ZIP Code 21228

21228 is one of Maryland's ZIP codes, delivering to addresses in Catonsville, Baltimore County.

City: Catonsville
County: Baltimore County
State: Maryland
Prefix: 212xx

Where this code sits

21228 is part of the 212xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Catonsville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21228 delivers to without sharing its boundary.

ZIP codes nearest 21228

The ZIP codes whose reference points sit closest to 21228.
ZIP code	Distance	Delivers to
ZIP code 21250	2.0 mi	Baltimore, MD
ZIP code 21229	2.7 mi	Baltimore, MD
ZIP code 21207	3.6 mi	Gwynn Oak, MD
ZIP code 21043	3.6 mi	Ellicott City, MD
ZIP code 21227	4.0 mi	Halethorpe, MD
ZIP code 21216	4.3 mi	Baltimore, MD
ZIP code 21244	4.5 mi	Windsor Mill, MD
ZIP code 21223	5.0 mi	Baltimore, MD

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 21228, plotted from its record coordinates.

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

Scope ZIP code 21228. 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.