ZIP Code 55781 — Side Lake, MN
55781 is a standard (street delivery) ZIP code serving Side Lake, Minnesota, in Itasca 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 55781 at a glance
| ZIP code | 55781 |
|---|---|
| Primary city | Side Lake |
| State | Minnesota (MN) |
| County | Itasca FIPS 27061 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 821 |
| Coordinates | 47.675870, -93.065240 |
How ZIP+4 works in 55781
The four digits after the hyphen encode a delivery segment inside 55781. 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 55781 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 55781.
| ZIP | City | Distance |
|---|---|---|
| 55719 | Chisholm, MN | 12.8 mi |
| 55703 | Angora, MN | 13.9 mi |
| 55723 | Cook, MN | 14.5 mi |
| 55769 | Nashwauk, MN | 14.6 mi |
| 55710 | Britt, MN | 17.3 mi |
| 55713 | Buhl, MN | 18.9 mi |
| 55753 | Keewatin, MN | 19.3 mi |
| 55758 | Kinney, MN | 19.7 mi |
| 56628 | Bigfork, MN | 21.2 mi |
| 55768 | Mountain Iron, MN | 21.4 mi |
| 55746 | Hibbing, MN | 22.5 mi |
| 55709 | Bovey, MN | 23.8 mi |
Questions about 55781
What is the ZIP+4 code for 55781?
55781 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 55781, you need to look up a specific street address to get them.
What city is 55781?
55781 is assigned to Side Lake, Minnesota, in Itasca 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.