ZIP code 21056
Where is ZIP code 21056?
Gibson Island, Maryland
Anne Arundel County · PO Box only ZIP code
ZIP code 21056 belongs to Gibson Island, Maryland in Anne Arundel County. 21056 is a PO Box only ZIP code: it is used for post office boxes at the Gibson Island post office, not for street addresses. It is in the Eastern Time zone and uses area codes 410, 443 and 667. About 291 people live in the 21056 area, where the median household income is $250,001. The closest ZIP codes are 21409 (Annapolis, 2.3 mi south), 21012 (Arnold, 3.8 mi southwest) and 21122 (Pasadena, 4.6 mi northwest).
| ZIP code | 21056 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Gibson Island |
| State | Maryland (MD) |
| County | Anne Arundel County |
| Time zone | Eastern Time · now |
| Area codes | 410, 443, 667 |
| Coordinates | 39.0751, -76.4324 map |
| 3-digit prefix | 210 |
Population and income in 21056
| Population | 291 · lower than 88% of Maryland ZIP codes |
|---|---|
| People per square mile | 211 · lower than 64% of Maryland ZIP codes |
| Median age | 66.6 years · higher than 97% of Maryland ZIP codes |
| Men / women | 46% / 54% |
| Median household income | $250,001 · higher than 99% of Maryland ZIP codes |
| Income per person | $214,716 |
| Below the poverty line | 0.0% |
| Bachelor’s degree or higher | 93% of adults 25+ |
| Median home value | $2,000,001 · higher than 100% of Maryland ZIP codes |
| Housing units | 306 |
| Households | 145 (2.01 people on average) |
| Owners / renters | 100% / 0.0% |
| Land area | 1.38 sq mi (plus 0.25 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 21056. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 21056
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 21409 | Annapolis, MD | 2.3 mi S | Standard |
| 21012 | Arnold, MD | 3.8 mi SW | Standard |
| 21122 | Pasadena, MD | 4.6 mi NW | Standard |
| 21402 | Annapolis, MD | 6.4 mi S | Standard |
| 21146 | Severna Park, MD | 6.7 mi W | Standard |
| 21405 | Annapolis, MD | 7.1 mi SW | Standard |
| 21404 | Annapolis, MD | 7.4 mi SW | PO Box only |
| 21401 | Annapolis, MD | 8.6 mi SW | Standard |
| 21032 | Crownsville, MD | 8.8 mi W | Standard |
| 21403 | Annapolis, MD | 9 mi S | Standard |
| 21052 | Fort Howard, MD | 9.1 mi N | PO Box only |
| 21108 | Millersville, MD | 10.2 mi W | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 21056 or measure the distance to another ZIP code.
How to address mail to 21056
PO BOX 123
GIBSON ISLAND MD 21056
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (21056-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 21056?
- 21056 is a Gibson Island, Maryland ZIP code.
- What county is 21056 in?
- ZIP code 21056 is in Anne Arundel County, Maryland.
- What time zone is ZIP code 21056 in?
- 21056 is in the Eastern Time zone (America/New_York).
- What area code is 21056?
- Phone numbers in ZIP code 21056 use area codes 410, 443 and 667.
- What is the population of ZIP code 21056?
- About 291 people live in ZIP code 21056, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 21056?
- The median household income in 21056 is $250,001 a year, higher than 99% of Maryland ZIP codes.
- Can I use 21056 for a street address?
- No. 21056 is only for PO Boxes. Street addresses in Gibson Island use another ZIP code.
- What ZIP codes are near 21056?
- The nearest ZIP codes to 21056 are 21409 (Annapolis, 2.3 miles), 21012 (Arnold, 3.8 miles), 21122 (Pasadena, 4.6 miles) and 21402 (Annapolis, 6.4 miles).