ZIP Code 98010 — Black Diamond, WA
98010 is a standard (street delivery) ZIP code serving Black Diamond, 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 98010 at a glance
| ZIP code | 98010 |
|---|---|
| Primary city | Black Diamond |
| State | Washington (WA) |
| County | King FIPS 53033 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 6,857 |
| Coordinates | 47.311730, -122.003260 |
How ZIP+4 works in 98010
The four digits after the hyphen encode a delivery segment inside 98010. 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 98010 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 98010.
| ZIP | City | Distance |
|---|---|---|
| 98051 | Ravensdale, WA | 5.6 mi |
| 98092 | Auburn, WA | 6.2 mi |
| 98042 | Kent, WA | 6.4 mi |
| 98038 | Maple Valley, WA | 7.7 mi |
| 98025 | Hobart, WA | 8.8 mi |
| 98030 | Kent, WA | 9.9 mi |
| 98002 | Auburn, WA | 9.9 mi |
| 98058 | Renton, WA | 10.6 mi |
| 98031 | Kent, WA | 11 mi |
| 98321 | Buckley, WA | 11.2 mi |
| 98047 | Pacific, WA | 12 mi |
| 98001 | Auburn, WA | 12.2 mi |
Questions about 98010
What is the ZIP+4 code for 98010?
98010 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 98010, you need to look up a specific street address to get them.
What city is 98010?
98010 is assigned to Black Diamond, 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.