Area codes are crucial to place calls where they ought to go. Without them, there would never be enough telephone numbers to go around. Area codes can tell you where a call comes from and can also ensure that your telephone is going in the right direction. But, there are some interesting facts you may find interesting in relation to those three digit numbers.
Though not all area codes added today have a zero or a one as the center digit, that was the practice up until the past decade or so. Beyond that, you could tell something about a place through the original area codes. If the code had a zero as the middle number, it came from a state that initially only had one area code for the entire state. If the center number was a one, it was from one of those states that had to have more than one for population reasons.
Along the same lines, the zero and one format was used up until the year 1995. Because of the demand for so many new numbers so quickly, new codes were used that would not have been used in the past. The very first place code to veer away from the one and zero formula was the 334 code that was put to use in Alabama that year. The code 360 was put into use in Washington State very shortly thereafter.
This was for people reasons and due to the fact that all phones were rotary phones then. Each number was designated by pulses rather than just a tone. They go the area codes like 212. Areas with smaller populations got the higher amounts like 717, just as an example.