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312 Area Code: Location, Time Zone & Phone Lookup - Page 2

(312)
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Area code 312 has a long and interesting history. It was one of the original area codes created in 1947, and it has served the Chicago area for over seventy years.The 312 area code was originally assigned to northern Illinois and part of southern Wisconsin. It covered the Chicago metropolitan area and a large chunk of the rural area in between.

Over the years, the 312 area code has been split and re-split a number of times. Today, it covers only the City of Chicago and a small surrounding area. All other areas of northern Illinois have been given new area codes.

The 312 area code is now in the process of being overlaid with the new 773 area code. This will create a single area code for the entire Chicago metro area.

The 312 area code serves the city of Chicago and the surrounding suburbs. It was one of the original area codes created in Illinois in 1947.

Phone Number Prefixes In The 312 Area Code