ZIP Code 48889 — Sumner, MI
48889 is a standard (street delivery) ZIP code serving Sumner, Michigan, in Gratiot 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 48889 at a glance
| ZIP code | 48889 |
|---|---|
| Primary city | Sumner |
| State | Michigan (MI) |
| County | Gratiot FIPS 26057 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 1,528 |
| Coordinates | 43.291330, -84.797010 |
How ZIP+4 works in 48889
The four digits after the hyphen encode a delivery segment inside 48889. 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 48889 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 48889.
| ZIP | City | Distance |
|---|---|---|
| 48818 | Crystal, MI | 5.1 mi |
| 48856 | Middleton, MI | 7 mi |
| 48877 | Riverdale, MI | 7.9 mi |
| 48811 | Carson City, MI | 8.1 mi |
| 48832 | Elwell, MI | 8.4 mi |
| 48801 | Alma, MI | 8.5 mi |
| 48891 | Vestaburg, MI | 9.4 mi |
| 48847 | Ithaca, MI | 11.1 mi |
| 48871 | Perrinton, MI | 11.1 mi |
| 48874 | Pompeii, MI | 12.5 mi |
| 48862 | North Star, MI | 12.8 mi |
| 48845 | Hubbardston, MI | 13 mi |
Questions about 48889
What is the ZIP+4 code for 48889?
48889 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 48889, you need to look up a specific street address to get them.
What city is 48889?
48889 is assigned to Sumner, Michigan, in Gratiot 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.