ZIP Code 99020

99020 is one of Washington's ZIP codes, delivering to addresses in Marshall, Spokane County.

City: Marshall
County: Spokane County
State: Washington
Prefix: 990xx

Where this code sits

99020 is part of the 990xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Marshall.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99020 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99020

The ZIP codes whose reference points sit closest to 99020.
ZIP code	Distance	Delivers to
ZIP code 99014	4.5 mi	Four Lakes, WA
ZIP code 99224	5.0 mi	Spokane, WA
ZIP code 99004	6.3 mi	Cheney, WA
ZIP code 99203	6.3 mi	Spokane, WA
ZIP code 99204	6.7 mi	Spokane, WA
ZIP code 99210	6.9 mi	Spokane, WA
ZIP code 99211	6.9 mi	Spokane, WA
ZIP code 99214	6.9 mi	Spokane, WA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 99020, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 99020. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.