Area Code for Chicago

Chicago has three city area codes — 312 (downtown), 773 (neighborhoods), and 872 (overlay) — plus a ring of suburb codes covering every direction out of the city.

Whether you’re decoding a Chicago number on your screen, choosing a local number for your business, or just curious why your Loop contact has a different code than your Wicker Park friend, this guide covers every Chicago area code with the history, neighborhood maps, and business context you need.

What’s the area code for Chicago?

Chicago proper is served by three area codes assigned under the North American Numbering Plan (NANP):

Code	Established	Coverage	Notes
312	1947	Chicago Loop, River North, Streeterville, Near North Side, Gold Coast, West Loop, South Loop	Original NANP code; smallest geographic footprint; most prestigious
773	1996	All Chicago city limits outside the 312 enclave	Covers the majority of Chicago’s land area and population
872	2009	Overlay of both 312 and 773	Requires 10-digit dialing; no fixed geographic identity

All three codes share the same time zone: Central Time (CT), UTC−6 in winter and UTC−5 in summer.

A quick rule of thumb: if a number starts with 312, the business is almost certainly in or near the Loop. If it’s 773, it’s a Chicago city number — just not downtown. If it’s 872, it’s Chicago but newer.

Chicago area codes by neighborhood and suburb

312 — The Loop and downtown core

Area code 312 is a geographic enclave. Its boundaries run roughly from North Avenue on the north to 35th Street on the south, Western Avenue on the west, and Lake Michigan on the east.

Neighborhoods covered by 312 include:

• The Loop — Chicago’s central business district, city hall, the Civic Opera House
• River North — galleries, agencies, restaurants
• Streeterville — Northwestern Memorial Hospital, Navy Pier corridor
• Near North Side — Magnificent Mile, upper Michigan Avenue
• Gold Coast — historic residential, luxury hotels
• West Loop — tech companies, restaurant row, Google Chicago offices
• South Loop — Soldier Field, Museum Campus area

Area code 312 is one of the smallest area codes in the United States by land area — it covers only a few square miles.

773 — Chicago’s neighborhoods

Area code 773 covers the entire Chicago city limit that falls outside the 312 enclave. That’s the overwhelming majority of Chicago’s 234 square miles and most of its population.

Key 773 neighborhoods include:

• North Side: Lincoln Park, Lakeview, Andersonville, Rogers Park, Uptown
• Northwest Side: Logan Square, Wicker Park, Bucktown, Avondale, Albany Park, Jefferson Park
• West Side: Humboldt Park, Austin, Garfield Park, Pilsen, Little Village
• South Side: Hyde Park, Bridgeport, Bronzeville, Englewood, Beverly, Chatham
• Southeast Side: South Shore, Pullman, East Side

Universities with 773 numbers include the University of Chicago, DePaul, and Loyola.

872 — The overlay

Area code 872 covers the same territory as 312 and 773 combined. It was introduced because both codes were nearing exhaustion. New numbers assigned in Chicago today are often 872. The code has no cultural cache — it simply means “Chicago.”

Suburb area codes by ring

Code	Overlay	Coverage	Key Cities
708	464	South & inner west suburbs	Oak Park, Cicero, Oak Lawn, Orland Park, Evergreen Park
847	224	North & northwest suburbs	Evanston, Waukegan, Des Plaines, Schaumburg, Lake County
630	331	Western suburbs (DuPage/Kane)	Naperville, Aurora, Wheaton, Downers Grove
815	779	Outer northern Illinois	Joliet, Rockford, DeKalb, Kankakee

Note: none of the suburb codes serve Chicago city limits. A 708, 847, 630, or 815 number is a suburb number — not a Chicago city number.

History of Chicago area codes

Chicago’s area code story mirrors the city’s growth from industrial metropolis to sprawling metro region.

1947 — 312 is born. When AT&T engineers designed the North American Numbering Plan (NANP), they assigned area code 312 to northern Illinois. It was one of the original 86 NPAs. At the time, a single code covered Chicago and its surrounding region with capacity to spare.

1989 — 708 splits off the suburbs. Population growth and the explosion of fax machines and early modems exhausted 312’s numbering capacity. The solution was to peel the suburbs away. Area code 708 was assigned to Chicago’s south and inner west suburbs, leaving 312 to cover city and immediate northern suburbs.

1996 — 773 splits Chicago itself. By the mid-1990s, even the city-only 312 faced exhaustion. On October 11, 1996, Chicago became one of the few US cities to be split between two area codes. The Loop and downtown kept 312; the rest of the city became 773. Simultaneously, the northern suburbs carved off as 847.

1996–2007 — Suburban overlays multiply. Western suburbs got 630 in 1996. As each primary code filled up, the Illinois Commerce Commission (ICC) ordered overlays rather than further splits: 224 overlaid 847 in 2002, 331 overlaid 630 in 2007, and 779 overlaid 815 in 2007.

