Area Code 139 is a relatively new area code in the United States, designated for specific regions. It was introduced to accommodate the growing demand for telephone numbers, particularly in densely populated areas. Area codes are essential for routing calls and ensuring that each phone number is unique within its region. This area code is part of the North American Numbering Plan, which organizes telephone numbering in the U.S. and Canada. Area Code 139 serves a specific geographic area, helping to manage the increasing number of mobile and landline users. It is important for residents and businesses to be aware of their area code for effective communication.