Area code 304
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North American telephone area code 304 was established October, 1947 as one of the original area codes, and serves all of West Virginia.
| State of West Virginia Area Code: 304 | ||
| North: 234/330, 724/878 | ||
| West: 606, 740 | area code 304 | East: 240/301 |
| South: 276, 540 | ||
| Commonwealth of Kentucky Area Codes: 270, 502, 606, 859 | ||
| State of Maryland Area Codes: 240, 301, 410, 443 | ||
| State of Ohio area codes: 216, 234, 419, 440, 567, 330, 513, 614, 740, 937 | ||
| Commonwealth of Pennsylvania Area Codes: 215, 267, 412, 484, 570, 610, 717, 724, 814, 835, 878 | ||
| Commonwealth of Virginia Area Codes: 276, 434, 540, 571, 703, 757, 804 | ||
