ZIP Code 56431 — Aitkin, MN
56431 is a standard (street delivery) ZIP code serving Aitkin, Minnesota, in Aitkin 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 56431 at a glance
| ZIP code | 56431 |
|---|---|
| Primary city | Aitkin |
| State | Minnesota (MN) |
| County | Aitkin FIPS 27001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 9,312 |
| Coordinates | 46.482800, -93.643560 |
How ZIP+4 works in 56431
The four digits after the hyphen encode a delivery segment inside 56431. 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 56431 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 56431.
| ZIP | City | Distance |
|---|---|---|
| 56444 | Deerwood, MN | 12 mi |
| 56455 | Ironton, MN | 17.4 mi |
| 56441 | Crosby, MN | 17.8 mi |
| 56450 | Garrison, MN | 19.5 mi |
| 55760 | Mcgregor, MN | 20.3 mi |
| 56469 | Palisade, MN | 20.8 mi |
| 56447 | Emily, MN | 21.7 mi |
| 56350 | Mcgrath, MN | 22.6 mi |
| 56465 | Merrifield, MN | 22.6 mi |
| 56342 | Isle, MN | 23.6 mi |
| 56401 | Brainerd, MN | 25.2 mi |
| 56442 | Crosslake, MN | 25.4 mi |
Questions about 56431
What is the ZIP+4 code for 56431?
56431 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 56431, you need to look up a specific street address to get them.
What city is 56431?
56431 is assigned to Aitkin, Minnesota, in Aitkin 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.