Main city: Chicago
Timezone: Central
Phone type: Cell Number
Operator: Us Xchange Of Illinois LLC DBA Choice One Comm Il

Chicago, the third most populous city in the United States, after New York City and Los Angeles. With 2.7 million residents, it is the most populous city in both the U.S. state of Illinois and the American Midwest. Its metropolitan area, sometimes called Chicagoland, is home to 9.5 million people and is the third-largest in the United States. Chicago is the seat of Cook County, although a small part of the city extends into DuPage County. ^source

Area codes 847 and 224 are Illinois area codes covering most of the northern suburbs of Chicago. They serve most of Lake County, the northern part of Cook County, the northern part of Kane County, and a small part of McHenry County. ^source