CallataGuidesGet a local business phone number in Fairfield, IL
Fairfield's area code, prefixes and carriers from NANPA records, and how to put a Fairfield number in front of your customers.
- Area code
- 618
- Exchanges
- 5NANPA-assigned
- Carriers
- 3
- Population
- 4,790Census 2024 est.
Fairfield area codes
Fairfield city is a Census place in Wayne County, Illinois, with an estimated 4,790 residents in 2024. All 5 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 Fairfield may carry any of those codes depending on which have numbers available. Fairfield 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 | 5 | 100% | 1947 | 730 | Central |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Fairfield exchanges by carrier
3 carriers hold the 5 exchanges assigned to Fairfield's rate center. Cellco Partnership d/b/a Verizon Wireless - Il has the most, with 2. 4 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Fairfield can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Cellco Partnership d/b/a Verizon Wireless - Il | 2 | 40% |
| Frontier North, INC. - Il | 2 | 40% |
| New Cingular Wireless PCS, LLC - Il | 1 | 20% |
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.
Fairfield phone prefixes
A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Fairfield. The earliest assignment date recorded in the file for these codes is 2001. None were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 618 | 516, 599, 842, 847, 919 |
Source: NANPA utilized central office code file.
How local numbers work in Fairfield
NANPA ties every exchange to a rate center. For Fairfield that is FAIRFIELD, so a number from one of these exchanges reads as local to people in and around Fairfield.
If your business already has a Fairfield number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
The local business market
Fairfield 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.
Business phone service in Fairfield
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.
If you already have a number in Fairfield, 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.
An 18-person team is the benchmark here, the rounded average establishment size in Illinois. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $540.00 a month and Ooma Office Pro $449.10. On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.
| 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 Fairfield, IL?
618. All exchanges NANPA lists for Fairfield are in 618.
How many phone companies have exchanges in Fairfield?
3, holding 5 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Fairfield 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 Fairfield?
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).