CallataGuidesGet a local business phone number in Wilmington, IL
Wilmington's area codes, prefixes and carriers from NANPA records, and how to put a Wilmington number in front of your customers.
- Area code
- 779 / 815
- Exchanges
- 5NANPA-assigned
- Carriers
- 5
- Population
- 5,919Census 2024 est.
What area code is Wilmington, IL?
Wilmington township is a Census town in Will County, Illinois, with an estimated 5,919 residents in 2024. NANPA lists 5 exchanges for its rate center across 2 area codes; 779 has the most (3, 60%). 779 is part of an overlay with 815, so a new local number in Wilmington may carry any of those codes depending on which have numbers available. Wilmington is in the Central time zone.
According to NANPA's dialing-plan data, local calls within 779 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits.
Wilmington exchanges by carrier
5 carriers hold the 5 exchanges assigned to Wilmington's rate center. Teleport Communications America, LLC - Il has the most, with 1. 5 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.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Teleport Communications America, LLC - Il | 1 | 20% |
| Bandwidth.com CLEC, LLC - Il | 1 | 20% |
| AT&T Enterprises, LLC | 1 | 20% |
| Illinois Bell Tel CO | 1 | 20% |
| Level 3 Communications, 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.
Wilmington phone prefixes
Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Wilmington's rate center (WILMINGTON). The earliest assignment date recorded in the file for these codes is 2001. None were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 779 | 232, 257, 429 |
| 815 | 476, 926 |
Source: NANPA utilized central office code file.
When Wilmington's exchanges were assigned
Assignment dates show when each block of Wilmington numbers was added to the local supply.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 3 | 75% |
| 2010s | 1 | 25% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
What makes a number local to Wilmington
Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Wilmington's numbers are rated to the WILMINGTON rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Wilmington number.
If your business already has a Wilmington number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
Businesses around Wilmington
Wilmington is part of the Chicago-Naperville-Elgin, IL-IN metro area, home to 9.4 million people in 2024. County Business Patterns counted 248,519 business establishments in the Chicago, IL-IN metro area in 2023, employing 4,285,971 people. The largest sectors by establishment count are professional, scientific, and technical services (32,828), health care and social assistance (29,768), and retail trade (25,308).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 8,179 | 139,869 | 17.1 |
| Full-service restaurants | 7,371 | 149,532 | 20.3 |
| Law offices | 5,865 | 46,449 | 7.9 |
| Physician practices | 5,693 | 80,101 | 14.1 |
| Residential remodelers | 5,230 | 12,655 | 2.4 |
| Dental offices | 4,881 | 30,767 | 6.3 |
| Offices of real estate agents and brokers | 4,252 | 11,786 | 2.8 |
| General freight trucking companies (local) | 4,040 | 14,869 | 3.7 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Business phone service in Wilmington
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 Wilmington, 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.
The comparison below uses 17 users, the rounded average establishment size in the Chicago, IL-IN metro area. At list prices checked September 28, 2026, that is $424.15 a month on Ooma Office Pro and $510.00 on RingCentral RingEX Core. On Callata the same 17 people cost $339.00 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 | $339.00 | $4,068.00 |
| Quo (Starter) | $19.00 per user | $323.00 | $3,876.00 |
| Nextiva (Core) | $23.00 per user | $391.00 | $4,692.00 |
| Ooma (Office Pro) | $24.95 per user | $424.15 | $5,089.80 |
| Dialpad (Standard) | $27.00 per user | $459.00 | $5,508.00 |
| RingCentral (RingEX Core) | $30.00 per user | $510.00 | $6,120.00 |
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 Wilmington, IL?
Wilmington has exchanges in 779 and 815; 779 has the most.
How many phone companies have exchanges in Wilmington?
5, holding 5 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Wilmington 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 Wilmington?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 17 users come to $339.00 a month. For comparison, 17 users on RingCentral RingEX Core list at $510.00 a month (checked September 28, 2026).