Browse all 65 US states and territories to find their telephone area codes. The United States uses 337 active area codes as part of the North American Numbering Plan (NANP). Each state has between 1 and 36 area codes depending on its population and telephone demand.
The distribution of area codes across the United States reflects each state's population density and telecommunications demand. States like California and Texas have dozens of area codes to serve their massive populations, while smaller states like Wyoming and Vermont operate with just a single area code.
When the North American Numbering Plan was created in 1947, each state received one or a few area codes. As populations grew and the demand for phone numbers increased — driven by fax machines, pagers, cell phones, and internet connections — states added new area codes through splits (dividing an existing area code's territory) or overlays (assigning a new code to the same geographic area).
Today, all US states require 10-digit dialing for local calls following the FCC's mandate to support the 988 Suicide & Crisis Lifeline. This means you must always dial the area code, even when calling someone in the same area code as you.
