The 224 area code overlays 847 across Chicago's North Shore and northwest suburbs — Schaumburg, Waukegan, Evanston, Northbrook, and Deerfield. Home to Fortune 500 headquarters, Northwestern University, and one of the country's densest pharma and insurance corridors, this is one of the newest Illinois area codes and one of its most economically concentrated. Learn where 224 is located, how the 847 overlay works, the Central Time zone, how to spot 224 spam calls, and how to get a 224 number for your business.
Few Illinois area codes pack in as much corporate weight per square mile as 224. Introduced in 2009 as an overlay to 847, it now shares the same footprint — the North Shore and northwest suburbs of Chicago, from Waukegan and Evanston down through Schaumburg, Northbrook, and Deerfield. It is a young code by area-code standards, but the territory it covers is anything but: this is Fortune 500 headquarters country, home to Northwestern University, and one of the most concentrated pharmaceutical and insurance corridors in the Midwest.
Whether you just got a call from 224 area code and want to know where is 224 area code, you are opening a location in the northern Chicago suburbs and need to confirm what is 224 area code, or you are comparing 224 vs 847 area code before choosing a business number, this guide covers the full footprint, the overlay mechanics, the 224 area code time zone, spam-call patterns, and exactly how to get a 224 number.
| Detail | Value |
|---|---|
| State | Illinois |
| Primary city | Schaumburg (corporate hub) |
| Also covers | Waukegan, Evanston, Arlington Heights, North Chicago, Northbrook, Deerfield, Vernon Hills |
| Counties | Lake, Cook, McHenry, Kane |
| In service since | 2009 (overlay only — no standalone territory) |
| Underlying code | 847 (in service since 1996; same footprint exactly) |
| Time zone | Central Time (CT) |
| Country | United States (224 area code USA) |
That "overlay only" row is the key fact most searches are really asking about: 224 does not have its own separate territory. Every square mile of the 224 footprint is also inside 847 — the two codes were layered on top of each other in 2009 when 847's original supply of numbers ran out.
The 224 area code location spans four counties north and northwest of downtown Chicago: Lake, Cook, McHenry, and Kane. Waukegan, the Lake County seat, is the largest city in the footprint. From there the territory runs south through North Chicago, Northbrook, and Deerfield, west into Schaumburg and Arlington Heights, and east along the lakefront through Evanston — home to Northwestern University.
One clarification worth addressing directly: searches for 224 area code california occasionally assume it is a West Coast code. It is entirely in 224 area code illinois — the northern Chicago suburbs, on Central Time, with no presence outside Illinois.
Residents and businesses in the 224/847 footprint are not short on Fortune 500 neighbors. Deerfield is home to Baxter International's headquarters; Northbrook hosts Allstate Insurance; Deerfield and North Chicago sit inside Abbott Laboratories' and AbbVie's corporate footprint; and Deerfield also anchors Walgreens' corporate presence. Evanston, meanwhile, is defined by Northwestern University — one of the country's top research institutions and a major employer in its own right.
For a business opening an office or a sales desk in this corridor, a 224 number signals membership in one of the wealthiest and most corporate-dense suburban zones in the country — a different identity than a 312 Chicago number, which reads as downtown Loop rather than North Shore suburban.
Because 224 and 847 are true overlays — not a geographic split — the two codes cover exactly the same ground. Here is how they compare:
| Code | Introduced | Coverage | Character |
|---|---|---|---|
| 847 | 1996 | North & northwest Chicago suburbs | Original code — longer-established local identity |
| 224 | 2009 | Overlay — identical geography to 847 | Newer code, assigned once 847 numbers ran low |
The 224 area code time zone is Central Time — CST (UTC−6) in winter, CDT (UTC−5) during daylight saving. That is the same clock as Chicago, Milwaukee, and Minneapolis: one hour behind New York, two hours ahead of Los Angeles.
Provisioning a 224 phone number is a standard DID setup, but the exchange you pick still carries a local signal. Schaumburg and Arlington Heights prefixes read as the corporate and retail west side of the corridor; Waukegan and North Chicago prefixes read as the Lake County industrial and healthcare core; Evanston and Northbrook prefixes read as the university and insurance-anchored east side.
A 224 area code on caller ID does not confirm the caller is actually in Illinois — caller ID spoofing lets anyone display any number. Most 224 calls are legitimate: North Shore businesses, Northwestern-affiliated contacts, and healthcare or insurance callers tied to the corridor's large employers. But the density of pharma, insurance, and university institutions in the footprint also makes it a target for impersonation scams.
If you receive a suspicious 224 call, let it go to voicemail, never share personal or banking information unprompted, and report fraud to the Illinois Attorney General Consumer Protection Division and the FTC's National Do Not Call Registry.
The 224 area code covers one of the most corporate-dense corners of the Midwest — Baxter and AbbVie in Deerfield, Allstate in Northbrook, Walgreens' corporate presence, and Northwestern University in Evanston, all inside a single overlay shared with 847. It is one of Illinois's newest codes, but the territory it shares carries outsized economic weight.
For any business establishing a presence in the North Shore or northwest Chicago suburbs — from Schaumburg's corporate corridor to Evanston's university district — a 224 number is a direct, local-sounding way to reach that market, with no physical Illinois office required.
The 224 area code is located in northeastern Illinois, covering the North Shore and northwest suburbs of Chicago across Lake, Cook, McHenry, and Kane counties — including Waukegan, Schaumburg, Evanston, Arlington Heights, and Northbrook.
Yes. The 224 area code is a fully legitimate US telephone area code administered by NANPA. It was introduced on November 7, 2009 as an overlay to the 847 area code in northeastern Illinois.
Both codes serve exactly the same geographic territory — the North Shore and northwest Chicago suburbs. 847 was the original code, established in 1996, while 224 was added in 2009 as an overlay once 847 numbers ran low. Neither code has its own separate territory.
The 224 area code operates in the Central Time Zone — UTC−6 during Central Standard Time (November to March) and UTC−5 during Central Daylight Time (March to November).
Not necessarily. 224 is a legitimate Illinois area code, but scammers use caller-ID spoofing to display fake 224 numbers, particularly in neighbor-spoofing and impersonation scams. If you receive an unexpected 224 call, let it go to voicemail first and verify independently before sharing any information.
Yes. Through a virtual VoIP provider like Ajoxi, you can get a 224 number and operate it from anywhere in the world, forwarding calls to any device — no physical Illinois office required.
AI receptionists, wholesale routes, virtual numbers — built on one platform with transparent pricing and a 24/7 NOC.
