2,757 | $63,452 | 1.0 | -5.5% |
| 06334 | Bozrah | Standard | 2,249 | $107,969 | 19.7 | -14.0% |
| 06254 | North Franklin | Standard | 2,004 | $105,000 | 20.1 | 0.6% |
| 06256 | North Windham | Standard | 1,704 | $80,333 | 8.2 | -20.3% |
| 06353 | Montville | Standard | 439 | — | 0.3 | 1119.4% |
| 06266 | South Windham | Standard | 222 | — | 1.3 | -33.3% |
| 06350 | Hanover | PO Box | 121 | $40,950 | 0.0 | 105.1% |
| 06439 | Hadlyme | PO Box | 65 | $187,083 | 0.0 | — |
| 06336 | Gilman | Standard | 44 | $133,750 | 0.6 | 46.7% |
| 06338 | Mashantucket | PO Box | 27 | $137,500 | 1.7 | — |
| 06389 | Yantic | Standard | 0 | — | 0.2 | -100.0% |
| 06474 | North Westchester | PO Box | — | — | 0.0 | — |
| 06383 | Versailles | PO Box | — | — | 0.0 | — |
| 06372 | Old Mystic | PO Box | — | — | 0.0 | — |
| 06349 | Groton | PO Box | — | — | 0.5 | — |
| 06388 | West Mystic | PO Box | — | — | 0.0 | — |