ZIP Code 55309 — Big Lake, MN
55309 is a standard (street delivery) ZIP code serving Big Lake, Minnesota, in Sherburne 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 55309 at a glance
| ZIP code | 55309 |
|---|---|
| Primary city | Big Lake |
| State | Minnesota (MN) |
| County | Sherburne FIPS 27141 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 21,378 |
| Coordinates | 45.377580, -93.741070 |
How ZIP+4 works in 55309
The four digits after the hyphen encode a delivery segment inside 55309. 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 55309 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 55309.
| ZIP | City | Distance |
|---|---|---|
| 55308 | Becker, MN | 5.8 mi |
| 55362 | Monticello, MN | 7 mi |
| 55330 | Elk River, MN | 8.9 mi |
| 55398 | Zimmerman, MN | 9.2 mi |
| 55301 | Albertville, MN | 9.9 mi |
| 55319 | Clear Lake, MN | 11.8 mi |
| 55376 | Saint Michael, MN | 11.8 mi |
| 55313 | Buffalo, MN | 15 mi |
| 55371 | Princeton, MN | 15.4 mi |
| 55358 | Maple Lake, MN | 15.5 mi |
| 55341 | Hanover, MN | 15.6 mi |
| 55374 | Rogers, MN | 15.9 mi |
Questions about 55309
What is the ZIP+4 code for 55309?
55309 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 55309, you need to look up a specific street address to get them.
What city is 55309?
55309 is assigned to Big Lake, Minnesota, in Sherburne 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.