Area code 618

Area code 618 at a glance

Area code 618 is a geographic area code in Illinois, in service since January 1, 1947, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 618 and 730 cover the same territory, so neighbors on the same street can have different area codes. It is in the Central time zone. The places with the most assigned exchanges include Collinsville, Carbondale, Belleville, Centralia, and Granite City. By population, its largest named places are Grafton, Troy, Belleville, Edwardsville, and Collinsville.

Cities and towns in area code 618

618 holds 8.8% of the 8,977 central office codes assigned in Illinois, the 3rd most of the state's 17 codes. 211 Census places could be matched to rate centers with 618 exchanges; the most populous are Grafton (57,530), Troy (50,113), Belleville (40,560), and Edwardsville (40,499). Each place page lists the exact prefixes and carriers for that town.

Dialing 618 numbers

According to NANPA's dialing-plan data, local calls within 618 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 digit permissible at service provider discretion."

Phone companies in area code 618

56 carriers hold the 786 central office codes assigned in 618. Frontier North, INC. - Il has the most, with 126 (16%). 608 of the codes (77%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Where 618 numbers are rated

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 618 has codes in 242 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

How full is area code 618?

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 786 are assigned in 618, 98% of 800. 106 were assigned in 2020 or later.

Using area code 618 for business calls

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

Porting a number you already use in area code 618 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.