ZIP Code 48390 — Walled Lake, MI
48390 is a standard (street delivery) ZIP code serving Walled Lake, 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 48390 at a glance
| ZIP code | 48390 |
|---|---|
| Primary city | Walled Lake |
| State | Michigan (MI) |
| County | Oakland FIPS 26125 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 23,939 |
| Coordinates | 42.551970, -83.475200 |
How ZIP+4 works in 48390
The four digits after the hyphen encode a delivery segment inside 48390. 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 48390 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 48390.
| ZIP | City | Distance |
|---|---|---|
| 48377 | Novi, MI | 3.1 mi |
| 48382 | Commerce Township, MI | 3.1 mi |
| 48393 | Wixom, MI | 4.1 mi |
| 48331 | Farmington, MI | 4.7 mi |
| 48322 | West Bloomfield, MI | 4.8 mi |
| 48323 | West Bloomfield, MI | 5.2 mi |
| 48324 | West Bloomfield, MI | 5.3 mi |
| 48375 | Novi, MI | 6 mi |
| 48374 | Novi, MI | 6.1 mi |
| 48381 | Milford, MI | 6.1 mi |
| 48334 | Farmington, MI | 7.1 mi |
| 48327 | Waterford, MI | 7.1 mi |
Questions about 48390
What is the ZIP+4 code for 48390?
48390 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 48390, you need to look up a specific street address to get them.
What city is 48390?
48390 is assigned to Walled Lake, 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.