2009 — 872 overlays Chicago. On November 7, 2009, area code 872 launched as a full overlay of both 312 and 773. Ten-digit dialing became mandatory for all Chicago local calls.

2022 — 464 overlays 708. The inner suburb ring’s 708 code received its own overlay, completing Chicago’s numbering picture as of today.

312 vs 773: the Chicago prestige split

No other American city has a downtown-vs-neighborhoods code split that carries as much cultural weight as Chicago’s 312/773 divide.

312 is Chicago’s 212. Just as New Yorkers prize a 212 Manhattan number for its scarcity and history, Chicago businesses prize 312 for the same reasons. Spokeo named 312 one of the top 10 most prestigious area codes in the United States.

The Loop’s 312 is sought after by:

• Law firms — Clark Street and LaSalle Street legal corridor
• Financial services — Chicago Mercantile Exchange, trading firms, banks
• Advertising and PR agencies — Michigan Avenue and River North creative shops
• Major corporations — Companies headquartered downtown maintain 312 main lines
• Iconic Chicago restaurants — A 312 reservation line signals establishment status

The supply is genuinely constrained. Area code 312 covers only a few square miles, and its number pool has been largely assigned since the 1990s. Getting a new 312 number now typically means acquiring one through number porting or from a provider with secondary inventory.

773 is where Chicago lives. The 773 code lacks 312’s prestige but has its own identity: it’s the code of neighborhoods, community, and authentic Chicago. A 773 number signals a local business embedded in a neighborhood rather than a downtown tower. For businesses targeting Chicago residents — medical practices, restaurants, contractors, schools — 773 may actually signal more neighborhood relevance than the corporate 312.

872 is neutral. New businesses that can’t source a 312 or 773 number often land on 872. It’s functional but carries no particular cultural signal either way.

Chicago area code spam and scams

Chicago area codes are frequently spoofed by scammers who exploit local caller ID to increase answer rates. Common patterns targeting Chicago numbers include:

• IRS impersonation calls — callers spoofing 312 numbers claim to be IRS agents threatening arrest for unpaid taxes. The IRS never initiates contact by phone — see IRS guidance on tax scams.
• Jury duty scams — reported in Cook County and suburban areas (often spoofing 847), callers claim you missed jury duty and demand payment via gift cards or wire transfer to avoid arrest.
• Utility shutoff scams — callers impersonating ComEd or Peoples Gas threaten immediate power or gas shutoff unless payment is made by phone.

These calls work because a local 312 or 773 number looks like it could be a real Chicago business. STIR/SHAKEN (Secure Telephone Identity Revisited / Signature-based Handling of Asserted information using toKENs) is the FCC-mandated framework that combats this. Carriers authenticate outbound calls and assign an attestation level — A (fully verified), B (partial), or C (gateway/unverified).

Spoofed scam calls typically receive C-attestation or no attestation at all, triggering “Spam Likely” labels on modern smartphones. When you get a Chicago business number through DialPhone, outbound calls carry A-attestation — the highest trust level — so your calls reach customers as verified, not flagged.

See the FCC’s guidance on caller ID spoofing: fcc.gov/consumers/guides/spoofing-and-caller-id.

For a deeper explanation of the authentication framework, see our STIR/SHAKEN glossary entry.

How to get a Chicago business phone number

Getting a Chicago 312, 773, or 872 number for your business takes under 10 minutes through a cloud VoIP provider. No Chicago office required.

Step 1: Choose your area code. Decide whether 312 (downtown prestige), 773 (neighborhood relevance), or 872 (general Chicago) fits your brand. 312 inventory is limited — check availability first.

Step 2: Sign up with a VoIP provider. DialPhone lets you search available Chicago numbers by area code during signup.

Step 3: Assign the number to users or a team. Route the Chicago number to your mobile, desktop app, or a team queue. Set up a voicemail greeting, call menu, or AI receptionist as needed.

Step 4: Configure outbound caller ID. Set your Chicago number as the outbound caller ID so calls you make display the local number — not an 800 number or your personal cell.

Step 5: Port existing numbers if needed. If you already have a Chicago number with another carrier, you can bring it to DialPhone through number porting (typically 2–5 business days for US local numbers).

See DialPhone pricing for plan details, or start a free trial to claim your Chicago number today.

For the full porting walkthrough, see our number porting guide.

Famous companies in Chicago area codes

Chicago’s area codes map to the economic geography of one of the world’s great business cities.

