464 Area Code: Chicago Suburbs and Illinois Phone Guide

Introduction

If you receive a call from a number beginning with 464, it originates from the south or west suburbs of Chicago — one of the most densely populated metropolitan rings in the United States. Area code 464 functions as a full all-services overlay for the established 708 prefix, sharing its entire suburban Cook County territory without any geographic division between the two codes.

Whether you are a business establishing a local Chicago suburban presence, a resident researching an unfamiliar 464 call, or curious about how Illinois manages telephone numbering across the region, this guide explains where 464 reaches, how it came to exist, the dialing rules that apply, and how to protect yourself from 464 scam calls.

Quick answer: Area code 464 covers Chicago's south and west suburbs, overlaying area code 708 across the same suburban Cook County territory. It serves communities including Cicero, Berwyn, Oak Park, Oak Lawn, Orland Park, Tinley Park, Harvey, and Calumet City. The entire coverage area falls within the Central Time Zone. Existing 708 numbers remain permanently active — new subscribers may receive either a 708 or 464 number.

464 area code at a glance

Area code 464 is Chicagoland's newest suburban telephone prefix, introduced as an all-services overlay for area code 708. It covers the same geographic region that 708 has served since 1989 — Chicago's immediate south and west suburbs — with no boundary separating the two codes. Any existing 708 number remains active exactly as it was; 464 is assigned only to newly activated lines.

Much like the 463 area code, which was introduced as Indianapolis's second telephone prefix when 317 alone could no longer meet demand, 464 addresses the same pressure that decades of suburban growth placed on the original Chicago-area 708 prefix.

Where the 464 area code reaches

The 464 area code covers Chicago's south and west suburban ring — a dense, economically diverse region stretching from the near west suburbs immediately adjacent to the city limits all the way to the southern collar county border with Will County.

Major cities served:

• Cicero — One of the most densely populated suburbs in the United States, directly west of Chicago's city limits
• Berwyn — A vibrant west suburban community known for its arts scene, architecture, and diverse population
• Oak Park — The historic village that was the birthplace of both Frank Lloyd Wright and Ernest Hemingway
• Calumet City — A major south suburban commercial hub at the Illinois–Indiana border
• Harvey — An industrial south suburban center with deep roots in Chicago's steel and rail manufacturing history
• Oak Lawn — Home to Advocate Christ Medical Center and one of the southwest suburbs' busiest commercial districts
• Orland Park — A large southwest suburban township with major retail centres and corporate campuses
• Tinley Park — One of Illinois's most popular residential suburbs, anchored by the Hollywood Casino Amphitheatre entertainment complex

Counties in the 464/708 service area:

The entire 464 coverage area observes Central Time (UTC−6 in winter, UTC−5 during DST). When scheduling calls between the 464 area and Eastern Time cities such as Indianapolis or Philadelphia, keep in mind that Chicago's suburbs run one hour behind.

How the 464 area code was created

The story of 464 begins with area code 312, which was assigned to the entire Chicago metropolitan region in 1947 as part of the original North American Numbering Plan. For over four decades, 312 alone served both Chicago's city core and its expanding suburban ring.

In 1989, rapid suburban growth made the split inevitable. The 312 area code was retained for downtown and central Chicago, while 708 was created to serve the south and west suburbs. This gave the suburban communities their own dedicated prefix — and for years, it was more than sufficient.

The 1990s and 2000s changed everything. Mobile phones, pager services, fax lines, internet dial-up numbers, and eventually VoIP subscriptions multiplied the demand for phone number combinations far beyond what original planners had anticipated. The south and west suburbs, with their combination of dense residential neighborhoods and active commercial corridors, placed especially heavy demand on 708's available numbers.

The North American Numbering Plan Administration (NANPA) oversees area code resource management across the United States and Canada and works with state-level regulators — in Illinois, the Illinois Commerce Commission — to approve relief measures when a code approaches exhaustion. When forecasts confirmed that 708 was approaching depletion, regulators approved the 464 overlay rather than a geographic split, protecting all existing 708 customers from having to change their numbers.

Key milestones:

• 1947 — Illinois assigned area code 312 for the entire Chicago metro region
• 1989 — 312 split; area code 708 created for Chicago's south and west suburbs
• 1990s–2000s — Mobile and broadband demand accelerates 708 number depletion
• 2010s — Forecasts confirm 708 approaching exhaustion
• Early 2020s — 464 introduced as an all-services overlay for 708

Dialing rules for 464 numbers

Because 464 overlays 708 across the same geographic territory, ten-digit dialing is mandatory for all calls in the region — including calls between neighbors in the same suburb.

