ZIP Code 48439 — Grand Blanc, MI
48439 is a standard (street delivery) ZIP code serving Grand Blanc, Michigan, in Genesee 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 48439 at a glance
| ZIP code | 48439 |
|---|---|
| Primary city | Grand Blanc |
| State | Michigan (MI) |
| County | Genesee FIPS 26049 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 51,900 |
| Coordinates | 42.917330, -83.630180 |
How ZIP+4 works in 48439
The four digits after the hyphen encode a delivery segment inside 48439. 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 48439 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 48439.
| ZIP | City | Distance |
|---|---|---|
| 48529 | Burton, MI | 4.1 mi |
| 48519 | Burton, MI | 5 mi |
| 48411 | Atlas, MI | 5.1 mi |
| 48507 | Flint, MI | 5.5 mi |
| 48503 | Flint, MI | 7.1 mi |
| 48502 | Flint, MI | 7.3 mi |
| 48509 | Burton, MI | 7.6 mi |
| 48438 | Goodrich, MI | 7.7 mi |
| 48442 | Holly, MI | 8.7 mi |
| 48473 | Swartz Creek, MI | 10.1 mi |
| 48423 | Davison, MI | 10.3 mi |
| 48506 | Flint, MI | 10.4 mi |
Questions about 48439
What is the ZIP+4 code for 48439?
48439 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 48439, you need to look up a specific street address to get them.
What city is 48439?
48439 is assigned to Grand Blanc, Michigan, in Genesee 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.