ZIP Code 98537 — Cosmopolis, WA
98537 is a standard (street delivery) ZIP code serving Cosmopolis, Washington, in Grays Harbor 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 98537 at a glance
| ZIP code | 98537 |
|---|---|
| Primary city | Cosmopolis |
| State | Washington (WA) |
| County | Grays Harbor FIPS 53027 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 2,820 |
| Coordinates | 46.817190, -123.597680 |
How ZIP+4 works in 98537
The four digits after the hyphen encode a delivery segment inside 98537. 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 98537 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 98537.
| ZIP | City | Distance |
|---|---|---|
| 98577 | Raymond, WA | 12.1 mi |
| 98583 | Satsop, WA | 13.7 mi |
| 98568 | Oakville, WA | 14.3 mi |
| 98520 | Aberdeen, WA | 15.8 mi |
| 98559 | Malone, WA | 16.1 mi |
| 98541 | Elma, WA | 19.6 mi |
| 98539 | Doty, WA | 19.7 mi |
| 98547 | Grayland, WA | 20 mi |
| 98590 | Tokeland, WA | 20.3 mi |
| 98586 | South Bend, WA | 21.1 mi |
| 98527 | Bay Center, WA | 21.5 mi |
| 98557 | Mccleary, WA | 22 mi |
Questions about 98537
What is the ZIP+4 code for 98537?
98537 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 98537, you need to look up a specific street address to get them.
What city is 98537?
98537 is assigned to Cosmopolis, Washington, in Grays Harbor 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.