ZIP Code 21056

21056 is one of Maryland's ZIP codes, delivering to addresses in Gibson Island, Anne Arundel County.

City: Gibson Island
County: Anne Arundel County
State: Maryland
Prefix: 210xx

Where this code sits

21056 is part of the 210xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Gibson Island.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21056 delivers to without sharing its boundary.

ZIP codes nearest 21056

The ZIP codes whose reference points sit closest to 21056.
ZIP code	Distance	Delivers to
ZIP code 21409	2.3 mi	Annapolis, MD
ZIP code 21012	3.8 mi	Arnold, MD
ZIP code 21122	4.6 mi	Pasadena, MD
ZIP code 21402	6.4 mi	Annapolis, MD
ZIP code 21146	6.7 mi	Severna Park, MD
ZIP code 21405	7.1 mi	Annapolis, MD
ZIP code 21404	7.4 mi	Annapolis, MD
ZIP code 21401	8.6 mi	Annapolis, 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 21056, plotted from its record coordinates.

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

Scope ZIP code 21056. 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.