Find any 815- phone number in Illinois
The 815 area code is designated primarily for the state of Illinois. This numerical code is unique to the North American Numbering Plan, and it is used to identify certain geographic regions in the state of Illinois. Upon its original activation in 1947, the 815 area code was one of the original 86 area codes that came into being when the North American Numbering Plan was established.
The North American Numbering Plan is a system that divides the United States of America and Canada associated telephone exchanges into geographical regions. These regions are referred to numerically as area codes. Area codes are made up of three digits, allowing for up to 8 million possible phone numbers within the single area code. The 815 area code encompasses the North and North Central regions of Illinois—spanning from the Mississippi River to the Wisconsin border. Parts of this region may also overlap with area codes of adjacent states, such as the 847 area code which covers much of the northern region of Illinois.