ZIP Code 48059 — Fort Gratiot, MI
48059 is a standard (street delivery) ZIP code serving Fort Gratiot, Michigan, in St. Clair 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 48059 at a glance
| ZIP code | 48059 |
|---|---|
| Primary city | Fort Gratiot |
| State | Michigan (MI) |
| County | St. Clair FIPS 26147 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 15,499 |
| Coordinates | 43.082530, -82.499130 |
How ZIP+4 works in 48059
The four digits after the hyphen encode a delivery segment inside 48059. 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 48059 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 48059.
| ZIP | City | Distance |
|---|---|---|
| 48049 | North Street, MI | 5 mi |
| 48032 | Jeddo, MI | 5.9 mi |
| 48060 | Port Huron, MI | 7.4 mi |
| 48074 | Smiths Creek, MI | 9.8 mi |
| 48006 | Avoca, MI | 10 mi |
| 48450 | Lexington, MI | 11.9 mi |
| 48040 | Marysville, MI | 12 mi |
| 48027 | Goodells, MI | 13.3 mi |
| 48422 | Croswell, MI | 14.6 mi |
| 48079 | Saint Clair, MI | 15.7 mi |
| 48022 | Emmett, MI | 16.2 mi |
| 48097 | Yale, MI | 16.9 mi |
Questions about 48059
What is the ZIP+4 code for 48059?
48059 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 48059, you need to look up a specific street address to get them.
What city is 48059?
48059 is assigned to Fort Gratiot, Michigan, in St. Clair 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.