503 Area Code
Northwestern Oregon, Oregon
Area code 503 is located in Northwestern Oregon, Oregon. It covers Portland, Beaverton, and surrounding areas in the Pacific time zone (UTC-8). Administered by NANPA.
Where is area code 503?
Area code 503 is located in Northwestern Oregon, Oregon. It covers Portland, Beaverton, and surrounding areas in the Pacific time zone (UTC-8).
Area code 503 is overlaid by area code 971. Both codes serve the same geographic region and require 10-digit dialing for local calls.
Cities Covered by Area Code 503
Area code 503 primarily serves the Northwestern Oregon area of Oregon. The exact coverage includes Portland, Beaverton, and Hillsboro, along with surrounding communities and suburbs.
Time Zone
Pacific Time — UTC-8
Area code 503 operates in the Pacific Time Zone. When calling 503 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 503
Area code 503 was introduced in 1947 as a geographic area code serving Northwestern Oregon, Oregon. As demand for phone numbers grew, overlay code 971 was added to the same region, requiring 10-digit dialing for local calls. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.