where does the area code 475 come from
Area codes 203 and 475 Area code 203 is a North American telephone area code that is assigned to the southwestern part of Connecticut, and is overlaid with area code 475. The numbering plan area (NPA) 203 originally covered the entire state of Connecticut when the North American Numbering Plan was created in 1947. Today the numbering plan area stretches from Connecticut's western border, along its southern coast, to Madison, and north to Meriden. The region encompassed by 203 and 475 roughly corresponds to the Connecticut side of the New York metropolitan area.
Seven-digit dialing The initial 86 area codes were assigned in 1947 as routing codes for operator calls; the first cross-country Bell System direct distance dial call was made in 1951. The system was based on fixed-length numbers; a direct-dial long distance call consisted of a three-digit area code and a seven-digit local number. Numbers in 2L+4N cities (such as Montréal and Toronto) were systematically lengthened to seven digits in the 1950's, a few exchanges at a time, so that all local numbers were seven digits when direct distance dialling finally came to town.