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Random US Area Codes

Generate random US telephone area codes with the state, region, time zone, major cities served, and historical or coverage notes.

Last updated: May 31, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution

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What is Random US Area Codes?

US telephone area codes identify geographic regions within the North American Numbering Plan (NANP). Each area code corresponds to a specific geographic area, time zone, and set of communities it serves.

This generator picks random area codes from across the country, showing you which state and cities are covered, the local time zone, and interesting background notes — useful for developers building test data, writers adding realistic detail, or anyone curious about US telephony geography.

How to Use Random US Area Codes

1

Choose a region to filter by (or leave on "All").

2

Set how many area codes to generate.

3

Click "Generate".

4

See the area code, state, region, time zone, and major cities.

Common Use Cases

  • Generating realistic US phone number prefixes for test data or mockups.
  • Checking which state or region a given area code belongs to.
  • Understanding US time zone distribution by phone area code.
  • Geography and trivia about American telephone history.

Example Input and Output

A Northeast result.

Region
Northeast
Area Code
617 — Massachusetts (Eastern) — Boston, Cambridge — Covers Boston and surrounding communities including Cambridge.

Frequently Asked Questions

Are all US area codes included?
No — this generator includes 37 notable area codes across all major regions. The full NANP list has hundreds of codes including overlays and new assignments.
What is an overlay area code?
An overlay shares the same geographic area as an existing area code to provide more phone numbers as the original runs out. For example, 347 is an overlay for 718 in New York City's outer boroughs.
Why does Arizona's area code note say "no DST"?
Arizona does not observe daylight saving time (with the exception of the Navajo Nation), so its offset from other US time zones changes depending on the time of year.

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