The assignment of telephone area codes may seem random but actually it's pretty sensible. The North American Numbering Plan, of which the area codes are a part, was worked out in the late 1940s to ensure standardized numbering nationwide, helping to make direct-dial long distance possible. (Prior to that time, one had to go through an operator, that is 'trunk call').
On the rotary-dial phones then in use, dialing a nine (9) took a lot longer than dialing a one(1), which tied up expensive switching equipment. So AT&T assigned "low dial pull" numbers to the markets with the most telephones and thus presumably the highest number of incoming long-distance calls. New York got 212, Chicago 312, L.
A 213, Detroit 313, Dallas 214 and so on. Strangely Washington D. C got 202 and Maryland 301 (Zero, remember, has the highest dial pull of all) may be this anomaly represented some "smoldering vendetta" against the Eastern Seaboard :-) Anyway.
The issue of dial pulls became academic with the ... more.
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