CallataGuidesGet a local business phone number in O'Fallon, IL
O'Fallon's area codes, prefixes and carriers from NANPA records, and how to put a O'Fallon number in front of your customers.
- Area code
- 618 / 730
- Exchanges
- 10NANPA-assigned
- Carriers
- 7
- Population
- 32,169Census 2024 est.
Area codes in O'Fallon
O'Fallon city is a Census place in St. Clair County, Illinois, with an estimated 32,169 residents in 2024. NANPA lists 10 exchanges for its rate center across 2 area codes; 618 has the most (9, 90%). 618 is part of an overlay with 730, so a new local number in O'Fallon may carry any of those codes depending on which have numbers available. O'Fallon 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.
O'Fallon exchanges by carrier
7 carriers hold the 10 exchanges assigned to O'Fallon's rate center. Illinois Bell Tel CO has the most, with 4. 7 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in O'Fallon can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Illinois Bell Tel CO | 4 | 40% |
| Paetec Itel, LLC | 1 | 10% |
| Level 3 Communications, LLC - Il | 1 | 10% |
| Centurylink Communications, LLC | 1 | 10% |
| Teleport Communications America, LLC - Il | 1 | 10% |
| AT&T Enterprises, LLC | 1 | 10% |
| Onvoy, LLC | 1 | 10% |
Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.
Exchanges (NPA-NXX) assigned in O'Fallon
Each prefix below is a block of up to 10,000 numbers that NANPA assigned to O'Fallon's rate center (O FALLON). The earliest assignment date recorded in the file for these codes is 2006. 2 of the 10 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 618 | 206, 589, 607, 622, 624, 628, 632, 680, 726 |
| 730 | 240 |
Source: NANPA utilized central office code file.
When O'Fallon's exchanges were assigned
The table groups O'Fallon's exchanges by the decade NANPA recorded them as assigned.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 1 | 25% |
| 2010s | 1 | 25% |
| 2020s | 2 | 50% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
What makes a number local to O'Fallon
What a caller sees as "local" is the area code plus prefix. In O'Fallon, those come from the O FALLON rate center, as recorded by NANPA.
If your business already has a O'Fallon number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
The local business market
O'Fallon 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).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 2,334 | 45,289 | 19.4 |
| Full-service restaurants | 2,019 | 49,930 | 24.7 |
| Agencies providing services for the elderly and persons with disabilities | 1,898 | 16,546 | 8.7 |
| Physician practices | 1,785 | 22,126 | 12.4 |
| Insurance agencies and brokerages | 1,509 | 7,839 | 5.2 |
| Law offices | 1,393 | 10,509 | 7.5 |
| Offices of real estate agents and brokers | 1,099 | 2,523 | 2.3 |
| Landscaping services | 1,092 | 7,504 | 6.9 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
A O'Fallon number on Callata
Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.
Porting a number you already use in O'Fallon 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.
The comparison below uses 18 users, the rounded average establishment size in the St. Louis, MO-IL metro area. At list prices checked September 28, 2026, that is $449.10 a month on Ooma Office Pro and $540.00 on RingCentral RingEX Core. Callata comes to $359.00 a month for 18 users ($99 a month with 5 users included, then $20 per additional user), below both.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $359.00 | $4,308.00 |
| Quo (Starter) | $19.00 per user | $342.00 | $4,104.00 |
| Nextiva (Core) | $23.00 per user | $414.00 | $4,968.00 |
| Ooma (Office Pro) | $24.95 per user | $449.10 | $5,389.20 |
| Dialpad (Standard) | $27.00 per user | $486.00 | $5,832.00 |
| RingCentral (RingEX Core) | $30.00 per user | $540.00 | $6,480.00 |
Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.
Frequently asked questions
What area code is O'Fallon, IL?
O'Fallon has exchanges in 618 and 730; 618 has the most.
How many phone companies have exchanges in O'Fallon?
7, holding 10 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing O'Fallon business number?
Yes. Porting an existing number to Callata is free. Texting from it starts after carrier registration (10DLC), a one-time $49 fee.
How much is a business phone line in O'Fallon?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 18 users come to $359.00 a month. For comparison, 18 users on RingCentral RingEX Core list at $540.00 a month (checked September 28, 2026).