ZIP prefix directory
1xxxxZIP prefix 1 — Places & codes
These 4,423 ZIP codes share the opening digits 1. Follow the smaller groups or open a code to explore its city, county and postal location.
Open the full directory ↓4,423ZIP codes
- Recorded ZIP range
- 10001–19980
- Associated states & postal regions
- 3
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
1xxxx · ZIP codes
Page 2 / 74ZIP 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.