312 Area Code - World Time Zone Map

World Time Zone Map Illinois Area Codes 312

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312 Area code

Central Time

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312 is an area code located in the state of Illinois, US. The largest city it serves is Chicago.

Location, time zone and map of the 312 area code

Local time

--:-- CST

Time difference to GMT/UTC

Standard time:	UTC/GMT -6:00 hours
No daylight saving time at the moment

Daylight Saving Time 2025 (Summer Time)

DST starts on Sunday 09 March 2025, 02:00 DST ends on Sunday 02 November 2025, 02:00

Time zone

The 312 area code lies within the Central Time (CT)

CST - Central Standard TimeCDT - Central Daylight Time when daylight saving time is being observed (from early March to early November)

Location

312 Area code location map

Major cities and communities served by area code 312

Cook County

• Chicago
• Schaumburg
• Wheeling

DuPage County

• Hinsdale

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