The 304 area code is located in the state of West Virginia, US, and covers the entire state
. The largest city it serves is Charleston
. This area code is part of the North American Numbering Plan (NANP) and was established in October 1947 as one of the eighty-six original North American area codes
. In 2009, area code 681 was added as a single overlay to the 304 area code
. The 304 area code is located in the Eastern timezone, which is also known as America/New_York
