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Area code 312 is a telephone area code in the North American ... 630/331 and portions of 815/779–is one of the largest local calling areas in the United States ...
With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the northern part of Illinois, 708, eventually received such with area code 464 taking effect on January 21 ...
2 Area codes by country, state, province, ... 312: Illinois (downtown ... (the former country code for this possession and unorganized territory of the United States)
This makes the fastest-dialing area code 212 (5 total clicks), followed by 312 and 213 (6 clicks). The area code 605 is much slower than these, at 21 clicks. Many large US cities generally had fast-dialing area codes with the middle digit 1. Touch-tone dialing, introduced later, eliminated the wait.
On October 7, 2007, area code 331 began overlaying area code 630, making ten-digit dialing mandatory in the area. The Illinois side of the Chicago area– 312 / 773 / 872 , 708, 847/224, 630/331 and portions of 815/779 –is one of the largest local calling areas in the United States; with few exceptions, no long-distance charges are applied ...
Area code 708 was created on November 11, 1989, in a split of area code 312. It once served almost all of Chicago's suburbs in Illinois. In 1996, its numbering plan area was reduced in a three-way area code split. The northern suburbs received area code 847, while the western suburbs were assigned area code 630.
In addition to being the sole area code in the Space Coast region around the Kennedy Space Center, this is the only partial overlay area code in North America 323: 213: Central Los Angeles, incl. Downtown L.A. and Hollywood: 326: 937: Southwest Ohio: 331: 630: Western suburbs of Chicago: 332, 646 , 917: 212
In 1989, area code 708 was created for the suburbs, leaving the city in area code 312. By the mid-1990s, Chicago's continued growth and the proliferation of cell phones and pagers made it apparent that the city needed a new area code. It was decided to split off all of the city outside the downtown area as 773. The new area code went into ...