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Area code for Chicago
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Key neighborhoods and districts
Prefix: 312
Downtown business district and financial center
Prefix: 312
Galleries, restaurants, and creative businesses
Prefix: 312
Tech startups and trendy restaurants
Prefix: 773
Residential neighborhoods and local businesses
Prefix: 773
Historic neighborhoods and universities
Chicago is the third-largest city in the United States and the business capital of the Midwest. Known for commodities trading, manufacturing, transportation, and a diverse economy, Chicago is home to major corporations and the CME Group. The city uses area codes 312 (downtown Loop), 872 (downtown overlay), 773 (neighborhoods), and 872/312 for newer assignments.
Chicago's central business district with major corporations
Format: +1 312 XXX XXXX
Retail, hospitality, and corporate offices on Michigan Avenue
Format: +1 312 XXX XXXX
Growing tech hub and creative industries
Format: +1 312 XXX XXXX
Advertising, design, and media companies
Format: +1 312 XXX XXXX
Chicago is in the Central Time Zone, 1 hour behind New York. Business hours are strictly 9 AM - 5 PM with lunch from 12-1 PM. Winters are harsh, so plan for potential delays November-March. The city empties out on summer Fridays as people head to Wisconsin lake houses.
Step-by-step dialing instructions
Dial the full 10-digit number. 312 is the prestigious downtown code, 773 covers most neighborhoods.
312 is The Loop and downtown, 773 covers city neighborhoods, 872 overlays both. Suburbs use 847, 630, 708, and others.
All major carriers have excellent coverage. Verizon and AT&T are strongest in the Loop.
Chicagoans are friendly but businesslike. Midwest values mean punctuality and reliability are highly valued. Small talk about weather or sports (especially the Bears or Cubs) is common.
Example: +1 312 1234567
Common reasons people call this city
Connect with CME Group, trading firms, and financial services
Reach manufacturing companies and industrial businesses
Contact airlines (United HQ), railroads, and shipping companies
Connect with major hospital systems and medical research
Key statistics and information
Population
Time Zone
Business Hours
Peak Times
Get answers to common questions
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