Introduction
The 224 area code identifies phone numbers across Chicago's North Shore and northwest suburbs, and this guide breaks down exactly what territory it covers today.
Anyone tracing an unfamiliar call, or building a business presence outside the city, needs to know how this newer prefix works.
You will learn the history behind the 224 area code, its current coverage, the time zone it runs on, and the dialing rules now in effect. By the end, you will know exactly how to put a local Chicago-suburb number to work for your business.
- The 224 area code launched in 2002 as an overlay for the existing 847 prefix.
- It shares the exact same footprint as 847 across Cook, Lake, and McHenry counties.
- Ten-digit dialing has been mandatory in this overlay region since day one.
- Cloud VoIP lets any business claim a 224 number without opening a local office.
What Is the 224 Area Code?
Area code 224 is not a split from an older prefix — it is an overlay, meaning it shares the exact same geographic territory as area code 847 instead of replacing it.
Regulators added it in 2002 once 847 itself, activated in 1996 after splitting from area code 708, started running short on available numbers.
Because overlay codes stack a second prefix onto existing territory rather than dividing it, a home and its next-door neighbor can carry different area codes despite sitting on the same street.
That setup is exactly why what area code is 224 covers is identical to 847's original footprint across Chicago's northern suburbs.
- Type: overlay code, not a split
- Paired prefix: area code 847 (activated 1996)
- Overlay added: area code 224 (2002)
- Dialing rule: mandatory 10-digit local dialing since the overlay began
Counties and Cities the 224 Area Code Covers
The 224 area code covers Chicago's North Shore and northwest suburbs, spanning Cook, Lake, and McHenry counties. That footprint stretches from Evanston and Skokie near the city line out to Waukegan on the Wisconsin border and Elgin to the west.
Major cities carrying a 224 area code number include Evanston, Schaumburg, Arlington Heights, Waukegan, Highland Park, and Elgin, plus dozens of smaller suburban communities.
Schaumburg and Arlington Heights anchor a dense corporate corridor along the I-90 tech and insurance belt, while Highland Park and Evanston add affluent lakefront communities home to Northwestern University.
Businesses serving customers across the wider metro should also know about the 773 area code, which covers Chicago's North and West Sides and matters if your customer base reaches into the city itself.
Most new mobile numbers and small-business lines in the region now draw from 224, while area code 847 remains the older, more recognized prefix across these suburbs. That legacy status still carries weight with local customers reading a caller ID.
224 Area Code Time Zone and Dialing Rules
The 224 area code sits entirely inside the Central Time Zone, matching the rest of the Chicago metro. Central Standard Time (CST) runs UTC −6:00 from early November through mid-March.
Central Daylight Time (CDT) runs UTC −5:00 the rest of the year. That places Evanston one hour behind New York and two hours ahead of Los Angeles, a gap worth planning around for cross-country calls.
Because area code 224 shares its territory with 847, the same seven-digit sequence can exist under either code. Ten-digit dialing has been mandatory across the overlay region since 224 went live in 2002, and it still applies today.
Even a call between two offices on the same Schaumburg block needs the full prefix: (224) XXX-XXXX. International callers dial +1 (224) XXX-XXXX.
- Central Standard Time (CST): UTC −6:00, early November through mid-March
- Central Daylight Time (CDT): UTC −5:00, mid-March through early November
- vs. New York: one hour behind
- vs. Los Angeles: two hours ahead
- Local dialing format: (224) XXX-XXXX — 10 digits required
- International format: +1 (224) XXX-XXXX
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How to Get a Business Phone Number from Teloz
Teloz is a cloud phone system that hands out local numbers, including area code 224, without requiring hardware or a physical Illinois office.
Every number runs through a browser-based webphone, so a team scattered across the Midwest or across the country can share one business line.
Teloz also layers in an AI receptionist and an omnichannel contact center, so one number can answer calls, texts, and web chats from a single dashboard.
- 1. Visit teloz.com and start a free trial or request a demo.
