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# Ontario Area Code 365
Area code 365 is an overlay area code serving the Greater Toronto Area (GTA) in Ontario, Canada. Implemented in 2016, it covers the same geographic region as area code 416, which serves downtown Toronto and surrounding urban areas. The 365 overlay was introduced to address the depletion of available phone numbers in the 416 area code, allowing telecommunications providers to issue new phone numbers with the 365 prefix while maintaining service continuity for existing 416 subscribers. Today, both area codes serve the same territory, and new phone numbers in this region are assigned from either code depending on availability and carrier allocation.
The North American Numbering Plan (NANP) designates area codes through a systematic process managed by the North American Numbering Council (NANC) and regulated by the Federal Communications Commission (FCC) in the United States and the Canadian Radio-television and Telecommunications Commission (CRTC) in Canada. When an existing area code approaches exhaustiontypically when 80-85% of available numbers have been assignedtelecommunications regulators implement an overlay area code to serve the same region. This strategy allows for continued growth in phone number availability without requiring customers to change their existing numbers or area codes. The NANP system ensures efficient allocation and prevents service interruptions while accommodating population growth and the increasing demand for phone numbers in densely populated regions like the GTA.