CallataGuidesGet a local business phone number in St. Elmo, IL
St. Elmo's area code, prefixes and carriers from NANPA records, and how to put a St. Elmo number in front of your customers.
- Area code
- 618
- Exchanges
- 3NANPA-assigned
- Carriers
- 2
- Population
- 1,243Census 2024 est.
St. Elmo area codes
St. Elmo, in Fayette County, Illinois, had a Census-estimated population of 1,243 in July 2024. All 3 exchanges NANPA lists for its rate center are in area code 618. 618 is part of an overlay with 730, so a new local number in St. Elmo may carry any of those codes depending on which have numbers available. St. Elmo 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.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 618 | 3 | 100% | 1947 | 730 | Central |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
St. Elmo exchanges by carrier
2 carriers hold the 3 exchanges assigned to St. Elmo's rate center. MCC Telephony LLC has the most, with 2. 2 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in St. Elmo can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| MCC Telephony LLC | 2 | 67% |
| Citizens Telecom CO Illinois-frontier Citizens -il | 1 | 33% |
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 St. Elmo
These are the central office codes NANPA records for St. Elmo. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2005. None were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 618 | 461, 510, 829 |
Source: NANPA utilized central office code file.
When St. Elmo's exchanges were assigned
The table groups St. Elmo's exchanges by the decade NANPA recorded them as assigned.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 1 | 50% |
| 2010s | 1 | 50% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
Rate centers and local calling in St. Elmo
Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. St. Elmo's numbers are rated to the ST ELMO rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a St. Elmo number.
If your business already has a St. Elmo number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
Businesses around St. Elmo
St. Elmo is outside any Census metro or micropolitan area, so the figures below are statewide. County Business Patterns counted 322,415 business establishments in Illinois in 2023, employing 5,661,761 people. The largest sectors by establishment count are professional, scientific, and technical services (37,946), health care and social assistance (37,597), and retail trade (35,801).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 10,622 | 189,552 | 17.8 |
| Full-service restaurants | 9,928 | 188,628 | 19.0 |
| Law offices | 6,918 | 52,434 | 7.6 |
| Physician practices | 6,775 | 106,595 | 15.7 |
| Residential remodelers | 6,209 | 15,603 | 2.5 |
| Dental offices | 5,781 | 37,948 | 6.6 |
| Insurance agencies and brokerages | 5,679 | 40,486 | 7.1 |
| Landscaping services | 5,034 | 23,331 | 4.6 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
A St. Elmo 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 St. Elmo 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 Illinois. 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 St. Elmo, IL?
618. All exchanges NANPA lists for St. Elmo are in 618.
How many phone companies have exchanges in St. Elmo?
2, holding 3 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing St. Elmo 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 St. Elmo?
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).