Area code question: Where is area code 331? Did someone call you with an area code 331 and you want to know where they are calling from? Is the number on your Caller ID showing area code 331 and you are wondering where that person or business is located?
The location of area code 331 is
Illinois
In other words, individuals and businesses with a telephone number that has the area code 331 may be from Illinois.
There are many instances where someone with area code 331 is not actually calling from Illinois. They may have moved from Illinois, but not bothered changing their cell phone number or they may have ported their number from Illinois to another state.
Furthermore, there are ways for "businesses" and individuals to get a phone number with area code 331, even though they are not located in or calling from Illinois.
Thus, the 331 area code belongs to Illinois, but these days that does not necessarily mean that the caller is from Illinois or located in Illinois.
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Where is area code 332?
Now you know that the area code 331 is for Illinois. Go here for the next area code on our list.
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