ZIP Code 99371 — Washtucna, WA
99371 is a standard (street delivery) ZIP code serving Washtucna, Washington, in Adams 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 99371 at a glance
| ZIP code | 99371 |
|---|---|
| Primary city | Washtucna |
| State | Washington (WA) |
| County | Adams FIPS 53001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 394 |
| Coordinates | 46.791440, -118.306140 |
How ZIP+4 works in 99371
The four digits after the hyphen encode a delivery segment inside 99371. 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 99371 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 99371.
| ZIP | City | Distance |
|---|---|---|
| 99333 | Hooper, WA | 10.5 mi |
| 99335 | Kahlotus, WA | 12.4 mi |
| 99105 | Benge, WA | 13.8 mi |
| 99341 | Lind, WA | 17.8 mi |
| 99136 | Hay, WA | 18.7 mi |
| 99359 | Starbuck, WA | 19.2 mi |
| 99143 | Lacrosse, WA | 21.4 mi |
| 99169 | Ritzville, WA | 22.8 mi |
| 99326 | Connell, WA | 26.5 mi |
| 99125 | Endicott, WA | 27 mi |
| 99348 | Prescott, WA | 28.7 mi |
| 99017 | Lamont, WA | 33.8 mi |
Questions about 99371
What is the ZIP+4 code for 99371?
99371 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 99371, you need to look up a specific street address to get them.
What city is 99371?
99371 is assigned to Washtucna, Washington, in Adams 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.