Get a local business phone number in Granite City, IL

Area codes in Granite City

With 26,854 residents in the Census 2024 estimate, Granite City sits in Madison County, Illinois. NANPA lists 25 exchanges for its rate center across 2 area codes; 618 has the most (22, 88%). 618 is part of an overlay with 730, so a new local number in Granite City may carry any of those codes depending on which have numbers available. Granite City is in the Central time zone.

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.

Who holds Granite City phone exchanges

5 carriers hold the 25 exchanges assigned to Granite City's rate center. Illinois Bell Tel CO has the most, with 9. 20 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.

Local prefixes for Granite City

These are the central office codes NANPA records for Granite City. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2001. 6 of the 25 were assigned in 2020 or later.

When Granite City's exchanges were assigned

Assignment dates show when each block of Granite City numbers was added to the local supply.

How local numbers work in Granite City

What a caller sees as "local" is the area code plus prefix. In Granite City, those come from the GRANITE CY rate center, as recorded by NANPA.

New local numbers are drawn from carrier inventory, so the exact 618 numbers available change over time; porting an existing number is free.

The local business market

Granite City is part of the St. Louis, MO-IL metro area, home to 2.8 million people in 2024. County Business Patterns counted 69,470 business establishments in the St. Louis, MO-IL metro area in 2023, employing 1,263,674 people. The largest sectors by establishment count are health care and social assistance (10,427), retail trade (8,095), and professional, scientific, and technical services (7,057).

Setting up a Granite City business line

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

If you already have a number in Granite City, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.

Per-seat phone plans multiply by headcount. For the rounded average establishment size in the St. Louis, MO-IL metro area, 18 users on RingCentral RingEX Core come to $540.00 a month and on Ooma Office Pro $449.10, at month-to-month list prices checked September 28, 2026. On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.