Geographic Regions and Area Codes

Area code 503 serves the northwestern part of Oregon, encompassing major cities such as Portland, Salem, and Eugene. It also includes surrounding cities like Beaverton, Gresham, Hillsboro, Keizer, Lake Oswego, McMinnville, Oregon City, and Tualatin. The service area spans several counties, including Clackamas, Clatsop, Columbia, Linn, Marion, Multnomah, Polk, Tillamook, Washington, and Yamhill. The 503 area code is overlaid by area code 971, which was introduced in 2008 to accommodate the growing demand for phone numbers.

Key regions within the 503 area code include:

  • Portland
  • Salem
  • Eugene
  • Beaverton
  • Gresham
  • Hillsboro
  • Keizer
  • Lake Oswego
  • McMinnville
  • Oregon City
  • Tualatin