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Get a local business phone number in St. Jacob, IL

St. Jacob's area code, prefixes and carriers from NANPA records, and how to put a St. Jacob number in front of your customers.

Area code
618
Exchanges
2NANPA-assigned
Carriers
2
Population
2,874Census 2024 est.

St. Jacob area codes

St. Jacob township is a Census town in Madison County, Illinois, with an estimated 2,874 residents in 2024. All 2 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. Jacob may carry any of those codes depending on which have numbers available. St. Jacob 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 codes with exchanges in St. Jacob, IL
Area codeExchanges hereShareIn service sinceOverlay withTime zone
6182100%1947730Central

Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.

St. Jacob exchanges by carrier

2 carriers hold the 2 exchanges assigned to St. Jacob's rate center. Charter Ip Enabled Services, LLC has the most, with 1. 1 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.

Carriers holding exchanges in St. Jacob, IL
Carrier (NANPA operating company)ExchangesShare
Charter Ip Enabled Services, LLC150%
Home Tel. CO.150%

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. Jacob

These are the central office codes NANPA records for St. Jacob. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2018. None were assigned in 2020 or later.

Prefixes assigned in St. Jacob, IL
Area codePrefixes (NXX)
618640, 644

Source: NANPA utilized central office code file.

Rate centers and local calling in St. Jacob

NANPA ties every exchange to a rate center. For St. Jacob that is ST JACOB, so a number from one of these exchanges reads as local to people in and around St. Jacob.

Keeping an existing St. Jacob number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 618 when you pick it.

Businesses around St. Jacob

St. Jacob 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).

Selected industries in the St. Louis, MO-IL metro area, 2023
IndustryEstablishmentsEmployeesEmployees per establishment
Limited-service restaurants2,33445,28919.4
Full-service restaurants2,01949,93024.7
Agencies providing services for the elderly and persons with disabilities1,89816,5468.7
Physician practices1,78522,12612.4
Insurance agencies and brokerages1,5097,8395.2
Law offices1,39310,5097.5
Offices of real estate agents and brokers1,0992,5232.3
Landscaping services1,0927,5046.9

Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.

A St. Jacob number on Callata

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

Porting a number you already use in St. Jacob 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.

An 18-person team is the benchmark here, the rounded average establishment size in the St. Louis, MO-IL metro area. 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. Callata comes to $359.00 a month for 18 users ($99 a month with 5 users included, then $20 per additional user), below both.

Monthly list price for an 18-person team
Provider (plan)Pricing basisPer monthPer 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. Jacob, IL?

618. All exchanges NANPA lists for St. Jacob are in 618.

How many phone companies have exchanges in St. Jacob?

2, holding 2 exchanges between them, according to NANPA's 10/01/2026 file.

Can I keep my existing St. Jacob 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. Jacob?

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).