Prefix Information
The prefix 603 is part of area code 206 serving Seattle, Washington.
This exchange contains 10,000 possible phone numbers (206-603-0000 through 206-603-9999).
Phone numbers with prefix 603 in area code 206. Location: Seattle, Washington.
The prefix 603 is part of area code 206 serving Seattle, Washington.
This exchange contains 10,000 possible phone numbers (206-603-0000 through 206-603-9999).