ZIP Code 55921 — Caledonia, MN
55921 is a standard (street delivery) ZIP code serving Caledonia, Minnesota, in Houston 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 55921 at a glance
| ZIP code | 55921 |
|---|---|
| Primary city | Caledonia |
| State | Minnesota (MN) |
| County | Houston FIPS 27055 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 4,659 |
| Coordinates | 43.622650, -91.463880 |
How ZIP+4 works in 55921
The four digits after the hyphen encode a delivery segment inside 55921. 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 55921 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 55921.
| ZIP | City | Distance |
|---|---|---|
| 55931 | Eitzen, MN | 8.2 mi |
| 55919 | Brownsville, MN | 8.5 mi |
| 55941 | Hokah, MN | 9 mi |
| 55974 | Spring Grove, MN | 9.5 mi |
| 52160 | New Albin, IA | 12.1 mi |
| 52140 | Dorchester, IA | 12.9 mi |
| 55943 | Houston, MN | 13 mi |
| 54658 | Stoddard, WI | 14.1 mi |
| 55947 | La Crescent, MN | 14.9 mi |
| 54632 | Genoa, WI | 16.4 mi |
| 55954 | Mabel, MN | 16.5 mi |
| 54621 | Chaseburg, WI | 19.2 mi |
Questions about 55921
What is the ZIP+4 code for 55921?
55921 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 55921, you need to look up a specific street address to get them.
What city is 55921?
55921 is assigned to Caledonia, Minnesota, in Houston 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.