First three digits · Connecticut and New York
ZIP Codes Starting with
40 ZIP codes start with 063, sorted at the Hartford, CT (SCF 060) sectional center (USPS labeling list L005, effective October 1, 2026) in Connecticut and New York: 36 residential ZIP codes across 3 counties and 4 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 063 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, 063, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 063 to the Hartford, CT (SCF 060) facility. The last two digits pick the delivery area. By residents, the largest town names among the 063 ZIP codes are Norwich, Groton, New London, Waterford, Jewett City and Mystic.
The same facility sorts 10 prefixes, 484 ZIP codes in all: 010, 011, 012, 060, 061, 062, 063, 064, 065, 067.
Where are the 063 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 063
| County | ||||||
|---|---|---|---|---|---|---|
| 06320 | New London | New London County | 27,703 | 4,921 | $59k | $253k |
| 06330 | Baltic | New London County | 3,327 | 194 | $99k | $279k |
| 06331 | Canterbury | Windham County | 5,145 | 126 | $103k | $334k |
| 06332 | Central Village | Windham County | 1,015 | 817 | $62k | $235k |
| 06333 | East Lyme | New London County | 7,389 | 315 | $129k | $439k |
| 06334 | Bozrah | New London County | 2,249 | 116 | $108k | $310k |
| 06335 | Gales Ferry | New London County | 6,307 | 576 | $118k | $322k |
| 06336 | Gilman | New London County | 44 | 72 | $134k | – |
| 06338 | Mashantucket | New London County | 27 | 14 | $138k | $433k |
| 06339 | Ledyard | New London County | 9,113 | 356 | $106k | $331k |
| 06340 | Groton | New London County | 29,863 | 1,325 | $82k | $295k |
| 06349 | Groton | New London County | PO Box or unique | – | – | – |
| 06350 | Hanover | New London County | 121 | 314 | $41k | – |
| 06351 | Jewett City | New London County | 15,760 | 300 | $83k | $294k |
| 06353 | Montville | New London County | 439 | 1,657 | – | – |
| 06354 | Moosup | Windham County | 6,031 | 274 | $88k | $299k |
| 06355 | Mystic | New London County | 12,173 | 858 | $137k | $453k |
| 06357 | Niantic | New London County | 11,332 | 1,070 | $93k | $397k |
| 06359 | North Stonington | New London County | 5,160 | 95 | $124k | $397k |
| 06360 | Norwich | New London County | 37,216 | 1,388 | $66k | $246k |
| 06365 | Preston | New London County | 4,807 | 158 | $117k | $361k |
| 06370 | Oakdale | New London County | 7,327 | 307 | $106k | $333k |
| 06371 | Old Lyme | New London County | 9,828 | 182 | $132k | $499k |
| 06372 | Old Mystic | New London County | PO Box or unique | – | – | – |
| 06373 | Oneco | Windham County | 219 | 118 | – | $271k |
| 06374 | Plainfield | Windham County | 7,838 | 306 | $72k | $249k |
| 06375 | Quaker Hill | New London County | 3,670 | 459 | $112k | $326k |
| 06376 | South Lyme | New London County | 89 | 3,296 | $156k | $444k |
| 06377 | Sterling | Windham County | 2,927 | 181 | $97k | $276k |
| 06378 | Stonington | New London County | 5,555 | 266 | $136k | $593k |
| 06379 | Pawcatuck | New London County | 9,017 | 738 | $95k | $406k |
| 06380 | Taftville | New London County | 2,757 | 2,860 | $64k | $194k |
| 06382 | Uncasville | New London County | 10,143 | 577 | $90k | $268k |
| 06383 | Versailles | New London County | PO Box or unique | – | – | – |
| 06384 | Voluntown | New London County | 2,663 | 71 | $107k | $355k |
| 06385 | Waterford | New London County | 15,966 | 641 | $101k | $365k |
| 06387 | Wauregan | Windham County | 178 | 3,069 | $109k | $271k |
| 06388 | West Mystic | New London County | PO Box or unique | – | – | – |
| 06389 | Yantic | New London County | no residents | 0 | – | – |
| 06390 | Fishers Island | Suffolk County | 72 | 18 | $98k | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.