ZIP Code 99171 — Saint John, WA
99171 is a standard (street delivery) ZIP code serving Saint John, Washington, in Whitman 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 99171 at a glance
| ZIP code | 99171 |
|---|---|
| Primary city | Saint John |
| State | Washington (WA) |
| County | Whitman FIPS 53075 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 895 |
| Coordinates | 47.104850, -117.649500 |
How ZIP+4 works in 99171
The four digits after the hyphen encode a delivery segment inside 99171. 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 99171 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 99171.
| ZIP | City | Distance |
|---|---|---|
| 99176 | Thornton, WA | 11.2 mi |
| 99149 | Malden, WA | 11.9 mi |
| 99017 | Lamont, WA | 11.9 mi |
| 99125 | Endicott, WA | 12.3 mi |
| 99174 | Steptoe, WA | 15.3 mi |
| 99170 | Rosalia, WA | 15.4 mi |
| 99158 | Oakesdale, WA | 19.3 mi |
| 99111 | Colfax, WA | 19.4 mi |
| 99004 | Cheney, WA | 21 mi |
| 99130 | Garfield, WA | 23 mi |
| 99032 | Sprague, WA | 24 mi |
| 99105 | Benge, WA | 24 mi |
Questions about 99171
What is the ZIP+4 code for 99171?
99171 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 99171, you need to look up a specific street address to get them.
What city is 99171?
99171 is assigned to Saint John, Washington, in Whitman 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.