21056 ZIP Code: Living in Gibson Island, MD

Updated November 2026 · Data: U.S. Census Bureau, American Community Survey 2020–2024

ZIP code 21056 is in Anne Arundel County, Maryland, and covers Gibson Island. A private, gated island community at the mouth of the Magothy River with a members-only club and limited home sales each year. About 291 people live in the 21056 ZIP code area.

21056 at a glance

Figures are Census estimates for ZIP Code Tabulation Area 21056, which closely follows the postal ZIP code. This area has few residents, so housing estimates are not shown because they would be unreliable.

Neighborhoods and communities in 21056

The 21056 ZIP code includes Gibson Island. ZIP code lines don’t always match neighborhood or school boundaries, so confirm the details for any specific address.

Commuting from 21056

Here is how far the center of the 21056 ZIP code is from major job centers and travel hubs. These are straight-line distances; drive times depend on route and traffic.

Living in Anne Arundel County: what to know

Annapolis is the county’s only incorporated city and has its own city taxes and services; the rest of Anne Arundel is governed by the county. With more than 500 miles of shoreline, many homes here are waterfront or water-privileged, which can bring critical area rules, pier permits and flood insurance questions.

Public schools in 21056 are run by Anne Arundel County Public Schools. Assignments go by street address, not ZIP code, so use the district’s school locator for a specific home. To compare schools, see the Maryland State Department of Education Report Card.

For taxes, commuting and lifestyle across the county, read our Anne Arundel County relocation guide. For parks and trails, see Anne Arundel County parks.

ZIP codes near 21056

• 21122 – Pasadena
• 21012 – Arnold
• 21409 – Annapolis
• 21146 – Severna Park
• 21401 – Annapolis
• 21032 – Crownsville

21056 ZIP code: frequently asked questions

Sources: U.S. Census Bureau, American Community Survey 5-year estimates 2020–2024 (tables DP03, DP04, DP05) for ZCTA 21056; U.S. Census Bureau TIGERweb ZCTA boundaries. Distances are calculated from the ZCTA’s internal point.