ZIP Code 63021

63021 is one of Missouri's ZIP codes, delivering to addresses in Ballwin, St. Louis County.

City: Ballwin
County: St. Louis County
State: Missouri
Prefix: 630xx

Where this code sits

63021 is part of the 630xx range, the group of codes handled by one mail processing centre. Ballwin is served by 4 ZIP codes in total; the full list, with the county each falls in, is on the Ballwin page.

Ballwin Missouri ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 63021 delivers to without sharing its boundary.

ZIP codes nearest 63021

The ZIP codes whose reference points sit closest to 63021.
ZIP code	Distance	Delivers to
ZIP code 63022	1.7 mi	Ballwin, MO
ZIP code 63024	1.7 mi	Ballwin, MO
ZIP code 63088	2.2 mi	Valley Park, MO
ZIP code 63011	2.9 mi	Ballwin, MO
ZIP code 63131	4.9 mi	Saint Louis, MO
ZIP code 63017	5.0 mi	Chesterfield, MO
ZIP code 63122	5.4 mi	Saint Louis, MO
ZIP code 63040	5.7 mi	Grover, 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 63021, plotted from its record coordinates.

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

Scope ZIP code 63021. 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.