What is Area code 312?
'''Area code 312''' is an area code that is part of [[Illinois]]. It was one of the first area codes created in 1947. It initially covered the entire northeastern portion of Illinois, but after it was split by 708 in 1989, 630, 847, and 773, all in 1996, it now covers only downtown Chicago, with 708 and 773 covering the rest of Chicago. It was overlaid by 872 in 2009. [[Category:Area codes in the United States|312]] {{US-stub}}