For example , Indiana area code 317 was split to provide a larger number pool in the Indiana suburbs of Chicago ( area code 219 ) .
The allocation of area codes was readjusted as early as 1948 to account for inadequacies in some metropolitan areas .
Indiana area code 317 was split to provide a larger number pool in the Indiana suburbs of Chicago ( area code 219 ) .
The allocation of area codes was readjusted as early as 1948 to account for inadequacies in some metropolitan areas .