ZIP Code 55920 — Byron, MN
55920 is a standard (street delivery) ZIP code serving Byron, Minnesota, in Olmsted 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 55920 at a glance
| ZIP code | 55920 |
|---|---|
| Primary city | Byron |
| State | Minnesota (MN) |
| County | Olmsted FIPS 27109 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 9,271 |
| Coordinates | 44.012460, -92.621110 |
How ZIP+4 works in 55920
The four digits after the hyphen encode a delivery segment inside 55920. 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 55920 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 55920.
| ZIP | City | Distance |
|---|---|---|
| 55905 | Rochester, MN | 5.6 mi |
| 55944 | Kasson, MN | 6 mi |
| 55902 | Rochester, MN | 6.1 mi |
| 55901 | Rochester, MN | 7.4 mi |
| 55955 | Mantorville, MN | 8 mi |
| 55903 | Rochester, MN | 9.2 mi |
| 55960 | Oronoco, MN | 9.9 mi |
| 55904 | Rochester, MN | 11.5 mi |
| 55963 | Pine Island, MN | 12.3 mi |
| 55976 | Stewartville, MN | 12.3 mi |
| 55940 | Hayfield, MN | 12.3 mi |
| 55927 | Dodge Center, MN | 12.6 mi |
Questions about 55920
What is the ZIP+4 code for 55920?
55920 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 55920, you need to look up a specific street address to get them.
What city is 55920?
55920 is assigned to Byron, Minnesota, in Olmsted 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.