ZIP Code 04355 — Readfield, ME
04355 is a standard (street delivery) ZIP code serving Readfield, Maine, in Kennebec 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 04355 at a glance
| ZIP code | 04355 |
|---|---|
| Primary city | Readfield |
| State | Maine (ME) |
| County | Kennebec FIPS 23011 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,651 |
| Coordinates | 44.382270, -69.949150 |
How ZIP+4 works in 04355
The four digits after the hyphen encode a delivery segment inside 04355. 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 04355 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 04355.
| ZIP | City | Distance |
|---|---|---|
| 04364 | Winthrop, ME | 4.9 mi |
| 04351 | Manchester, ME | 5.6 mi |
| 04352 | Mount Vernon, ME | 5.7 mi |
| 04284 | Wayne, ME | 6.2 mi |
| 04349 | Kents Hill, ME | 7.1 mi |
| 04265 | North Monmouth, ME | 8.7 mi |
| 04917 | Belgrade, ME | 9.1 mi |
| 04347 | Hallowell, ME | 9.2 mi |
| 04254 | Livermore Falls, ME | 10.2 mi |
| 04330 | Augusta, ME | 10.5 mi |
| 04344 | Farmingdale, ME | 10.6 mi |
| 04263 | Leeds, ME | 10.8 mi |
Questions about 04355
What is the ZIP+4 code for 04355?
04355 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 04355, you need to look up a specific street address to get them.
What city is 04355?
04355 is assigned to Readfield, Maine, in Kennebec 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.