ZIP Code 21012

21012 is one of Maryland's ZIP codes, delivering to addresses in Arnold, Anne Arundel County.

City: Arnold
County: Anne Arundel County
State: Maryland
Prefix: 210xx

Where this code sits

21012 is part of the 210xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Arnold.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21012 delivers to without sharing its boundary.

ZIP codes nearest 21012

The ZIP codes whose reference points sit closest to 21012.
ZIP code	Distance	Delivers to
ZIP code 21409	3.1 mi	Annapolis, MD
ZIP code 21405	3.3 mi	Annapolis, MD
ZIP code 21056	3.8 mi	Gibson Island, MD
ZIP code 21146	4.1 mi	Severna Park, MD
ZIP code 21402	4.4 mi	Annapolis, MD
ZIP code 21404	4.8 mi	Annapolis, MD
ZIP code 21401	5.0 mi	Annapolis, MD
ZIP code 21122	5.0 mi	Pasadena, 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 21012, plotted from its record coordinates.

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

Scope ZIP code 21012. 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.