- 2. Create your account using your business email address.
- 3. Choose a plan that fits your team's size and expected call volume.
- 4. Select your business number — pick your preferred area code, toll-free prefix, or local number.
- 5. Set up your team, call routing, and IVR in the browser-based dashboard.
- 6. (Optional) Configure the AI Receptionist, voicemail, and SMS settings.
- 7. (Optional) Start making and receiving calls from the webphone or connected devices.
How to Identify and Avoid 224 Area Code Scam Calls
The same local recognition that makes a 224 area code number valuable for businesses also makes it attractive to scammers. Caller ID spoofing software lets fraudsters display a fake number on a screen.
The call can originate anywhere in the world, borrowing the prefix's trust without any real connection to the Chicago suburbs.
Common scripts here include callers posing as utility billing agents or property tax officials demanding fees. Others pose as bank fraud investigators or tech support reps citing a well-known local company.
None of these callers demand instant payment by gift card or wire transfer, and a real 224 area code prefix on the screen proves nothing about who is calling.
The FCC's spoofing guide publishes ongoing guidance covering exactly these tactics and how to report them.
Letting unknown calls go to voicemail, screening with your carrier's free tools, and reporting suspicious numbers all reduce the odds of losing money to a spoofed call.
- Let unrecognized calls go to voicemail; legitimate callers leave a message.
- Never confirm personal or financial details to an unexpected caller.
- Enable free call-screening tools offered by most major carriers.
- Report suspicious calls to the FCC and FTC.
“The 224 area code tells an Evanston customer that the business calling them belongs here — and that recognition is worth more than any unfamiliar toll-free number.”
Why Businesses Choose a 224 Area Code Number
A local Chicago-suburb number tells an Evanston or Schaumburg customer the business belongs there, even if the team sits in another state.
That recognition drives higher answer rates, since an unfamiliar toll-free or out-of-state number is far more likely to be ignored than a prefix a customer already sees on friends' and neighbors' phones.
What area code is 224 tied to matters here: a dense corporate corridor and affluent lakefront suburbs anchor this market, so a local prefix builds trust faster than in a less commercial region.
Vendors and service businesses pitching Schaumburg or Highland Park clients gain instant credibility with a local listing on their website and invoices.
Pairing that identity with full contact center solutions built for growth helps a small team sound like an established local player rather than an outsider cold-calling into the market.
Cloud VoIP removes the old barrier to claiming a number in this prefix: the need for a physical Illinois address.
A remote sales team or a single founder elsewhere can activate a line in minutes and route every call to whichever device is closest at hand, whether that's a laptop, a mobile phone, or a desk phone back at headquarters.
That flexibility matters most during peak commuting hours, when call volume to suburban offices along the I-90 corridor spikes and a local number keeps response times fast.
Conclusion
The 224 area code has served Chicago's North Shore and northwest suburbs since 2002, overlaying the same territory as area code 847 rather than replacing it.
It covers Evanston, Schaumburg, Arlington Heights, Waukegan, and Highland Park, all inside the Central Time Zone. Ten-digit dialing is mandatory everywhere it operates, a rule that keeps area code 224 and 847 from colliding on the same number.
Knowing what area code is 224 helps residents trace unfamiliar calls and helps businesses decide whether a local Chicago-suburb presence makes sense.
For any business hoping to reach customers across Chicago's suburbs, claiming a 224 area code number is one of the fastest ways to build that local trust.
Cloud VoIP has removed every old barrier — no office lease, no hardware, no long provisioning wait — leaving only the decision to get started.
A local Evanston or Schaumburg number paired with modern call routing and an AI receptionist puts a small team on equal footing with an established local competitor. The next step is simply choosing a provider that can hand you a 224 area code number today.
📍 Ready to sound like a true Chicago-suburb local on every call? Claim your 224 area code number and start routing calls from any device in minutes. 👉 Get Your Business Number Today · 👉 Start Your Free Teloz Trial
