Related Clues:

• Certain three-digit number
• Exchange preceder
• Geographical indicator
• Regional figure?
• Long-distance need
• Phone number?
• 727 in Florida, e.g.
• Montana has only one
• 208 in Idaho, e.g.
• 800, e.g.
• Baltimore's 410
• Phone number prefix
• Prefix in parentheses
• 747 in California, e.g.
• Seattle's 206, e.g.