ZIP Code 98592 — Union, WA
98592 is a standard (street delivery) ZIP code serving Union, 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 98592 at a glance
| ZIP code | 98592 |
|---|---|
| Primary city | Union |
| State | Washington (WA) |
| County | Mason FIPS 53045 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 2,059 |
| Coordinates | 47.328950, -123.079070 |
How ZIP+4 works in 98592
The four digits after the hyphen encode a delivery segment inside 98592. 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 98592 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 98592.
| ZIP | City | Distance |
|---|---|---|
| 98584 | Shelton, WA | 6.9 mi |
| 98546 | Grapeview, WA | 7.3 mi |
| 98588 | Tahuya, WA | 7.8 mi |
| 98524 | Allyn, WA | 11.2 mi |
| 98528 | Belfair, WA | 11.8 mi |
| 98548 | Hoodsport, WA | 14 mi |
| 98394 | Vaughn, WA | 14.1 mi |
| 98349 | Lakebay, WA | 14.9 mi |
| 98555 | Lilliwaup, WA | 15 mi |
| 98329 | Gig Harbor, WA | 16.9 mi |
| 98560 | Matlock, WA | 16.9 mi |
| 98351 | Longbranch, WA | 16.9 mi |
Questions about 98592
What is the ZIP+4 code for 98592?
98592 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 98592, you need to look up a specific street address to get them.
What city is 98592?
98592 is assigned to Union, 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.