ZIP Code 63346

63346 is one of Missouri's ZIP codes, delivering to addresses in Flinthill, St. Charles County.

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

Where this code sits

63346 is part of the 633xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Flinthill.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63346 delivers to without sharing its boundary.

ZIP codes nearest 63346

The ZIP codes whose reference points sit closest to 63346.
ZIP code	Distance	Delivers to
ZIP code 63303	1.0 mi	Saint Charles, MO
ZIP code 63302	3.8 mi	Saint Charles, MO
ZIP code 63301	3.9 mi	Saint Charles, MO
ZIP code 63045	4.0 mi	Earth City, MO
ZIP code 63304	4.8 mi	Saint Charles, MO
ZIP code 63376	5.1 mi	Saint Peters, MO
ZIP code 63043	5.2 mi	Maryland Heights, MO
ZIP code 63146	5.2 mi	Saint Louis, 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 63346, plotted from its record coordinates.

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

Scope ZIP code 63346. 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.