The area code 419 is a telephone area code in the North American Numbering Plan (NANP) for the northwestern part of the U.S. state of Ohio. The largest city served by this area code is Toledo, Ohio. Other major cities in the 419 area include Mansfield, Findlay, Lima, and Bowling Green. It also covers numerous counties and smaller municipalities in northwestern Ohio. Additionally, area code 419 has an overlay area code 567, serving the same geographic region due to increasing demand for phone numbers. In summary:

• Location: Northwestern Ohio
• Major city: Toledo
• Other cities: Mansfield, Findlay, Lima, Bowling Green
• Overlay area code: 567
• Part of Ohio's original numbering plan since 1947

This area code covers a diverse and extensive region in northwestern Ohio, including several counties and smaller towns beyond the major cities mentioned above.