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# California Area Code 661
The 661 area code serves Kern County in California's Central Valley, covering cities such as Bakersfield, Delano, and Ridgecrest. Established in 1999 as an overlay to the existing 805 area code, the 661 code was created to accommodate the growing population and telecommunications demand in this economically important agricultural and energy production region. The area code covers approximately 8,150 square miles and serves both urban and rural communities in the southern San Joaquin Valley. Residents and businesses in this region use the 661 prefix for local phone numbers, while the 805 code remains active in the same geographic area, allowing both codes to coexist and serve the region's telephone numbering needs.
The North American Numbering Plan (NANP) is the standardized system that designates area codes like 661 throughout the United States, Canada, and other territories. This system, established in 1947, organizes telephone numbers into a hierarchical structure, with area codes representing the first three digits of a ten-digit phone number. The NANP is managed by the North American Numbering Plan Administration (NANPA) in coordination with telecommunications regulatory bodies in each country. When demand for phone numbers in a region exceeds available capacity, new area codes like 661 are created through a process that considers geographic boundaries, existing infrastructure, and projected growth. This systematic approach ensures efficient allocation of telephone numbers while maintaining compatibility across North America's interconnected telecommunications network.