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US area code · Illinois

618 area code

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.

Number holders in area code 618

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 800 prefixes are in use in 618, shared by 62 companies. The largest holders:

CompanyPrefixesShare
Frontier North, Inc.12616%
Illinois Bell Tel Co11114%
New Cingular Wireless PCS, LLC9512%
Cellco Partnership Dba Verizon Wireless628%
Level 3 Communications, LLC466%
T-Mobile USA, Inc.405%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 618 numbers

Reports to the FTC, last 30 days
721
Recorded messages or robocalls
75%
Rank among area codes
#102 of 670
Most reported subjects
Other (320)
Reducing your debt (credit cards, mortgage, student loans) (125)
Dropped call or no message (118)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

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

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