ZIP Code 21237

21237 is one of Maryland's ZIP codes, delivering to addresses in Rosedale, Baltimore County.

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

Where this code sits

21237 is part of the 212xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Rosedale.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21237 delivers to without sharing its boundary.

ZIP codes nearest 21237

The ZIP codes whose reference points sit closest to 21237.
ZIP code	Distance	Delivers to
ZIP code 21206	2.1 mi	Baltimore, MD
ZIP code 21221	3.2 mi	Essex, MD
ZIP code 21214	3.5 mi	Baltimore, MD
ZIP code 21236	3.9 mi	Nottingham, MD
ZIP code 21234	4.2 mi	Parkville, MD
ZIP code 21224	4.5 mi	Baltimore, MD
ZIP code 21213	4.6 mi	Baltimore, MD
ZIP code 21220	4.6 mi	Middle River, 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 21237, plotted from its record coordinates.

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

Scope ZIP code 21237. 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.