ZIP Code 55040 — Isanti, MN
55040 is a standard (street delivery) ZIP code serving Isanti, Minnesota, in Isanti 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 55040 at a glance
| ZIP code | 55040 |
|---|---|
| Primary city | Isanti |
| State | Minnesota (MN) |
| County | Isanti FIPS 27059 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 14,837 |
| Coordinates | 45.467800, -93.279510 |
How ZIP+4 works in 55040
The four digits after the hyphen encode a delivery segment inside 55040. 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 55040 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 55040.
| ZIP | City | Distance |
|---|---|---|
| 55005 | Bethel, MN | 6 mi |
| 55070 | Saint Francis, MN | 6.3 mi |
| 55008 | Cambridge, MN | 7.2 mi |
| 55011 | Cedar, MN | 8.8 mi |
| 55029 | Grandy, MN | 12.2 mi |
| 55079 | Stacy, MN | 12.6 mi |
| 55092 | Wyoming, MN | 13.5 mi |
| 55080 | Stanchfield, MN | 13.8 mi |
| 55303 | Anoka, MN | 14.2 mi |
| 55304 | Andover, MN | 14.6 mi |
| 55398 | Zimmerman, MN | 15.1 mi |
| 55017 | Dalbo, MN | 15.9 mi |
Questions about 55040
What is the ZIP+4 code for 55040?
55040 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 55040, you need to look up a specific street address to get them.
What city is 55040?
55040 is assigned to Isanti, Minnesota, in Isanti 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.