Area code · IL
312 area code
The 312 area code serves Chicago, Illinois. Look up a specific 312 number, check spam reports, and stop spam calls automatically.
schedule2 min readUpdated May 15, 2026By the Halo team
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Location
Chicago, IL
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Timezone
Central
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State
Illinois
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Major cities
Downtown Chicago
ABOUTAbout the 312 area code
The 312 area code is assigned to Chicago, Illinois. Phone numbers with this area code are used by residents and businesses in the Chicago metropolitan area and surrounding communities.
If you've received an unwanted call from a 312 area code number, use the Halo phone lookup tool to check if it has been reported as spam. Halo AI blocks 99% of spam calls at the network level, protecting you from robocalls, scams, and telemarketers before they ever reach your phone.
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