312 Area Code
Covers Chicago and nearby communities in Illinois.
(312) 555-0142Area code 312 map
Interactive coverage map for area code 312, centered on Chicago, Illinois
41.8781, -87.6298
Open in OpenStreetMapArea code 312 coverage map — centered on Chicago. Shaded area shows the approximate reach around the primary city.
If you are trying to place Chicago, IL on the map, area code 312 is the one that covers it. It reaches roughly 210,000 people across places such as Chicago Loop, River North, Near North Side, Gold Coast and more. The region observes Central time, so a number like (312) 555-0142 is on that clock right now. An original 1947 code that once covered all of Chicago before 773 split off the outer neighborhoods in 1996. It shares its territory with the overlay code 872, which sit on the exact same map. Because the 312 region uses more than one area code, you must dial all ten digits — area code included — even for a local call. You do not, however, need to dial a leading 1 for calls within the US and Canada. On this page you'll find a live local clock for Chicago, an interactive coverage map, the cities and counties 312 serves, its overlay and neighboring codes, and tips on spotting 312 spam calls.
Cities covered by 312
Cities & neighborhoods
- Chicago Loop
- River North
- Near North Side
- Gold Coast
- Streeterville
- West Loop
Nearby & overlay area codes
Overlay codes (same area)
These share 312’s geography — a number in either code can be on the same street.
Neighboring codes
Codes for adjacent regions and metros.
Is a call from 312 a scam?
Because 312 covers a dense metro around Chicago, it's a common source of both real business calls and spam. Legitimate 312 calls come from local businesses, offices and neighbors; scam calls in this region tend to imitate delivery services, banks and utilities. Remember that caller ID is trivially spoofed — a scammer anywhere can make a 312 number appear on your screen — so the area code alone never proves a call is genuinely local.
Red flags to watch for
- Pressure to act right now, or threats of arrest, fines, or service being cut off.
- Requests to pay with gift cards, wire transfer, crypto, or a payment app.
- Asking for passwords, one-time codes, your SSN, or full card/bank numbers.
- A robocall or recording, or a number that won’t let you call back.
When unsure, hang up and call the organization back on a number you look up yourself.
Calling a 312 number from abroad
Every 312 number is a US/Canada +1 number. From a mobile anywhere, the simplest approach is to dial it in international format:
+1 312 555-0142If your phone can’t dial the +, replace it with your country’s exit code, then 1, then the number:
- UK, Germany, France & most of Europe
00 1 312 555-0142 - Australia
0011 1 312 555-0142 - Japan
010 1 312 555-0142 - Mexico
00 1 312 555-0142
Within the US and Canada you don’t need any of this — just dial the ten digits 312 555-0142.
Reverse phone lookup
Check any US or Canada number to see whether it's a working line, which carrier it sits on, whether it's mobile, landline or VoIP, and roughly where it's registered.
Shows carrier, line type and location. Owner name isn't available here.
Results are for personal, informational use only and may not be used for employment, credit, housing or tenant-screening decisions.
Area code 312: frequently asked questions
Where is the 312 area code located?
The 312 area code is located in Illinois, centered on Chicago. It covers Cook County and nearby communities including Chicago Loop, River North, Near North Side, Gold Coast, Streeterville, West Loop.
What time zone is 312 in?
Area code 312 is in the Central time zone (UTC-6 (CST) / UTC-5 (CDT)). You can see the exact current local time for Chicago on the live clock above.
What cities use area code 312?
Cities and areas that use 312 include Chicago Loop, River North, Near North Side, Gold Coast, Streeterville, West Loop. Its primary city is Chicago, IL.
Do I need to dial 1 before 312?
For calls within the US, you do not need to dial a leading 1, but you do need all ten digits: 312 plus the seven-digit number. The 312 area requires ten-digit dialing because more than one area code serves it.
Is 312 a toll-free or scam number?
No — 312 is a normal geographic area code for Chicago, not a toll-free code (toll-free codes are 800, 833, 844, 855, 866, 877 and 888). A 312 number is not inherently a scam, but the code can be spoofed. See the spam-call section above for how to tell.
What are the overlay area codes for 312?
Area code 312 is overlaid by 872, meaning those codes cover the same geographic area.