ZIP Code 99001 — Airway Heights, WA
99001 is a standard (street delivery) ZIP code serving Airway Heights, 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 99001 at a glance
| ZIP code | 99001 |
|---|---|
| Primary city | Airway Heights |
| State | Washington (WA) |
| County | Spokane FIPS 53063 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Los_Angeles |
| Population | 9,440 |
| Coordinates | 47.638740, -117.585820 |
How ZIP+4 works in 99001
The four digits after the hyphen encode a delivery segment inside 99001. 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 99001 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 99001.
| ZIP | City | Distance |
|---|---|---|
| 99224 | Spokane, WA | 2.4 mi |
| 99011 | Fairchild Air Force Base, WA | 3.2 mi |
| 99014 | Four Lakes, WA | 5.4 mi |
| 99022 | Medical Lake, WA | 6.3 mi |
| 99020 | Marshall, WA | 6.7 mi |
| 99201 | Spokane, WA | 7.2 mi |
| 99204 | Spokane, WA | 7.4 mi |
| 99205 | Spokane, WA | 7.6 mi |
| 99203 | Spokane, WA | 8.5 mi |
| 99258 | Spokane, WA | 8.7 mi |
| 99202 | Spokane, WA | 9.7 mi |
| 99207 | Spokane, WA | 9.8 mi |
Questions about 99001
What is the ZIP+4 code for 99001?
99001 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 99001, you need to look up a specific street address to get them.
What city is 99001?
99001 is assigned to Airway Heights, 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.