In most countries, the digits after the country code, and before the city code for a phone call.

North American area codes are sometimes called NPAs, an acronym for Numbering Plan Area. This comes from the acronym NANP (North American Numbering Plan). If you have a relatively old area code--one with a middle digit of or 1--it reflects the relative population of your area when the NANP first came into existence. Populous areas like New York (212) got "low dial-pull" numbers: ones that could be dialed quickly on rotary phones.

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