Area code
618
618 is a United States area code. Under the North American Numbering Plan it belongs to Illinois, which has 17 area codes in total.
Validate a number in 618
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
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Area code 618 at a glance
NANPA lists 786 central office codes (prefixes) in use in area code 618, held by 54 holders across 242 rate centers.
| Fact | Value |
|---|---|
| In service since | 1947-01-01 |
| Time zone | Central (C) |
| Assigned overlays | 730 (2023-07-07) |
| Prefixes in use | 786 |
| Pooled prefixes | 608 (77%) |
| Rate centers | 242 |
| Companies holding prefixes | 54 |
| Assignment dates on file | 2001-01-04 to 2025-06-18 (294 prefixes) |
| ZIP codes in its places | 184 |
Rate centers in area code 618
| Rate center | Prefixes | Share |
|---|---|---|
| COLLINSVL | 88 | 11% |
| CARBONDALE | 33 | 4% |
| BELLEVILLE | 31 | 4% |
| CENTRALIA | 24 | 3% |
| GRANITE CY | 22 | 3% |
| OLNEY | 16 | 2% |
| ALTON | 15 | 2% |
| MARION | 15 | 2% |
| 234 other rate centers | 542 | 69% |
Who holds the prefixes in 618
Frontier North holds the most prefixes, 126 (16%). 77% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Frontier North | 126 | 16% |
| Illinois Bell Tel | 111 | 14% |
| New Cingular Wireless PCS | 98 | 12% |
| Verizon Wireless | 62 | 8% |
| Level 3 Communications | 46 | 6% |
| T-Mobile USA | 40 | 5% |
| 48 other carriers | 303 | 39% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 618
- 1947-01-01 Area code 618 went into service.
- 2023-07-07 Area code 730 went into service as an overlay in the same area as 618.
Area codes nearest to 618
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
- 730
ZIP codes in area code 618
184 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Belleville, IL | 5 |
| Carbondale, IL | 3 |
| Addieville, IL | 1 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 618 numbers
2,135 FCC complaints are on file for 1,711 numbers in 618, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 138 |
| 2024 | 115 |
| 2025 | 78 |
Other area codes in Illinois
Illinois is one state with 17 area codes in the NANPA table. 618 is one of them.
Next to 618 in the numbering table
These are the codes just before and after 618 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 618 was first assigned in Illinois. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Illinois next to a 618 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 618
Where is area code 618?
NANPA assigns area code 618 to Illinois, United States.
In which state does area code 618 sit?
Illinois. 618 is one of 17 area codes the NANPA table assigns to the state.
Which places does area code 618 cover?
The places with the most ZIP codes among the rate centers in 618 are Belleville, IL, Carbondale, IL and Addieville, IL. The rate center list on this page shows all of them.
Who owns area code 618?
NANPA assigns area codes. Within 618, Frontier North holds the most prefixes, 126 prefixes or 16%.
Which time zone does 618 use?
The NANPA NPA report lists the time zone for 618 as Central (C).
What year did 618 enter service?
The NANPA NPA report gives an in-service date of 1947-01-01, so 618 has been in use since 1947.
Does area code 618 have an overlay?
Yes. 730 (in service 2023-07-07) shares the same area with 618, so numbers from all of them are local to each other.
Which area codes are nearest to 618?
The area codes closest to 618, measured between the centers of the ZIP code places they serve, are 314 (about 65 miles), 557 (about 65 miles), 636 (about 92 miles), 217 (about 104 miles) and 447 (about 112 miles).
How many prefixes does area code 618 have?
NANPA's report dated 2026-10-17 lists 786 prefixes in service in 618, spread over 242 rate centers and 54 holders.
Are there complaints about 618 numbers?
The FCC data on file has 2,135 complaints for 1,711 numbers in 618. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.