773 area code
Chicago area, Central Time.Area code 773 covers Chicago in Illinois, on Central Time. 872 covers it too, along with neighboring codes' areas.
Right now in Chicago
Central Time (CST, UTC-6; CDT, UTC-5 in summer)
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
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Where 773 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 773 has 1. Each one's share is how many 773 numbers start there. Its biggest metro area is Chicago-Naperville-Elgin, IL-IN.
- Chicago100%
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 773 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 773 number to them, since you can't tell a work line from a personal cell.
What applies to 773Every day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
The 773 area code
773 went into service on October 12, 1996, split off from 312. 872 covers 773's area too, along with neighboring codes' areas. Local calls take all 10 digits.
- 1996773 starts
- 2009872 overlay
Source: NANPA area code database
Calling a list of 773 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
773 area code FAQ
What area code is 773?
773 is an Illinois area code for Chicago.
What time zone is the 773 area code in?
Central Time (CST, UTC-6; CDT, UTC-5 in summer).
What are the calling hours for 773 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 773 area code start?
On October 12, 1996. It was split from 312.
Calling 773 numbers? Reach more of them.
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