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# Missouri Area Code 235
The 235 area code is an overlay area code serving the St. Louis metropolitan area in Missouri, introduced to provide additional telephone numbers as demand exceeded available resources in the existing 314 area code. Overlay area codes are created within the same geographic region as an existing area code rather than splitting the territory, meaning that both the original and new area codes serve the same communities simultaneously. The 235 area code was established to ensure a continuous supply of phone numbers for businesses, residents, and services in the rapidly growing St. Louis region without requiring customers to change their existing numbers or relocate their service areas.
The North American Numbering Plan (NANP) is the standardized system that designates all area codes across the United States, Canada, and several other North American territories. This system manages the allocation of area codes based on population growth, business expansion, and telecommunications demand in specific geographic regions. When an area exhausts its available phone number inventory, the NANP coordinates with regional telecommunications regulators to introduce overlay codes like 235, ensuring efficient use of numbering resources while maintaining the integrity of the telephone network. This systematic approach allows for orderly expansion of telecommunications infrastructure while preserving existing phone numbers and minimizing disruption to established customers.