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# California Area Code 840
The 840 area code is an overlay area code that serves the greater Sacramento metropolitan region in California's Central Valley. Implemented in 2021, it was created to address the growing demand for telephone numbers in the 916 area code, which had become depleted due to rapid population growth and increased telecommunications needs in the region. The 840 overlay covers the same geographic territory as the 916 area code, including Sacramento, the state capital, as well as surrounding communities like Folsom, Carmichael, and Citrus Heights. Residents and businesses in this region can now be assigned phone numbers with either the 916 or 840 area code, depending on availability and telecommunications carrier assignments.
The North American Numbering Plan (NANP) is the standardized system that designates and manages area codes across the United States, Canada, and other North American territories. When an area code becomes saturatedtypically after assigning millions of phone numberstelecommunications regulators create overlay codes like 840 to ensure adequate numbering resources without requiring customers to change their existing numbers or area codes. The NANP is administered by the North American Numbering Plan Administration (NANPA), which coordinates with the Federal Communications Commission (FCC) and telecommunications companies to maintain the integrity and efficiency of the numbering system, ensuring that both traditional landlines and modern mobile communications have sufficient available numbers.