US area code & prefix reference

Where a phone number is registered: area codes, NXX prefixes, rate centers and time zones — from official NANPA numbering data. Not a directory of people: numbering facts only, with legal ways to verify a caller.

Enter 3 digits for an area code, 6 for a prefix — e.g. 646 or 646-212.

Most-searched area codes

Most-searched US area codes
CodeStateMajor areaTime zonePrefixes
212 New York New York City Eastern 784
213 California Los Angeles:da 01 Pacific 786
312 Illinois Chicago Central 785
214 Texas Dallas Central 782
215 Pennsylvania Philadelphia Eastern 782
202 District of Columbia Washington Eastern 783
713 Texas Houston Central 785
617 Massachusetts Boston Eastern 768
305 Florida Miami Eastern 784
404 Georgia Atlanta Eastern 781
415 California San Francisco:central Da Pacific 784
313 Michigan Detroit Eastern 763

Full index of all 406 codes →

Toll-free codes

About toll-free numbering →

Unwanted calls

Documented scam patterns behind spoofed and robocall traffic, with official reporting channels — no user-submitted "complaints", only FTC/FCC-documented schemes.

Scam call patterns →
How to spot a spoofed call →
How to report robocalls →

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