ZIP Code 21120

21120 is one of Maryland's ZIP codes, delivering to addresses in Parkton, Baltimore County.

City: Parkton
County: Baltimore County
State: Maryland
Prefix: 211xx

Where this code sits

21120 is part of the 211xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Parkton.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21120 delivers to without sharing its boundary.

ZIP codes nearest 21120

The ZIP codes whose reference points sit closest to 21120.
ZIP code	Distance	Delivers to
ZIP code 21053	4.4 mi	Freeland, MD
ZIP code 21105	4.8 mi	Maryland Line, MD
ZIP code 21161	5.9 mi	White Hall, MD
ZIP code 21152	6.5 mi	Sparks Glencoe, MD
ZIP code 21111	6.6 mi	Monkton, MD
ZIP code 17349	6.9 mi	New Freedom, PA
ZIP code 17355	8.1 mi	Railroad, PA
ZIP code 17361	8.1 mi	Shrewsbury, PA

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 21120, plotted from its record coordinates.

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

Scope ZIP code 21120. 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.