Ten-digit dialing became a requirement across the 708/464 region before 464 was officially activated, giving residents time to update saved contacts before the new code went live. Any speed-dial entry using only the seven-digit local number will fail to connect without the area code prefix.

Time zone tip: The entire 464 service area operates on Central Time — one hour behind Eastern Time (Indianapolis, Philadelphia), two hours behind Atlantic Time, and one hour ahead of Mountain Time. Keep this difference in mind when scheduling calls with contacts in other zones.

Why get a 464 area code number

The south and west Chicago suburbs represent one of the most commercially active metropolitan rings in the United States, serving more than 2.5 million people across healthcare, retail, manufacturing, and logistics sectors. A 464 number places your business directly inside this market with an instantly recognizable local prefix.

Key reasons to choose a 464 area code number:

• Suburban Chicago credibility — Residents of Chicagoland's south and west suburbs are significantly more likely to answer calls from 708 or 464 prefixes than from unfamiliar out-of-state numbers
• Healthcare corridor — Advocate Christ Medical Center in Oak Lawn and a network of regional health systems across the 464 territory create a dense and active B2B healthcare market
• Retail and commercial density — Orland Square Mall, the Harlem Avenue corridor, and southwest suburban commercial strips collectively draw tens of millions of annual visitors, making local number recognition especially valuable
• Manufacturing and logistics — The south suburban area retains a significant industrial presence connected to Chicago's rail network and the I-80/I-294 freight corridor, with strong demand for local vendor relationships
• Virtual reach — Just as businesses target Central Illinois customers through a 447 area code number without a physical Bloomington office, a 464 number lets you connect with Chicago's densest suburban market from any device and any location

Staying safe from 464 scam calls

As 464 numbers become more common across Chicagoland's south and west suburbs, fraudsters have begun spoofing them to appear local and trustworthy. Neighbour spoofing — displaying a 464 number matching your own area code prefix — is especially effective in a region where both 708 and 464 are recognized as authentic Chicago suburban numbers.

Common 464 scam types to watch for:

• IRS impersonation — Callers threaten immediate arrest for unpaid taxes and demand payment by gift card, wire transfer, or cryptocurrency
• Social Security suspension fraud — Automated messages state that your Social Security number has been flagged and require immediate verification to avoid account suspension
• Utility shutoff threats — Callers posing as ComEd or Nicor Gas demand same-day payment to prevent electricity or gas service disconnection
• Vehicle warranty fraud — Pre-recorded calls offering extended car warranty plans targeting the south and west suburbs' large commuter household base
• Medicare and benefits fraud — Fake government representatives targeting the south suburbs' retiree population with bogus Medicare plan updates or free medical equipment offers

How to protect yourself:

• Let unknown 464 calls go to voicemail and verify before returning them
• Never provide financial details, Social Security numbers, or account credentials in response to an unsolicited inbound call
• Verify any organization by calling the number listed on its official website
• Report suspicious 464 calls to the FTC at reportfraud.ftc.gov

No legitimate utility company, government agency, or financial institution will demand immediate payment by gift card or wire transfer during an unsolicited telephone call.

Key takeaways

• The 464 area code covers Chicago's south and west suburbs, overlaying area code 708 across the same suburban Cook County territory
• It was introduced in the early 2020s as an all-services overlay after 708 approached number exhaustion, following approval by Illinois regulators and NANPA
• The entire 464 area observes Central Time — one hour behind Eastern Time and one hour ahead of Mountain Time
• 10-digit dialing is mandatory throughout the 708/464 region for all local and long-distance calls
• The regional economy is anchored by healthcare, retail, manufacturing, and a major logistics corridor along I-80/I-294
• All 708 numbers remain permanently active — 464 is assigned only to new telephone lines going forward
• Top scam types include IRS impersonation, Social Security fraud, utility shutoff threats, vehicle warranty calls, and Medicare fraud

Conclusion

Area code 464 is the natural evolution of a suburban telephone network that has grown too large and too connected for a single prefix to carry alone. From the arts districts of Oak Park and Berwyn to the healthcare corridors of Oak Lawn and the industrial south suburbs, Chicago's south and west suburban ring has built one of the Midwest's most economically diverse and densely populated suburban landscapes.

Whether you receive a 464 call, need to reach a south suburban Chicago business, or are considering a local number for your own operations, understanding 464 and its relationship with 708 gives you a complete picture of how one of America's great metropolitan suburbs communicates today.

Frequently asked questions