ZIP Code 48631 — Kawkawlin, MI
48631 is a standard (street delivery) ZIP code serving Kawkawlin, 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 48631 at a glance
| ZIP code | 48631 |
|---|---|
| Primary city | Kawkawlin |
| State | Michigan (MI) |
| County | Bay FIPS 26017 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 3,681 |
| Coordinates | 43.684900, -84.001550 |
How ZIP+4 works in 48631
The four digits after the hyphen encode a delivery segment inside 48631. 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 48631 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 48631.
| ZIP | City | Distance |
|---|---|---|
| 48634 | Linwood, MI | 5.4 mi |
| 48611 | Auburn, MI | 5.9 mi |
| 48706 | Bay City, MI | 6.3 mi |
| 48710 | University Center, MI | 8.9 mi |
| 48642 | Midland, MI | 11.4 mi |
| 48650 | Pinconning, MI | 11.5 mi |
| 48708 | Bay City, MI | 11.7 mi |
| 48732 | Essexville, MI | 12.2 mi |
| 48604 | Saginaw, MI | 13.1 mi |
| 48623 | Freeland, MI | 13.2 mi |
| 48652 | Rhodes, MI | 15.2 mi |
| 48603 | Saginaw, MI | 15.4 mi |
Questions about 48631
What is the ZIP+4 code for 48631?
48631 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 48631, you need to look up a specific street address to get them.
What city is 48631?
48631 is assigned to Kawkawlin, 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.