ZIP Code 63631

63631 is one of Missouri's ZIP codes, delivering to addresses in Caledonia, Washington County.

City: Caledonia
County: Washington County
State: Missouri
Prefix: 636xx

Where this code sits

63631 is part of the 636xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Caledonia.

Caledonia Missouri ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63631 delivers to without sharing its boundary.

ZIP codes nearest 63631

The ZIP codes whose reference points sit closest to 63631.
ZIP code	Distance	Delivers to
ZIP code 63648	5.1 mi	Irondale, MO
ZIP code 63623	6.5 mi	Belleview, MO
ZIP code 63622	6.8 mi	Belgrade, MO
ZIP code 63624	7.8 mi	Bismarck, MO
ZIP code 63660	11 mi	Mineral Point, MO
ZIP code 63653	11 mi	Leadwood, MO
ZIP code 63663	11 mi	Pilot Knob, MO
ZIP code 63650	13 mi	Ironton, 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 63631, plotted from its record coordinates.

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

Scope ZIP code 63631. 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.