312 — The Loop’s corporate flagship numbers:

• Chicago Mercantile Exchange (CME Group) — 312 main line, the world’s largest derivatives marketplace
• Tribune Media / Chicago Tribune — legacy 312 numbers from the Tribune Tower on Michigan Avenue
• Major Chicago law firms — Kirkland & Ellis, Sidley Austin, and other Clark Street firms maintain 312 lines
• Chicago City Hall — 312, naturally

630 — Western suburb headquarters:

• McDonald’s Corporation — headquartered in Oak Brook, DuPage County; 630 main numbers
• Ace Hardware — Oak Brook headquarters, 630

847 — North suburb Fortune 500 base:

• Walgreens Boots Alliance — headquartered in Deerfield, 847
• Baxter International — Deerfield, 847
• Abbott Laboratories — Abbott Park, Lake County, 847

Other codes:

• United Airlines — Chicago O’Hare–adjacent HQ; mix of 872 and 630 depending on department
• Boeing (Chicago executive offices, before Virginia relocation): 312

Illinois’s industry mix — dominated by Finance, Healthcare, and Manufacturing — means that a Chicago area code signals B2B credibility. A 312 number for a financial services firm or law practice carries immediate regional authority.

Chicago area code FAQ

Chicago area code FAQ

What is the area code for Chicago? +

Chicago uses three area codes. Area code 312 covers downtown Chicago — the Loop, River North, Streeterville, and the Near North Side. Area code 773 covers the rest of Chicago city limits: the North Side, South Side, and West Side neighborhoods. Area code 872 is an overlay introduced in 2009 that covers the same geography as both 312 and 773.

New numbers assigned in Chicago today are often 872. Established businesses in the Loop typically hold 312 numbers, while residential and neighborhood addresses tend to have 773.

Is 773 a Chicago area code? +

Yes. Area code 773 is a Chicago city area code created in 1996 when the city was split from the original 312 enclave. It covers all Chicago neighborhoods outside the downtown core — Lincoln Park, Lakeview, Logan Square, Wicker Park, Pilsen, Hyde Park, Rogers Park, and most of the South and West Sides.

Despite its large geographic footprint, 773 is a genuine Chicago city code, not a suburban one. Suburbs have their own separate codes: 708, 847, 630, and others.

What is the difference between 312 and 773 area codes? +

The geographic split: 312 is an enclave covering just the downtown core (roughly bounded by North Avenue, Western Avenue, 35th Street, and Lake Michigan). Area code 773 covers the rest of Chicago's city limits.

Culturally, 312 carries prestige. Law firms, financial institutions, advertising agencies, and major Chicago corporations prize 312 numbers because they signal a downtown business address. A 312 number is Chicago's equivalent of New York's 212 — scarce and sought after. Area code 773 is the everyday code for residential Chicago, universities, and neighborhood businesses.

What are the Chicago suburb area codes? +

Chicago's suburban ring uses six primary codes. Area code 708 covers south and inner west suburbs including Oak Park and Orland Park (overlay: 464). Area code 847 covers north and northwest suburbs — Evanston, Waukegan, and Lake County (overlay: 224). Area code 630 covers western suburbs in DuPage and Kane counties including Naperville and Aurora (overlay: 331). Area code 815 covers outer northern Illinois including Joliet and Rockford (overlay: 779).

None of these codes serve Chicago city limits — they are suburb-only.

When did Chicago get the 872 area code? +

Area code 872 launched on November 7, 2009, as an overlay for both 312 and 773. The Illinois Commerce Commission (ICC) ordered the overlay to relieve number exhaustion without forcing existing customers to change their numbers. When 872 launched, ten-digit dialing became mandatory across Chicago — even local calls require the full 10-digit number.

Can I get a Chicago 312 or 773 number without a physical Chicago office? +

Yes. Virtual (VoIP) phone numbers are not tied to a physical address. A business anywhere in the US can get a Chicago 312 or 773 number through a cloud phone provider and route calls to any device. DialPhone assigns available Chicago numbers in minutes — no Chicago office, no hardware, no contract required.

The number will ring on your mobile, desktop app, or team queue wherever you are. Outbound calls display the Chicago number as caller ID.

Are 312 calls spam? +

Not inherently. A 312 number from a legitimate business is not spam. The issue is spoofing — scammers fake a local 312 or 773 caller ID to increase answer rates. Legitimate carriers implement STIR/SHAKEN caller authentication. When you get a 312 number through DialPhone, calls carry A-attestation — the highest STIR/SHAKEN trust level — so recipients see a verified caller ID instead of 'Spam Likely.'

If you receive an unexpected 312 call claiming to be the IRS, a court, or a utility threatening shutoff, that is almost certainly a spoofed scam call. The IRS never initiates contact by phone.

Get a Chicago business number

A verified Chicago 312, 773, or 872 number builds instant local trust — whether you’re a national company opening the Chicago market or a local business that wants its calls answered instead of screened.

DialPhone provides Chicago numbers with STIR/SHAKEN A-attestation, AI receptionist, call recording, and SMS — on a single plan with no hardware.

Start your free trial → | See all plans →

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Related resources:

• 312 area code landing page
• 773 area code landing page
• Illinois area codes
• DialPhone business phone
• AI receptionist for Chicago businesses
• Number porting guide