ZIP prefix directory
03xxxZIP prefix 03 — Places & codes
These 292 ZIP codes share the opening digits 03. Follow the smaller groups or open a code to explore its city, county and postal location.
Open the full directory ↓292ZIP codes
- Recorded ZIP range
- 03031–03911
- Associated states & postal regions
- 2
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
03xxx · ZIP codes
Page 1 / 5ZIP 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.