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US area code · Illinois

Area code 618

Where the 618 area code is, its overlay and how to dial a +1 618 number from anywhere.

CoversEast Alton, IllinoisTime zoneCentral (CT)TypeOverlay
Quick answer

The 618 area code is in East Alton, Illinois, United States (Central (CT)). To call from abroad: +1 618 555-0123. It is an overlay, so all 10 digits are dialled.

StateIllinois
Main areaEast Alton
Time zoneCentral (CT)
TypeOverlay
10-digit dialingRequired
In service since01-Jan-1947

The 618 area code is a geographic North American Numbering Plan (NANP) code covering East Alton, Illinois. It has been in service since 01-Jan-1947 and sits in the Central (CT) time zone.

Overlay 618 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

618730

How to dial a 618 number

From abroad+1 618 555-0123
Within the US / Canada1 618 555-0123
Locally (same area)618 555-0123

Cities in the 618 area code

A 618 number is usually in one of these places in Illinois — 3 counties.

Belleville Saint ClairCarbondale JacksonCollinsville MadisonEast Alton MadisonEast Saint Louis Saint ClairEdwardsville MadisonGranite City MadisonO'Fallon Saint Clair

Other Illinois area codes

217224309312331447464630708730773779815847861872

Frequently asked questions

Where is the 618 area code?

The 618 area code is in East Alton, Illinois, United States (Central (CT)).

Is 618 an overlay area code?

Yes. 618 overlays the same region as 730, so callers dial all 10 digits.

Do I have to dial 10 digits for 618?

Yes — dial the area code plus the seven-digit number.

How do I call a 618 number from another country?

Dial your exit code (or +), then 1, then 618, then the number: +1 618 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 618 number does not pinpoint a street or ZIP code.

Missed a call from +1 618?

In the 30 days to September 24, 2026, 721 unwanted calls showing a 618 number were reported to the US Federal Trade Commission, 75% of them recorded messages or robocalls. That puts 618 at #102 of 670 area codes reported.

Other320
Reducing your debt (credit cards, mortgage, student loans)125
Dropped call or no message118
Calls pretending to be government, businesses, or family and friends71
Before you call back
  • If you do not know anyone in Illinois, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 618 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 618 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 618:

Frontier North, Inc. 126Illinois Bell Tel Co 111New Cingular Wireless PCS, LLC 95Cellco Partnership Dba Verizon Wireless 62Level 3 Communications, LLC 46T-Mobile USA, Inc. 40

About 25% of the 800 prefixes in use belong to mobile carriers: a 618 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

All US area codes United States +1 Map of area code 618 — cities & rate centres