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Both area code 847 and area code 224 are part of an overlay plan that covers most of Lake County, the northern part of Cook County, the northern part of Kane County, and a small part of McHenry County in Illinois. On January 5, 2002 area code 224 overlaid the 847 NPA and 10-digit dialing was implemented. Previously, on January 20, 1996 area code 847 split off from area code 708. Area code 708 had previously split off from 312, which had covered the majority of northern Illinois until 1989.
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