ZIP prefix directory
51xxxZIP prefix 51 — Places & codes
These 217 ZIP codes share the opening digits 51. Follow the smaller groups or open a code to explore its city, county and postal location.
Open the full directory ↓217ZIP codes
- Recorded ZIP range
- 51001–51656
- 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
51xxx · ZIP codes
Page 1 / 4ZIP 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.