ZIP Code 99363 — Wallula, WA
99363 is a standard (street delivery) ZIP code serving Wallula, Washington, in Walla Walla 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 99363 at a glance
| ZIP code | 99363 |
|---|---|
| Primary city | Wallula |
| State | Washington (WA) |
| County | Walla Walla FIPS 53071 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 145 |
| Coordinates | 46.048210, -118.895750 |
How ZIP+4 works in 99363
The four digits after the hyphen encode a delivery segment inside 99363. 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 99363 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 99363.
| ZIP | City | Distance |
|---|---|---|
| 99337 | Kennewick, WA | 9.4 mi |
| 99323 | Burbank, WA | 9.8 mi |
| 99360 | Touchet, WA | 11.3 mi |
| 97835 | Helix, OR | 11.9 mi |
| 99336 | Kennewick, WA | 17.7 mi |
| 99346 | Plymouth, WA | 19.7 mi |
| 99338 | Kennewick, WA | 20.1 mi |
| 97875 | Stanfield, OR | 20.2 mi |
| 97813 | Athena, OR | 22.2 mi |
| 99352 | Richland, WA | 23.2 mi |
| 97838 | Hermiston, OR | 23.2 mi |
| 97882 | Umatilla, OR | 23.8 mi |
Questions about 99363
What is the ZIP+4 code for 99363?
99363 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 99363, you need to look up a specific street address to get them.
What city is 99363?
99363 is assigned to Wallula, Washington, in Walla Walla 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.