ZIP Code 98528 — Belfair, WA
98528 is a standard (street delivery) ZIP code serving Belfair, Washington, in Mason 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 98528 at a glance
| ZIP code | 98528 |
|---|---|
| Primary city | Belfair |
| State | Washington (WA) |
| County | Mason FIPS 53045 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 11,940 |
| Coordinates | 47.446050, -122.896180 |
How ZIP+4 works in 98528
The four digits after the hyphen encode a delivery segment inside 98528. 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 98528 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 98528.
| ZIP | City | Distance |
|---|---|---|
| 98588 | Tahuya, WA | 5.9 mi |
| 98524 | Allyn, WA | 5.9 mi |
| 98546 | Grapeview, WA | 8.5 mi |
| 98380 | Seabeck, WA | 8.9 mi |
| 98329 | Gig Harbor, WA | 9.3 mi |
| 98367 | Port Orchard, WA | 10.3 mi |
| 98394 | Vaughn, WA | 10.3 mi |
| 98555 | Lilliwaup, WA | 10.4 mi |
| 98312 | Bremerton, WA | 10.4 mi |
| 98592 | Union, WA | 11.8 mi |
| 98349 | Lakebay, WA | 13.7 mi |
| 98314 | Bremerton, WA | 14.4 mi |
Questions about 98528
What is the ZIP+4 code for 98528?
98528 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 98528, you need to look up a specific street address to get them.
What city is 98528?
98528 is assigned to Belfair, Washington, in Mason 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.