Introduction
Cicero, Illinois has carried the 464 area code since January 2022, and plenty of callers still assume it is a scam prefix. It isn't. It's a permanent second address for one of the busiest calling regions in the Midwest, and it works exactly the way 708 does. Businesses that get the mechanics wrong run into two avoidable problems: failed local calls and caller-ID flags that quietly hurt answer rates.
The 464 area code is a telephone overlay serving Cook and Will counties in Illinois, covering Cicero, Orland Park, Oak Lawn, Berwyn, and dozens of other Chicago-area suburbs. It shares the same geographic footprint as area code 708 rather than replacing it, and both codes have issued numbers side by side since launch. This guide covers where 464 sits on the map, how it actually differs from 708, why calls suddenly need ten digits, and how a business anywhere picks one up.
What Is the 464 Area Code, and Where Is It Located?
Area code 464 belongs to the North American Numbering Plan and was assigned to relieve Illinois' 708 region once its number supply started running low. Regulators call this an overlay: a second code layered onto an existing territory instead of splitting it into two separate regions.
That distinction matters more than it sounds. A split would have forced part of Cook County to change its numbers. An overlay changes nothing for existing 708 customers, since it simply hands the phone company a second pool of numbers to issue on new lines in the same towns.
464 has been assigned only to new numbers and new business accounts since its launch. A 708 number already in place isn't going anywhere. Geographically, the overlay spans the south and west suburbs of Chicago, reaching into Cook County and Will County. Cicero is the largest single city in the footprint, with a population over 80,000.
Cities and Counties Covered by 464
Orland Park, Tinley Park, Oak Lawn, Berwyn, Oak Park, and Chicago Heights round out the larger communities, and the full list runs to more than 90 towns and villages.
| Detail | Info |
|---|---|
| State | Illinois |
| Counties | Cook, Will |
| Largest city | Cicero (pop. 80,000+) |
| Overlay partner | 708 |
| Time zone | Central (CT) |
| Number format | +1 (464) XXX-XXXX |
| In service since | January 21, 2022 |
Neighboring Area Codes and ZIP Ranges
Neighboring codes ring the territory on every side: 219 to the southeast in Indiana, 312 downtown, 773 and 872 within the city itself, and 224/847 and 331/630 across the northern and western collar counties. ZIP codes across the region run roughly from 60104 to 60805.
Is 464 New, or Just an Overlay of 708?
Neither, exactly. Think of it less as a replacement and more as a second lane added to an already-busy road. Both 464 and 708 route calls to the same cities, the same exchanges, and the same carriers.
The practical difference only shows up when someone requests a brand-new number. Providers assign whichever code still has numbers left in that exchange, sometimes 708, increasingly 464. Existing customers are never renumbered, and there's no cost difference between the two. Here's what actually changes between the two codes, side by side:
| Area code 464 | Area code 708 | |
|---|---|---|
| Geographic territory | Identical | Identical |
| Assigned to | New numbers only | Existing lines, plus some new numbers |
| Dialing format | 10-digit mandatory | 10-digit mandatory |
| Call cost | No difference | No difference |
| Time zone | Central | Central |
| Treated as local calling one another? | Yes | Yes |
Short version: nothing changes for the person dialing, except which three digits appear first. Illinois regulators reserved this code back in 1999, more than two decades before it entered service. The same overlay model is common across the US — St. Louis's 557 area code stacks the same way alongside 314.
Why Does 464 Require 10-Digit Dialing, and What Time Zone Is It In?
Once a region gets a second area code, seven-digit dialing stops working for both codes, not just the new one. The FCC mandated 10-digit dialing — area code plus the seven-digit number — across the entire 708/464 territory starting October 24, 2021, three months ahead of 464's actual launch.
That single change is why a next-door call in Cicero now needs the full number, even between two 708 lines. It isn't a 464-specific quirk. It's what happens automatically the moment any territory adds a second area code.
Local calls stay local. Toll calls stay toll. Only the digit count changes. On the time zone front, 464 runs on Central Time, UTC-6 for most of the year and UTC-5 during daylight saving, matching the rest of the Chicago metro area. Businesses routing calls or setting IVR business-hours rules should build them on Central Time rather than Eastern, a common mix-up for teams unfamiliar with the region.
How to Get a 464 Area Code Number
Picking up a 464 number doesn't require a Chicago office, a physical SIM card, or U.S. residency. Most cloud phone providers, TKOS included, can provision one from a browser in minutes, following the same five steps regardless of where the business is actually based.
None of those steps change for a team based in Johannesburg, Lagos, or anywhere else outside the country. A U.S. area code on a properly built hosted phone system rings through to a laptop, mobile app, or desk phone wherever the team sits, backed by real wholesale voice infrastructure rather than consumer internet calling. Distance from Cicero has no bearing on call quality when the routing runs over an actual carrier backbone.
Will a 464 Number Get Flagged as Spam, and Why Do Businesses Want One?
Newer area codes take unfair heat here. Because 464 numbers are, on average, newer than long-established 708 lines, some carrier-side spam filters treat them with extra suspicion until they build up call history.
The real fix isn't waiting it out. It's STIR/SHAKEN, the caller-ID authentication framework — the FCC guide explains how carriers attest that a call genuinely originates from the number it claims to. A-level attestation, signed at the carrier rather than bolted on afterward, is what actually keeps a legitimate 464 number off a "Scam Likely" screen.
Spam risk aside, a 464 number simply reads as local to anyone in Cicero, Oak Lawn, or the broader south suburbs, and that still moves the needle on whether a call gets answered. Local numbers get picked up more often than out-of-area or toll-free ones, largely because the caller recognizes the area code as one of their own. For businesses already serving Cook or Will county residents, that's straightforward. For businesses expanding into the territory without opening an office there, a virtual 464 number is the fastest way to look established from day one.
Conclusion
464 isn't a mystery once the overlay mechanics are clear. It's a second pool of numbers layered onto the same 708 territory, not a new region, not a scam, and not a reason to expect a different bill. The only real behavior change is the 10-digit dialing rule, which applies across both codes rather than singling out the newer one. Everything else, from time zone to call cost to local trust, stays identical to any other Chicago-area suburb.
Businesses weighing a 464 number don't need a Cicero address to get one, and they don't need to guess at spam risk if the provider signs calls properly at the carrier level. TKOS issues local numbers across Illinois, including the 708 and 464 overlay, with carrier-level caller-ID authentication built in rather than bolted on after the fact. For a team based anywhere else in the world, that number behaves exactly like a local line to anyone who picks up in Cook or Will county.
