ZIP Code 21030

21030 is one of Maryland's ZIP codes, delivering to addresses in Cockeysville, Baltimore County.

City: Cockeysville
County: Baltimore County
State: Maryland
Prefix: 210xx

Where this code sits

21030 is part of the 210xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Cockeysville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21030 delivers to without sharing its boundary.

ZIP codes nearest 21030

The ZIP codes whose reference points sit closest to 21030.
ZIP code	Distance	Delivers to
ZIP code 21065	0.8 mi	Hunt Valley, MD
ZIP code 21031	1.0 mi	Hunt Valley, MD
ZIP code 21152	4.0 mi	Sparks Glencoe, MD
ZIP code 21093	4.1 mi	Lutherville Timonium, MD
ZIP code 21131	4.8 mi	Phoenix, MD
ZIP code 21023	4.9 mi	Butler, MD
ZIP code 21094	5.4 mi	Lutherville Timonium, MD
ZIP code 21251	5.4 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 21030, plotted from its record coordinates.

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

Scope ZIP code 21030. 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.