ZIP Code 04645 — Isle Au Haut, ME
04645 is a standard (street delivery) ZIP code serving Isle Au Haut, Maine, in Knox 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 04645 at a glance
| ZIP code | 04645 |
|---|---|
| Primary city | Isle Au Haut |
| State | Maine (ME) |
| County | Knox FIPS 23013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 69 |
| Coordinates | 44.054080, -68.628200 |
How ZIP+4 works in 04645
The four digits after the hyphen encode a delivery segment inside 04645. 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 04645 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 04645.
| ZIP | City | Distance |
|---|---|---|
| 04681 | Stonington, ME | 7.9 mi |
| 04863 | Vinalhaven, ME | 10.8 mi |
| 04627 | Deer Isle, ME | 11.8 mi |
| 04685 | Swans Island, ME | 11.8 mi |
| 04853 | North Haven, ME | 13.5 mi |
| 04635 | Frenchboro, ME | 14.2 mi |
| 04683 | Sunset, ME | 15.9 mi |
| 04616 | Brooklin, ME | 16.1 mi |
| 04650 | Little Deer Isle, ME | 16.8 mi |
| 04673 | Sargentville, ME | 17.4 mi |
| 04612 | Bernard, ME | 18.9 mi |
| 04653 | Bass Harbor, ME | 19 mi |
Questions about 04645
What is the ZIP+4 code for 04645?
04645 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 04645, you need to look up a specific street address to get them.
What city is 04645?
04645 is assigned to Isle Au Haut, Maine, in Knox 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.