ZIP Code 63378

63378 is one of Missouri's ZIP codes, delivering to addresses in Treloar, Warren County.

City: Treloar
County: Warren County
State: Missouri
Prefix: 633xx

Where this code sits

63378 is part of the 633xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Treloar.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63378 delivers to without sharing its boundary.

636 Area code 636

ZIP codes nearest 63378

The ZIP codes whose reference points sit closest to 63378.
ZIP code	Distance	Delivers to
ZIP code 63357	2.0 mi	Marthasville, MO
ZIP code 63068	5.4 mi	New Haven, MO
ZIP code 63014	8.1 mi	Berger, MO
ZIP code 63342	11 mi	Dutzow, MO
ZIP code 63383	11 mi	Warrenton, MO
ZIP code 63090	11 mi	Washington, MO
ZIP code 63380	12 mi	Truesdale, MO
ZIP code 63056	13 mi	Leslie, 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 63378, plotted from its record coordinates.

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

Scope ZIP code 63378. 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.