District of Illinois area codes: 312 | |
---|---|
Country | United States |
State/Province | Illinois |
Major City | Chicago |
Time Zone | Central (UTC-06:00) |
Prefix | County | Primary City | Company |
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312-555 | Used in movie | Chicago, IL | Used in movie |
There are 701 prefixes, In the code area, the major cities are Chicago, IL. The major city is Chicago.