ZIP Code 63090

63090 is one of Missouri's ZIP codes, delivering to addresses in Washington, Franklin County.

City: Washington
County: Franklin County
State: Missouri
Prefix: 630xx

Where this code sits

63090 is part of the 630xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Washington.

Washington Missouri ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63090 delivers to without sharing its boundary.

636 Area code 636

ZIP codes nearest 63090

The ZIP codes whose reference points sit closest to 63090.
ZIP code	Distance	Delivers to
ZIP code 63342	4.3 mi	Dutzow, MO
ZIP code 63084	6.9 mi	Union, MO
ZIP code 63332	7.7 mi	Augusta, MO
ZIP code 63055	7.9 mi	Labadie, MO
ZIP code 63089	9.5 mi	Villa Ridge, MO
ZIP code 63357	10 mi	Marthasville, MO
ZIP code 63039	11 mi	Gray Summit, MO
ZIP code 63378	11 mi	Treloar, MO

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 63090, plotted from its record coordinates.

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

Scope ZIP code 63090. 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.