ZIP Code 48611 — Auburn, MI
48611 is a standard (street delivery) ZIP code serving Auburn, Michigan, in Bay 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 48611 at a glance
| ZIP code | 48611 |
|---|---|
| Primary city | Auburn |
| State | Michigan (MI) |
| County | Bay FIPS 26017 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 6,093 |
| Coordinates | 43.631870, -84.093600 |
How ZIP+4 works in 48611
The four digits after the hyphen encode a delivery segment inside 48611. 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 48611 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 48611.
| ZIP | City | Distance |
|---|---|---|
| 48631 | Kawkawlin, MI | 5.9 mi |
| 48706 | Bay City, MI | 7.2 mi |
| 48710 | University Center, MI | 7.4 mi |
| 48623 | Freeland, MI | 8 mi |
| 48642 | Midland, MI | 8.2 mi |
| 48634 | Linwood, MI | 8.7 mi |
| 48604 | Saginaw, MI | 11.5 mi |
| 48603 | Saginaw, MI | 12 mi |
| 48640 | Midland, MI | 12.6 mi |
| 48708 | Bay City, MI | 13.3 mi |
| 48724 | Carrollton, MI | 14.7 mi |
| 48638 | Saginaw, MI | 15.3 mi |
Questions about 48611
What is the ZIP+4 code for 48611?
48611 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 48611, you need to look up a specific street address to get them.
What city is 48611?
48611 is assigned to Auburn, Michigan, in Bay 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.