ZIP Code 99343

99343 is one of Washington's ZIP codes, delivering to addresses in Mesa, Franklin County.

City: Mesa
County: Franklin County
State: Washington
Prefix: 993xx

Where this code sits

99343 is part of the 993xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Mesa.

Mesa Washington ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99343 delivers to without sharing its boundary.

509 Area code 509

ZIP codes nearest 99343

The ZIP codes whose reference points sit closest to 99343.
ZIP code	Distance	Delivers to
ZIP code 99330	7.3 mi	Eltopia, WA
ZIP code 99326	15 mi	Connell, WA
ZIP code 99354	19 mi	Richland, WA
ZIP code 99344	20 mi	Othello, WA
ZIP code 99353	21 mi	West Richland, WA
ZIP code 99301	23 mi	Pasco, WA
ZIP code 99352	24 mi	Richland, WA
ZIP code 99302	24 mi	Pasco, 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 99343, plotted from its record coordinates.

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

Scope ZIP code 99343. 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.