ZIP Code 21131

21131 is one of Maryland's ZIP codes, delivering to addresses in Phoenix, Baltimore County.

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

Where this code sits

21131 is part of the 211xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Phoenix.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21131 delivers to without sharing its boundary.

ZIP codes nearest 21131

The ZIP codes whose reference points sit closest to 21131.
ZIP code	Distance	Delivers to
ZIP code 21092	3.0 mi	Long Green, MD
ZIP code 21094	3.2 mi	Lutherville Timonium, MD
ZIP code 21251	3.2 mi	Baltimore, MD
ZIP code 21057	3.8 mi	Glen Arm, MD
ZIP code 21065	4.1 mi	Hunt Valley, MD
ZIP code 21031	4.1 mi	Hunt Valley, MD
ZIP code 21286	4.8 mi	Towson, MD
ZIP code 21030	4.8 mi	Cockeysville, 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 21131, plotted from its record coordinates.

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

Scope ZIP code 21131. 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.