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# Quebec Area Code 873
The 873 area code is a North American Numbering Plan (NANP) overlay area code that serves the province of Quebec, Canada. Implemented in 2017, it was created to address the growing demand for telephone numbers in the region, particularly in areas already served by the 514 area code. The 873 area code covers the same geographic territory as 514, which encompasses Montreal and its surrounding regions. As an overlay code, 873 numbers exist alongside 514 numbers in the same service area, meaning both area codes serve identical geographic boundaries. This allows telecommunications companies to continue assigning phone numbers without requiring customers to change their existing numbers or relocating their services.
The North American Numbering Plan is a standardized system that organizes telephone numbers across the United States, Canada, and several Caribbean nations. Area codes are the first three digits of a ten-digit phone number and are assigned based on geographic regions called numbering plan areas (NPAs). When a region exhausts its available numbers within an existing area code, telecommunications regulators introduce overlay area codes like 873 to provide additional numbering resources. This system ensures efficient number allocation while maintaining the infrastructure necessary to support growing populations and increased communication demands. The implementation of overlay codes allows service providers to manage number availability without the disruption and expense associated with geographic splits, which would require some customers to change their area codes entirely.