872 area code
Chicago area, Central Time.Area code 872 covers Chicago in Illinois, on Central Time. 312 covers the same area.
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 872 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 872 has 1. Each one's share is how many 872 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 an 872 number?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every 872 number to them, since you can't tell a work line from a personal cell.
What applies to 872Every 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
872 and 312
872 went into service on November 7, 2009. 872 and 312 cover the same area, so new numbers can get either code and neighbors can have different area codes. 872 holds 27% of the area's exchanges; 312 holds the most. Local calls take all 10 digits.
- 1947312 overlay
- 2009872 starts
Source: NANPA area code database
Calling a list of 872 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.
872 area code FAQ
What area code is 872?
872 is an Illinois area code for Chicago.
What time zone is the 872 area code in?
Central Time (CST, UTC-6; CDT, UTC-5 in summer).
Is 312 the same as 872?
Same area, different code. 872 and 312 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 872 numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
When did the 872 area code start?
On November 7, 2009.
Calling 872 numbers? Reach more of them.
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