ZIP Code 48340 — Pontiac, MI
48340 is a standard (street delivery) ZIP code serving Pontiac, Michigan, in Oakland 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 48340 at a glance
| ZIP code | 48340 |
|---|---|
| Primary city | Pontiac |
| State | Michigan (MI) |
| County | Oakland FIPS 26125 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 25,669 |
| Coordinates | 42.670650, -83.290190 |
How ZIP+4 works in 48340
The four digits after the hyphen encode a delivery segment inside 48340. 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 48340 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.
Other ZIP codes in Pontiac
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 48340.
| ZIP | City | Distance |
|---|---|---|
| 48326 | Auburn Hills, MI | 1.9 mi |
| 48342 | Pontiac, MI | 2 mi |
| 48341 | Pontiac, MI | 3 mi |
| 48359 | Lake Orion, MI | 3.6 mi |
| 48328 | Waterford, MI | 3.7 mi |
| 48320 | Keego Harbor, MI | 4.7 mi |
| 48329 | Waterford, MI | 5.1 mi |
| 48309 | Rochester, MI | 5.5 mi |
| 48360 | Lake Orion, MI | 5.5 mi |
| 48302 | Bloomfield Hills, MI | 5.9 mi |
| 48304 | Bloomfield Hills, MI | 6.4 mi |
| 48327 | Waterford, MI | 6.5 mi |
Questions about 48340
What is the ZIP+4 code for 48340?
48340 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 48340, you need to look up a specific street address to get them.
What city is 48340?
48340 is assigned to Pontiac, Michigan, in Oakland 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.