| ZIP Codes: | 25 ZIP Codes (21 Standard, 3 PO Box, 1 Unique) [See All] |
| Area Codes: | 203 / 475 / 860 / 959 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:11:35 PM |
| Population: | 24,851 [See All] |
| FIPS: | 09110 |
| CBSA: | Hartford-West Hartford-East Hartford, CT |
| Land Area: | 435 sq mi |
| Water Area: | 23 sq mi |
| Coordinates: | 41.5428, -72.8249 |
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175,281 residents live across 25 ZIPs covering 435 sq mi, served by 24 distinct USPS-recognized cities.
Population moved from 174,773 to 174,043 from 2014 to 2024 — a -0.4% change. 11 ZIPs gained residents, 13 lost.
The planning region's wealthiest ZIP 06422 (Durham, $158,857 median) and poorest ZIP 06457 (Middletown, $79,463) are 6.4 miles apart — a 2.0× income gap across local geography.
Median home values vary 2.5× across this planning region — from $295,300 in 06457 (Middletown) to $729,200 in 06426 (Essex).
Density varies 76× across the planning region — from 135 people/sq mi in 06423 (East Haddam) to 10,257 in 06459 (Middletown).
Educational attainment ranges from 33.3% bachelor's+ in 06469 (Moodus) to 63.1% in 06426 (Essex) — the breadth of educational profiles across the area.
Within Connecticut, this is the #16 most populous of 22 planning regions and ranks #21 for median household income .
Hosts 1 single-entity Unique ZIP: 06459Middletown .
Weighted by population, the typical household earns about $107,434 across the planning region — reflecting what a typical resident sees, not a simple ZIP average.
46.0% of adults age 25+ hold a bachelor's degree or higher (60,127 of 130,812 reporting).
21 Standard delivery, 3 PO Box only, 1 single-entity Unique ZIPs serve this planning region.
1 ZIP in this planning region where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 06457 | Middletown | Standard | 46,720 | $79,463 | 42.8 | -1.5% |
| 06416 | Cromwell | Standard | 14,334 | $110,596 | 13.5 | 1.8% |
| 06413 | Clinton | Standard | 13,377 | $124,824 | 16.5 | 1.7% |
| 06424 | East Hampton | Standard | 12,751 | $123,680 | 41.8 | -0.2% |
| 06475 | Old Saybrook | Standard | 10,575 | $114,333 | 16.1 | 3.5% |
| 06371 | Old Lyme | Standard | 9,828 | $132,045 | 58.6 | 0.7% |
| 06480 | Portland | Standard | 9,434 | $118,929 | 23.2 | -0.5% |
| 06422 | Durham | Standard | 7,208 | $158,857 | 24.1 | -2.2% |
| 06498 | Westbrook | Standard | 6,856 | $91,202 | 16.1 | -1.4% |
| 06419 | Killingworth | Standard | 6,240 | $140,655 | 35.7 | -4.2% |
| 06441 | Higganum | Standard | 5,348 | $111,250 | 24.4 | -1.5% |
| 06423 | East Haddam | Standard | 5,182 | $107,549 | 38.5 | 3.4% |
| 06417 | Deep River | Standard | 4,458 | $90,253 | 15.1 | -3.3% |
| 06412 | Chester | Standard | 3,825 | $109,191 | 16.8 | -9.4% |
| 06469 | Moodus | Standard | 3,311 | $104,888 | 10.4 | -3.1% |
| 06426 | Essex | Standard | 3,267 | $103,705 | 6.9 | 6.2% |
| 06438 | Haddam | Standard | 2,887 | $121,429 | 14.7 | 5.7% |
| 06442 | Ivoryton | Standard | 2,826 | $104,358 | 3.7 | -7.9% |
| 06455 | Middlefield | Standard | 2,480 | $104,180 | 11.0 | -25.9% |
| 06481 | Rockfall | Standard | 1,763 | $84,674 | 1.9 | 63.2% |
| 06459 | Middletown | Unique | 1,238 | — | 0.1 | — |
| 06409 | Centerbrook | Standard | 701 | $107,909 | 1.2 | 40.8% |
| 06414 | Cobalt | PO Box | 302 | $131,090 | 0.9 | 174.5% |
| 06456 | Middle Haddam | PO Box | 281 | $128,542 | 0.9 | 16.1% |
| 06376 | South Lyme | PO Box | 89 | $156,000 | 0.0 | -53.4% |