The 618 area code serves southern Illinois, covering the Metro East region across the Mississippi River from St. Louis along with Carbondale and the state’s southern tip. One of the original 1947 codes, it is now overlaid by area code 730. If a 618 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 618 at a Glance
| Detail | Information |
|---|---|
| Area Code | 618 |
| State | Illinois (IL) |
| Major Cities | Belleville, Carbondale, Alton, Edwardsville |
| Time Zone | Central Time (CT) |
| Country Code | +1 (USA) |
| Overlay Codes | 730 (co-located) |
Geographic Coverage & Major Cities
Area code 618 covers the entire southern portion of Illinois, including St. Clair, Madison, Jackson, and Williamson counties among many others. It spans from the industrial Metro East near St. Louis down to the rural far south of the state.
- Belleville & East St. Louis – major Metro East cities in St. Clair County
- Alton & Edwardsville – Madison County cities near the Mississippi River
- Carbondale – home of Southern Illinois University
- Marion, Mount Vernon & Centralia – established southern Illinois communities
From the St. Louis metro’s Illinois side to the forests of Little Egypt, a 618 number reflects the character of southern Illinois.
A Brief History of Area Code 618
Area code 618 was one of the original area codes established in 1947, covering southern Illinois. As numbering demand grew, the 730 overlay was added in 2022 across the same region, and 10-digit dialing became mandatory.
Time Zone & Best Time to Call
Numbers in the 618 area code use Central Time (CT). The region observes Daylight Saving Time, shifting from CST (UTC-6) to CDT (UTC-5) between March and November each year.
How to Dial Phone Numbers in Area Code 618
Because 618 shares its region under an overlay, the area requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Include the area code – 618-XXX-XXXX.
- 11-digit dialing: You can also dial 1-618-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 618 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 618 XXX XXXX
- From any mobile phone worldwide: +1 618 XXX XXXX
Is Area Code 618 a Scam? Safety & Protection Tips
Area code 618 is a legitimate Illinois area code – a call from it is not fraudulent by default. However, scammers frequently spoof local codes like 618, faking the caller ID so their number appears to come from a trusted local line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Bank & card fraud alerts | Claims of suspicious activity seeking your account details |
| Utility shut-off threats | Fake Ameren Illinois disconnection demands |
| Package delivery scams | Fake texts or calls about a failed delivery with a bad link |
How to report, block, and look up 618 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in Illinois
Area code 618 shares and borders several other codes:
- 730 – the overlay that shares southern Illinois with 618
- 217 – central Illinois to the north (see our 217 area code guide)
- 309 – the Peoria area and west-central Illinois (see our 309 area code guide)
- 314 – St. Louis, Missouri, directly across the Mississippi River
Explore more codes across the state on our Illinois area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Illinois:
- Wisconsin – area code 414
- Iowa – area code 515
- Missouri – area code 314
- Kentucky – area code 502
- Indiana – area code 317
Frequently Asked Questions About Area Code 618
Where is the 618 area code located?
Area code 618 covers southern Illinois, including Belleville, Carbondale, Alton, and Edwardsville. It operates on Central Time and is overlaid by area code 730.
Does the 618 area code have an overlay?
Yes. Area code 730 was added in 2022 as an overlay covering the same southern-Illinois territory, which is why the region uses 10-digit dialing.
Is 618 a landline or cell phone area code?
Both. Area code 618 serves landlines, mobile phones, and VoIP numbers throughout southern Illinois.
Should I answer a call from an unknown 618 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 618 Guides
- Is a 618 call safe? Read Is area code 618 a scam? Spam & safety guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.