99115 ZIP Code: Coulee City, Washington
ZIP code 99115 covers Coulee City, Washington. It sits in Grant County. A ZIP code is a US Postal Service mail route, not a boundary on a map, so it describes where post is delivered rather than an administrative area.
| ZIP code | 99115 |
|---|---|
| Place | Coulee City |
| State | Washington (WA) |
| County or equivalent | Grant County |
| Phone area codes in Washington | 6 |
| Country | United States |
ZIP codes near 99115
- 99135 Hartlineabout 9 miles
- 98860 Wilson Creekabout 9 miles
- 98853 Stratfordabout 12 miles
- 98851 Soap Lakeabout 18 miles
- 99103 Almiraabout 20 miles
- 98830 Mansfieldabout 22 miles
- 98832 Marlinabout 23 miles
- 99123 Electric Cityabout 24 miles
Distances are straight-line, between the approximate centres of each delivery area.
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Frequently asked questions
Where is ZIP code 99115?
ZIP code 99115 is in Coulee City, Washington, in Grant County. ZIP codes are mail delivery routes rather than mapped regions, so the code identifies a set of addresses the Postal Service serves together, not a district with fixed borders.
What county is 99115 in?
99115 is in Grant County, Washington. A single ZIP code can straddle a county line, because mail routes were drawn for delivery efficiency and take no notice of county boundaries, so the county shown is the one the code is primarily associated with.
What area code goes with ZIP code 99115?
ZIP codes and telephone area codes are separate systems with different boundaries, so no ZIP code maps to exactly one area code. Washington uses 6 geographic area codes: 206, 253, 360, 425, 509 and 564.
Is 99115 a real ZIP code?
Yes. 99115 appears in the GeoNames postal-code dataset as an active US code assigned to Coulee City, Washington. Codes that have been retired or never issued do not appear, which is why entering one on this site returns a not-found page rather than a blank record.
Why do ZIP code boundaries look odd on maps?
Because they are not boundaries. A ZIP code is a collection of mail routes, and a route is a line a carrier walks or drives, not an area. Any ZIP code map you have seen is somebody's approximation drawn around the addresses in a code, which is also why two ZIP code maps rarely agree with each other.
Can two addresses in the same ZIP code be in different cities?
Yes, routinely. The Postal Service assigns a preferred city name to each code for addressing purposes, and that name often covers several neighbouring towns, unincorporated areas or a whole postal district. The place shown here is the one the source names for the code, not a claim that every address in it is inside that town's limits.
ZIP code, place, county and location data from GeoNames, used under CC BY 4.0, extracted 2026-08-22. ZIP codes are Postal Service delivery routes, not administrative areas, so a code can cross city and county lines and the place name shown is the one the source records for the code. Coordinates are an approximate centre of the delivery area, not a precise location. Population and time zone are not shown because the source does not publish them.