Postal code 21821 is mapped to 1 locality record in United States with administrative hierarchy and coordinates.
Based on 1 records, 1 postal code values and 1 mapped localities. Coordinate coverage is 100.0%.
| Postal code | Locality | Administrative path | Coordinates |
|---|---|---|---|
| 21821 | Deal Island | Maryland / Somerset | 38.1533, -75.9496 |
Use this page to validate one postal code or locality against real parent areas, nearby records and downloadable source rows. The canonical route for this record set is /postal-codes/united-states/code/21821.
| Code | Place | Hierarchy |
|---|---|---|
| 21821 | Deal Island | Maryland / Somerset |
Validate the postal identifier together with country, locality and administrative hierarchy fields, not as a standalone global pattern.
The page includes the parent country, related prefix or nearby codes, coordinates when available and source rows for download/API workflows.
This code belongs to the 21 prefix range for United States.
View all 21 postal codesTreat 21821 as a text value, not a number. Postal identifiers can contain leading zeroes, spaces or letters in other countries, so applications should validate the country and original string together. For this page, the code is valid when it appears with one of the mapped localities below and the administrative path belongs to United States.
A postal code can map to more than one locality record, and the same locality name can appear in different administrative areas. Always compare the country, postal code, place name and region together before treating a match as final.
Coordinates on this page are useful for map previews and approximate area checks. They should be read as locality or postal-area centroids, not as exact delivery addresses. For bulk validation, download the country dataset and keep this canonical URL as the human-readable reference for the code.
These neighboring identifiers help compare adjacent code ranges inside United States. Each link opens a canonical postal-code page with its mapped places and administrative context.