ZIP Code 99203 — Spokane, WA
99203 is a standard (street delivery) ZIP code serving Spokane, Washington, in Spokane 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 99203 at a glance
| ZIP code | 99203 |
|---|---|
| Primary city | Spokane |
| State | Washington (WA) |
| County | Spokane FIPS 53063 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 21,468 |
| Coordinates | 47.629450, -117.402910 |
How ZIP+4 works in 99203
The four digits after the hyphen encode a delivery segment inside 99203. 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 99203 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.
Other ZIP codes in Spokane
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 99203.
| ZIP | City | Distance |
|---|---|---|
| 99204 | Spokane, WA | 1.7 mi |
| 99202 | Spokane, WA | 2.2 mi |
| 99258 | Spokane, WA | 2.5 mi |
| 99201 | Spokane, WA | 2.8 mi |
| 99207 | Spokane, WA | 4.2 mi |
| 99223 | Spokane, WA | 4.3 mi |
| 99205 | Spokane, WA | 5 mi |
| 99212 | Spokane, WA | 5 mi |
| 99020 | Marshall, WA | 6.3 mi |
| 99224 | Spokane, WA | 6.3 mi |
| 99206 | Spokane, WA | 6.9 mi |
| 99001 | Airway Heights, WA | 8.5 mi |
Questions about 99203
What is the ZIP+4 code for 99203?
99203 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 99203, you need to look up a specific street address to get them.
What city is 99203?
99203 is assigned to Spokane, Washington, in Spokane 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.