ZIP prefix directory
21xxxZIP prefix 21 — Places & codes
These 380 ZIP codes share the opening digits 21. Follow the smaller groups or open a code to explore its city, county and postal location.
Open the full directory ↓380ZIP codes
- Recorded ZIP range
- 21001–21930
- Associated states & postal regions
- 1
Not every number in this interval is assigned. These groups describe postal numbers, not state borders or official delivery boundaries. Counts follow the primary place listed for each ZIP in the current directory.
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Associated states & postal regions
21xxx · ZIP codes
Page 2 / 7ZIP codes organize mail delivery, not administrative boundaries. A code can have several city or county associations. Coordinates are approximate; verify delivery addresses with your carrier.