US area code 872 is Chicago, IL, overlaying 312 and 773.

Area code 773 is an area code for Chicago, Illinois. The city was given this area code on October 12'th, 1996. Before this code the area code was 312, for the whole city until 708 was created for the suburbs only.

In 2009 the area code 773 stopped being in use for the city of Chicago. Instead the state employed a wider area code for the city and its suburbs rather than using two or more area codes for the full area.

Sunny Hills, Florida

The 312 area code is used for downtown Chicago. It is is unusual in that it is completely surrounds by another area code which is 773 and covers the rest of Chicago.