North American telephone area codes 419 and 567 serve the northwest quadrant of the U.S. state of Ohio. The largest city served by these area codes is Toledo (and its suburbs of Holland, Maumee, Northwood, Oregon, Ottawa Hills, Perrysburg, Rossford, Sylvania, Swanton, Waterville, and Whitehouse).
Other municipalities served by these area codes include Ada, Ashland, Bellevue, Bluffton, Bowling Green, Bryan, Bucyrus, Celina, Clyde, Crestline, Defiance, Delphos, Edgerton, Edison, Edon, Findlay, Fostoria, Fremont, Galion, Genoa, Kenton, Lima, Mansfield, Montpelier, Mount Gilead, Napoleon, Norwalk, Oak Harbor, Port Clinton, Sandusky, Shelby, St. Marys, Tiffin, Upper Sandusky, Ohio, Van Wert, Wapakoneta, Wauseon, and Willard. Other areas served include the Lake Erie Islands north of Port Clinton and west of Sandusky.
Area code 419 was assigned as one of the original area codes in October 1947. The overlay area code 567 was created on January 1, 2002. Despite the presence of Toledo, the state's fourth-largest city, 419 was the last of Ohio's original four area codes to be split or overlaid. However, because of the choice of an overlay, it is the only one of Ohio's original four NPAs, and one of the few original NPAs not covering an entire state, that still has its original boundaries.
|North: 517, 734, 519/226/548, Lake Erie|
|West: 260||419/567||East: 330/234, 440|
|South: 740/220, 937/326|
|Indiana area codes: 219, 260, 317/463, 574, 765, 812/930|
|Michigan area codes: 231, 248/947, 269, 313, 517, 586, 616, 734, 810, 906, 989|
|Ontario area codes: 226/519/548, 249/705, 289/365/905, 343/613, 416/437/647, 807|