ZIP Code 63341

63341 is one of Missouri's ZIP codes, delivering to addresses in Defiance, St. Charles County.

City: Defiance
County: St. Charles County
State: Missouri
Prefix: 633xx

Where this code sits

63341 is part of the 633xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Defiance.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63341 delivers to without sharing its boundary.

636 Area code 636

ZIP codes nearest 63341

The ZIP codes whose reference points sit closest to 63341.
ZIP code	Distance	Delivers to
ZIP code 63365	4.5 mi	New Melle, MO
ZIP code 63073	6.4 mi	Saint Albans, MO
ZIP code 63332	6.7 mi	Augusta, MO
ZIP code 63368	8.2 mi	O Fallon, MO
ZIP code 63348	9.0 mi	Foristell, MO
ZIP code 63367	9.4 mi	Lake Saint Louis, MO
ZIP code 63342	9.7 mi	Dutzow, MO
ZIP code 63385	9.8 mi	Wentzville, 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 63341, plotted from its record coordinates.

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

Scope ZIP code 63341. 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.