ZIP Code 63373

63373 is one of Missouri's ZIP codes, delivering to addresses in Portage Des Sioux, St. Charles County.

City: Portage Des Sioux
County: St. Charles County
State: Missouri
Prefix: 633xx

Where this code sits

63373 is part of the 633xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Portage Des Sioux.

Portage Des Sioux Missouri ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63373 delivers to without sharing its boundary.

636 Area code 636

ZIP codes nearest 63373

The ZIP codes whose reference points sit closest to 63373.
ZIP code	Distance	Delivers to
ZIP code 62028	2.9 mi	Elsah, IL
ZIP code 62037	5.8 mi	Grafton, IL
ZIP code 63034	8.1 mi	Florissant, MO
ZIP code 63031	8.6 mi	Florissant, MO
ZIP code 62022	8.6 mi	Dow, IL
ZIP code 63386	8.7 mi	West Alton, MO
ZIP code 62036	9.6 mi	Golden Eagle, IL
ZIP code 62035	9.8 mi	Godfrey, IL

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 63373, plotted from its record coordinates.

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

Scope ZIP code 63373. 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.