ZIP Code 21128

21128 is one of Maryland's ZIP codes, delivering to addresses in Perry Hall, Baltimore County.

City: Perry Hall
County: Baltimore County
State: Maryland
Prefix: 211xx

Where this code sits

21128 is part of the 211xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Perry Hall.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21128 delivers to without sharing its boundary.

ZIP codes nearest 21128

The ZIP codes whose reference points sit closest to 21128.
ZIP code	Distance	Delivers to
ZIP code 21236	2.0 mi	Nottingham, MD
ZIP code 21162	2.1 mi	White Marsh, MD
ZIP code 21156	3.8 mi	Upper Falls, MD
ZIP code 21087	4.3 mi	Kingsville, MD
ZIP code 21220	4.6 mi	Middle River, MD
ZIP code 21234	4.9 mi	Parkville, MD
ZIP code 21051	5.0 mi	Fork, MD
ZIP code 21027	5.0 mi	Chase, 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 21128, plotted from its record coordinates.

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

Scope ZIP code 21128. 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.