ZIP Code 04538 — Boothbay Harbor, ME
04538 is a standard (street delivery) ZIP code serving Boothbay Harbor, Maine, in Lincoln County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 04538 at a glance
| ZIP code | 04538 |
|---|---|
| Primary city | Boothbay Harbor |
| State | Maine (ME) |
| County | Lincoln FIPS 23015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,810 |
| Coordinates | 43.856320, -69.628070 |
How ZIP+4 works in 04538
The four digits after the hyphen encode a delivery segment inside 04538. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 04538 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 04538.
| ZIP | City | Distance |
|---|---|---|
| 04575 | West Boothbay Harbor, ME | 1.6 mi |
| 04544 | East Boothbay, ME | 2.5 mi |
| 04576 | Southport, ME | 3 mi |
| 04537 | Boothbay, ME | 3.2 mi |
| 04570 | Squirrel Island, ME | 3.3 mi |
| 04571 | Trevett, ME | 3.8 mi |
| 04568 | South Bristol, ME | 4.3 mi |
| 04554 | New Harbor, ME | 6.2 mi |
| 04558 | Pemaquid, ME | 6.4 mi |
| 04548 | Georgetown, ME | 6.6 mi |
| 04541 | Chamberlain, ME | 7.5 mi |
| 04573 | Walpole, ME | 7.6 mi |
Questions about 04538
What is the ZIP+4 code for 04538?
04538 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 04538, you need to look up a specific street address to get them.
What city is 04538?
04538 is assigned to Boothbay Harbor, Maine, in Lincoln County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.