First three digits · Maine
ZIP Codes Starting with
31 ZIP codes start with 045, sorted at the Southern, ME (SCF 040) sectional center (USPS labeling list L005, effective October 1, 2026) in Maine: 29 residential ZIP codes across 3 counties and 2 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 045 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, 045, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 045 to the Southern, ME (SCF 040) facility. The last two digits pick the delivery area. By residents, the largest town names among the 045 ZIP codes are Bath, Waldoboro, Wiscasset, Woolwich, Phippsburg and Damariscotta.
The same facility sorts 7 prefixes, 240 ZIP codes in all: 039, 040, 041, 042, 043, 045, 048.
Where are the 045 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 045
| County | ||||||
|---|---|---|---|---|---|---|
| 04530 | Bath | Sagadahoc County | 11,275 | 392 | $80k | $337k |
| 04535 | Alna | Lincoln County | 818 | 39 | $93k | $367k |
| 04537 | Boothbay | Lincoln County | 1,685 | 105 | $77k | $359k |
| 04538 | Boothbay Harbor | Lincoln County | 1,810 | 400 | $57k | $388k |
| 04539 | Bristol | Lincoln County | 1,456 | 88 | $96k | $347k |
| 04541 | Chamberlain | Lincoln County | 45 | 129 | – | – |
| 04543 | Damariscotta | Lincoln County | 2,192 | 176 | $59k | $364k |
| 04544 | East Boothbay | Lincoln County | 978 | 260 | $59k | $412k |
| 04547 | Friendship | Knox County | 1,213 | 86 | $76k | $275k |
| 04548 | Georgetown | Sagadahoc County | 1,012 | 54 | $84k | $427k |
| 04549 | Isle Of Springs | Lincoln County | PO Box or unique | – | – | – |
| 04551 | Bremen | Lincoln County | 917 | 56 | $100k | $425k |
| 04553 | Newcastle | Lincoln County | 1,913 | 66 | $90k | $398k |
| 04554 | New Harbor | Lincoln County | 514 | 126 | $85k | $502k |
| 04555 | Nobleboro | Lincoln County | 1,906 | 101 | $100k | $353k |
| 04556 | Edgecomb | Lincoln County | 1,251 | 69 | $109k | $348k |
| 04558 | Pemaquid | Lincoln County | 382 | 69 | $92k | $527k |
| 04562 | Phippsburg | Sagadahoc County | 2,238 | 78 | $108k | $336k |
| 04563 | Cushing | Knox County | 1,460 | 76 | $84k | $410k |
| 04564 | Round Pond | Lincoln County | 520 | 69 | $133k | $579k |
| 04565 | Sebasco Estates | Sagadahoc County | PO Box or unique | – | – | – |
| 04568 | South Bristol | Lincoln County | 512 | 98 | $55k | $550k |
| 04570 | Squirrel Island | Lincoln County | 3 | 11 | – | – |
| 04571 | Trevett | Lincoln County | 439 | 211 | $59k | $257k |
| 04572 | Waldoboro | Lincoln County | 5,253 | 73 | $69k | $275k |
| 04573 | Walpole | Lincoln County | 557 | 71 | $86k | $420k |
| 04574 | Washington | Knox County | 1,624 | 43 | $60k | $195k |
| 04575 | West Boothbay Harbor | Lincoln County | 286 | 244 | $116k | $641k |
| 04576 | Southport | Lincoln County | 547 | 107 | $89k | $490k |
| 04578 | Wiscasset | Lincoln County | 4,709 | 141 | $81k | $327k |
| 04579 | Woolwich | Sagadahoc County | 3,158 | 90 | $102k | $255k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.