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Downtown Chicago is area code 312. The rest of Chicago is 773. Area code 872 is an overlay on all of the city of Chicago.

Area codes 708, 847, 224, 630, 331, 815, and 779 serve various suburbs of Chicago.

The telephone country code for the USA (and also Canada and certain nearby islands) is +1.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)

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12y ago

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