An area code is the first three digits of a phone number in the North American Numbering Plan. When you ask what area code is 614, you’re essentially asking which geographic region those numbers are associated with.
Area code 614 is tied to Central Ohio, most strongly associated with Columbus. In practice, it means many landline numbers and some mobile numbers in that region use 614, though modern calling technology can make an area code less perfect at proving someone’s exact location.
That last point matters. Today, numbers can be ported, reassigned, or used by carriers in ways that don’t always match where someone physically is. So 614 is a strong hint about the number’s originating region—but it’s not a guarantee.