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# Indiana Area Code 812
The 812 area code serves southern Indiana, covering a significant portion of the state's population and geography. This area code encompasses major cities including Evansville, Bloomington, and the surrounding regions. The 812 area code was established in 1957 as part of the original North American Numbering Plan (NANP) implementation, making it one of the older area codes in the United States. It covers approximately 11 counties in Indiana and serves both urban centers and rural communities throughout the southern part of the state.
The North American Numbering Plan is a standardized system used across the United States, Canada, and other North American territories to organize telephone numbers into geographic regions. Under this system, the country is divided into area codes, which are three-digit numbers that identify specific geographic areas. Area codes like 812 are the first three digits of a ten-digit phone number and help route calls to the correct region. The NANP was designed to create an efficient, organized telecommunications infrastructure, with area codes assigned based on population density and geographic boundaries. When a region's population grows significantly, new area codes may be created through a process called "area code relief," though the 812 area code continues to serve its established territory in southern Indiana.