Illinois Reverse Phone Lookup

Reverse Phone Lookup

ThisNumber has over 28 million name and address records for about 23 million phone numbers, making it one of the best reverse phone lookup services for Illinois residents. Stop wondering who called you and start using this free lookup tool to identify the unknown callers, verify Illinois businesses, or research potential scam calls.

Identify Phone Number Location Using Illinois Area Codes

To identify the location of an Illinois phone number, you need to understand the North American Numbering Plan (NANP) structure that all Alabama numbers follow: +1 NPA NXX XXXX.

• +1 - Country code indicating the United States
• NPA - The area code reveals the geographic region where the number was originally assigned
• NXX - Central office code that locates the specific neighborhood and identifies the service provider
• XXXX - Subscriber number identifies the individual phone line within that local exchange

The area code (NPA) is your key to determining location. By matching the three-digit area code to Illinois's regional assignments, you can identify which part of the state the phone number originates from. Each area code corresponds to specific cities and counties throughout Illinois, making it possible to narrow down the caller's general location.

Here's a complete list of Illinois area codes with major cities:

For latest Illinois phone numbering regulations, contact George Light at the Illinois CC via [email protected] or 312-814-8591.

Illinois Phone Numbers

Illinois has approximately 18.3 million active phone numbers. Cell phones are the dominant type with 15.1 million users, while landlines have declined to 552,000 connections statewide. Internet phone services account for about 2.6 million numbers.

The vast majority of phone numbers in Illinois are mobile phones. This means tracing phone numbers can be more complex compared to traditional landlines due to decreased availability of public information.

Illinois Voice Subscriptions (in thousands):

Source: FCC Voice Telephone Services Report

Top 5 US Cell Phone Companies

Most phone numbers are cell phones, and most cell phone numbers come from the top three United States wireless companies. Here are the top five US Cell Phone Companies in Q1 2025:

• Verizon - 146 million customers
• T-Mobile US - 131 million customers
• AT&T Mobility - 118 million customers
• Boost Mobile - 7 million customers
• U.S. Cellular - 4.4 million customers

Robocalls and Unwanted Calls in Illinois

Illinois residents experienced a slight increase in unwanted calls in 2024, with complaints reaching 102,690. This is up from 96,379 in 2023 but still below the peak of 216,686 in 2021, according to the latest National Do Not Call Registry Data Book.

Key Facts for Illinois Residents:

• 56,038 of Illinois' 102,690 complaints involved automated robocalls, representing more than half of all unwanted call reports statewide.
• 7,908 complaints were for fraudulent "medical & prescriptions" schemes, followed by imposter scams (7,507) and debt reduction (7,050), showing these remain top threats to Illinois families.
• Over 10.8 million Illinoisans have registered their numbers on the Do Not Call Registry, demonstrating strong community engagement in call protection efforts.
• Active Registrations have risen to 10,870,557 demonstrating continued public participation.
• 33,277 complaints involved live callers, indicating that human-operated scam operations continue actively targeting the state.
• Illinois ranks #4 nationally for complaints per 100,000 population, reflecting a high level of complaints per capita compared to other states.

Verify Phone Number Owner to avoid Scam Calls Illinois Fraud Statistics

According to the Federal Trade Commission's 2024 data, phone calls and text messages make up 35% of all fraud contact methods nationwide:

• Phone calls: 19% of fraud reports (284,659 reports, $948M in losses)
• Text messages: 16% of fraud reports (246,784 reports, $470M in losses)

More than 1 in 3 fraud attempts happen through phone communication. Phone call fraud costs victims a median of $1,500 per case. Text message fraud costs a median of $1,000 per victim.

In 2024, Illinois residents reported 186426 fraud cases resulting in total losses of $318.1M, with a median loss of $400 per victim. With phone-based fraud representing such a significant portion of these cases, phone owner verification has become a critical consumer protection tool.

When you receive calls from unknown numbers, take a moment to research the caller's identity. Reverse phone lookup services allow you to search a phone number to find information about who's calling—including whether the number has been reported for fraudulent activity.

Received fraudulent calls or fallen victim to phone fraud? Report it immediately. Each report helps authorities identify fraud patterns and protect other consumers from similar scams.

Additional Contact:
Illinois Attorney General
Kwame Raoul
(312) 814-3000