Get a local business phone number in Columbia, IL

What area code is Columbia, IL?

With 10,919 residents in the Census 2024 estimate, Columbia sits in Monroe County, Illinois. NANPA lists 4 exchanges for its rate center across 2 area codes; 618 has the most (3, 75%). 618 is part of an overlay with 730, so a new local number in Columbia may carry any of those codes depending on which have numbers available. Columbia 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 Columbia phone exchanges

4 carriers hold the 4 exchanges assigned to Columbia's rate center. Harrisonville Tel. CO. has the most, with 1. 3 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.

Local prefixes for Columbia

These are the central office codes NANPA records for Columbia. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2001. 1 of the 4 were assigned in 2020 or later.

When Columbia's exchanges were assigned

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

Rate centers and local calling in Columbia

Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Columbia's numbers are rated to the COLUMBIA rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Columbia number.

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

Who does business near Columbia

Columbia 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 Columbia 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 Columbia, 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.