ZIP Code 98038 — Maple Valley, WA
98038 is a standard (street delivery) ZIP code serving Maple Valley, Washington, in King 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 98038 at a glance
| ZIP code | 98038 |
|---|---|
| Primary city | Maple Valley |
| State | Washington (WA) |
| County | King FIPS 53033 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 37,324 |
| Coordinates | 47.418610, -121.955890 |
How ZIP+4 works in 98038
The four digits after the hyphen encode a delivery segment inside 98038. 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 98038 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 98038.
| ZIP | City | Distance |
|---|---|---|
| 98025 | Hobart, WA | 1.1 mi |
| 98051 | Ravensdale, WA | 6.2 mi |
| 98027 | Issaquah, WA | 6.3 mi |
| 98010 | Black Diamond, WA | 7.7 mi |
| 98058 | Renton, WA | 8 mi |
| 98042 | Kent, WA | 8.3 mi |
| 98050 | Preston, WA | 8.9 mi |
| 98059 | Renton, WA | 9.5 mi |
| 98029 | Issaquah, WA | 9.9 mi |
| 98024 | Fall City, WA | 10.9 mi |
| 98031 | Kent, WA | 11.2 mi |
| 98055 | Renton, WA | 11.7 mi |
Questions about 98038
What is the ZIP+4 code for 98038?
98038 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 98038, you need to look up a specific street address to get them.
What city is 98038?
98038 is assigned to Maple Valley, Washington, in King 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.