First three digits · Connecticut
ZIP Codes Starting with
14 ZIP codes start with 066, sorted at the Westchester, NY (SCF 105) sectional center (USPS labeling list L005, effective October 1, 2026) in Connecticut: 10 residential ZIP codes across 1 county and 4 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 066 mean?
The first digit, 0, is one of ten national areas (Connecticut, Massachusetts, Maine, New Hampshire, New Jersey, Puerto Rico, Rhode Island, Vermont, U.S. Virgin Islands and Armed Forces Europe). The first three, 066, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 066 to the Westchester, NY (SCF 105) facility. The last two digits pick the delivery area. By residents, the largest town names among the 066 ZIP codes are Bridgeport, Stratford, Trumbull and Easton.
The same facility sorts 8 prefixes, 229 ZIP codes in all: 066, 068, 069, 105, 106, 107, 108, 109.
Where are the 066 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 066
| County | ||||||
|---|---|---|---|---|---|---|
| 06601 | Bridgeport | Fairfield County | PO Box or unique | – | – | – |
| 06602 | Bridgeport | Fairfield County | PO Box or unique | – | – | – |
| 06604 | Bridgeport | Fairfield County | 31,771 | 10,070 | $50k | $267k |
| 06605 | Bridgeport | Fairfield County | 25,929 | 11,343 | $56k | $336k |
| 06606 | Bridgeport | Fairfield County | 49,308 | 9,335 | $73k | $289k |
| 06607 | Bridgeport | Fairfield County | 7,979 | 6,902 | $50k | $233k |
| 06608 | Bridgeport | Fairfield County | 12,146 | 11,815 | $46k | $236k |
| 06610 | Bridgeport | Fairfield County | 22,020 | 7,152 | $52k | $228k |
| 06611 | Trumbull | Fairfield County | 37,281 | 1,598 | $163k | $547k |
| 06612 | Easton | Fairfield County | 7,670 | 280 | $223k | $783k |
| 06614 | Stratford | Fairfield County | 35,654 | 3,219 | $111k | $375k |
| 06615 | Stratford | Fairfield County | 17,136 | 2,683 | $82k | $365k |
| 06673 | Bridgeport | Fairfield County | PO Box or unique | – | – | – |
| 06699 | Bridgeport | Fairfield County | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.