ZIP Code 99350

99350 is one of Washington's ZIP codes, delivering to addresses in Prosser, Benton County.

City: Prosser
County: Benton County
State: Washington
Prefix: 993xx

Where this code sits

99350 is part of the 993xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Prosser.

Prosser Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99350 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99350

The ZIP codes whose reference points sit closest to 99350.
ZIP code	Distance	Delivers to
ZIP code 98930	7.2 mi	Grandview, WA
ZIP code 98935	12 mi	Mabton, WA
ZIP code 98944	13 mi	Sunnyside, WA
ZIP code 99320	14 mi	Benton City, WA
ZIP code 99345	16 mi	Paterson, WA
ZIP code 98938	18 mi	Outlook, WA
ZIP code 99353	20 mi	West Richland, WA
ZIP code 98932	21 mi	Granger, 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 99350, plotted from its record coordinates.

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

Scope ZIP code 99350. 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.