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ILLINOIS · AREA CODE GUIDE

312 area code location: Chicago, Illinois

Local date and time
Central Time
312 · 872Chicago

Map data: UCLA Geoportal (2015) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.

312 area code: Illinois
312 area code: Illinois

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312 area code at a glance

State
Illinois
Primary cities
Chicago
Established
Time zone
Central Time
Counties
Cook County and DuPage County
New code planned
No, as of 22 September 2026
Answering calls
Rules for answering calls in Illinois

An area code does not show where a caller is now.

History

  1. : 708 split from 312
  2. : 773 split from 312
  3. : 872 added as an overlay on 312

Sources: NANPA area code listing, NANPA places by area code, U.S. Census Bureau county geography. Checked .

Business phone numbers in area code 312, answered by an AI agent

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