Area code 708 covers western and southern Cook County and eastern and southern Will County in Illinois. It was split off from area code 312 in 1990, and once covered all of Chicagoland until 1996 when area code 847 and area code 630 were broken off. Cook County is a county located in the state of Illinois. ... Will County is a county located in the northern part of the state of Illinois. ... Official language(s) English Capital Springfield Largest city Chicago Area - Total - Width - Length - % water - Latitude - Longitude Ranked 25th 149,998 km² 340 km 629 km 4. ... Area code 312 encompasses the Chicago Loop and surrounding areas in Chicago, Illinois. ... This article is about the year. ... Chicagoland. ... 1996 (MCMXCVI) is a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ... 847 This page is a candidate for speedy deletion. ... Area code 630 covers the entirety of Dupage and Kane counties in Illinois, and the northern part of Will County. ...