What is 773 area code?

The 773 area code serves the city of [https://www.wikiwhat.page/kavramlar/Chicago] Chicago, Illinois, specifically areas within the city that are not covered by the 312 area code. 312 primarily covers the downtown and immediate surrounding areas, while 773 encompasses the majority of the residential neighborhoods. It is an overlay for the 312 area code, meaning that both area codes serve the same geographic region. This requires ten-digit dialing (area code + number) for all calls made within and between the 312 and 773 area codes. The [https://www.wikiwhat.page/kavramlar/overlay%20area%20code] overlay was implemented to address the increasing demand for telephone numbers.