Where Is Area Code 872?
Area code 872 serves Chicago, Illinois, and shares the city’s geographic calling territory with area codes 312 and 773. Chicago sits in Cook County in the Great Lakes region of the United States.
The 872 overlay covers Chicago communities such as the Loop, Hyde Park, Lake View, Austin, and South Shore. A Chicago address may use area code 872, 312, or 773 because all three codes serve the same citywide area.
The service area includes landmarks such as Millennium Park, Willis Tower, Navy Pier, and Wrigley Field. Lake Michigan forms Chicago’s eastern boundary, and the Chicago River runs through the city.
Cities and Communities in the 872 Area Code
History of Area Code 872
Area code 872 entered service on November 7, 2009, as an overlay for area codes 312 and 773. It was not created by splitting a new geographic region from an existing area code. An overlay adds a new area code to the same territory, allowing customers with 312 and 773 numbers to keep their existing numbers.
Area code 312 was one of the 86 original North American area codes introduced in 1947. Area code 773 was created in 1996 when most Chicago neighborhoods outside the central area moved from 312 to the new code. The 872 overlay added more telephone number assignments without replacing either older area code.
Key Facts About Area Code 872
- State and primary city: Area code 872 is in Illinois, and Chicago is its primary city.
- Geographic region: Area code 872 serves Chicago in Cook County, within the Great Lakes region.
- Type: Area code 872 is a geographic overlay for area codes 312 and 773.
- Service date: Area code 872 entered service on November 7, 2009.
- Population context: Chicago had 2,746,388 residents in the 2020 U.S. Census, but no official count measures area code subscribers separately.
- Time zone: Area code 872 uses Central Time.
- Landmarks and institutions: The area includes Millennium Park, Willis Tower, Navy Pier, the Art Institute of Chicago, the University of Chicago, and the University of Illinois Chicago.
- Dialing format: The 872 overlay requires 10-digit dialing for local calls within the Chicago service area.
Frequently Asked Questions
What state is area code 872 in?
Area code 872 is in Illinois, and its primary city is Chicago.
What major cities use area code 872?
Chicago is the major city associated with area code 872.
What time zone is area code 872 in?
Area code 872 is in Central Time.
Is area code 872 a toll-free number?
No. Area code 872 is a geographic area code for Chicago, Illinois, not a toll-free number.