ZIP Code 48079 — Saint Clair, MI
48079 is a standard (street delivery) ZIP code serving Saint Clair, 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 48079 at a glance
| ZIP code | 48079 |
|---|---|
| Primary city | Saint Clair |
| State | Michigan (MI) |
| County | St. Clair FIPS 26147 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 12,711 |
| Coordinates | 42.857600, -82.547210 |
How ZIP+4 works in 48079
The four digits after the hyphen encode a delivery segment inside 48079. 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 48079 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 48079.
| ZIP | City | Distance |
|---|---|---|
| 48040 | Marysville, MI | 4.9 mi |
| 48054 | East China, MI | 6 mi |
| 48074 | Smiths Creek, MI | 6.3 mi |
| 48063 | Columbus, MI | 6.6 mi |
| 48064 | Casco, MI | 8.9 mi |
| 48027 | Goodells, MI | 9.1 mi |
| 48060 | Port Huron, MI | 9.4 mi |
| 48039 | Marine City, MI | 11.1 mi |
| 48023 | Fair Haven, MI | 12.2 mi |
| 48049 | North Street, MI | 12.4 mi |
| 48062 | Richmond, MI | 12.8 mi |
| 48050 | New Haven, MI | 13.8 mi |
Questions about 48079
What is the ZIP+4 code for 48079?
48079 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 48079, you need to look up a specific street address to get them.
What city is 48079?
48079 is assigned to Saint Clair, 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.