ZIP Code 21133

21133 is one of Maryland's ZIP codes, delivering to addresses in Randallstown, Baltimore County.

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

Where this code sits

21133 is part of the 211xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Randallstown.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21133 delivers to without sharing its boundary.

ZIP codes nearest 21133

The ZIP codes whose reference points sit closest to 21133.
ZIP code	Distance	Delivers to
ZIP code 21163	3.0 mi	Woodstock, MD
ZIP code 21244	3.0 mi	Windsor Mill, MD
ZIP code 21208	3.8 mi	Pikesville, MD
ZIP code 21117	3.8 mi	Owings Mills, MD
ZIP code 21282	4.2 mi	Pikesville, MD
ZIP code 21207	4.7 mi	Gwynn Oak, MD
ZIP code 21153	5.3 mi	Stevenson, MD
ZIP code 21136	5.9 mi	Reisterstown, 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 21133, plotted from its record coordinates.

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

Scope ZIP code 21133. 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.