Area codes, places,
and the stories behind them.
Look up where an area code serves, how it changed, and which codes it split from or overlaps — every fact cited to its source.
Simplified illustration — see the 213 profile for the full lineage.
Start with a state or province
Choose a country, then browse every state or province it covers — each opens its area codes, place details and history. This atlas spans the North American Numbering Plan (+1).
Every area code
A source-cited profile for every area code — the place it covers, its split/overlay relationships and its history. 433 codes across the U.S., Canada and other NANP members. Not a ranking.
How L.A.'s original area code split into today's core codes
A single code — 213 — once served a broad Southern California territory. Follow the 213 lineage of splits and overlays that produced the core Los Angeles County codes, each event dated and cited to CPUC records.
Compare area codes
Two codes side by side — place, history and how they relate. Only facts with a source; no invented "value" scores.
Every page cites its sources and marks its last-verified date — see how this is made. Facts licensed CC BY 4.0. Underlying numbering data: NumberResearch.