ZIP Code 21220

21220 is one of Maryland's ZIP codes, delivering to addresses in Middle River, Baltimore County.

City: Middle River
County: Baltimore County
State: Maryland
Prefix: 212xx

Where this code sits

21220 is part of the 212xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Middle River.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21220 delivers to without sharing its boundary.

ZIP codes nearest 21220

The ZIP codes whose reference points sit closest to 21220.
ZIP code	Distance	Delivers to
ZIP code 21027	2.9 mi	Chase, MD
ZIP code 21221	3.0 mi	Essex, MD
ZIP code 21162	3.6 mi	White Marsh, MD
ZIP code 21237	4.6 mi	Rosedale, MD
ZIP code 21128	4.6 mi	Perry Hall, MD
ZIP code 21236	5.2 mi	Nottingham, MD
ZIP code 21222	6.6 mi	Dundalk, MD
ZIP code 21085	6.7 mi	Joppa, 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 21220, plotted from its record coordinates.

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

Scope ZIP code 21220. 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.