Chicago phone numbers, from the Loop to the collar counties.
Get a local Chicago number — downtown 312, neighborhood 773, citywide 872, or any suburban code from 708 to 815 — issued from SIPNEX's own NANPA allocation. CNAM registration rides along at no charge, outbound calls carry A-level STIR/SHAKEN signatures, and the typical order answers its first call today. Stock varies rate center by rate center; we verify your code the day you ask.
Chicago area codes, ring by ring.
| METRO | AREA CODES | COVERAGE |
|---|---|---|
| Chicago city | 312 · 773 · 872 | 312 is the downtown code — the Loop and the blocks around it. 773 has covered the neighborhoods since the 1996 split, and 872 overlays the whole city, in service since 2009. See the 312 area code guide. |
| South & near-west suburbs | 708 · 464 | Oak Park, Cicero, Oak Lawn, Tinley Park, Calumet City — 464 is the newest Chicago-area overlay, in service January 2022. |
| North & northwest suburbs | 847 · 224 | Evanston, Skokie, Arlington Heights, Schaumburg, Waukegan — 224 overlaid 847 in 2002. |
| West suburbs & DuPage | 630 · 331 | Naperville, Aurora, Wheaton, Downers Grove — 331 overlaid 630 in 2007. |
| Far outer ring | 815 · 779 | Joliet, Rockford, DeKalb, and north-central Illinois beyond the metro — 779 overlaid the original 815 in 2007. |
The overlays keep coming as the region exhausts its numbers: 464 over the 708 suburbs in January 2022 is the newest, after 872 over the city in 2009, 331 over 630 and 779 over 815 in 2007, and 224 over 847 in 2002. Confirm what's live before a campaign gets welded to one code — and treat every overlay as the same ground under a second name: an 872 is exactly as Chicago as a 312.
What a Chicago DID includes from day one.
Every Chicago code, one carrier
Loop, neighborhoods, collar counties — the numbers all come from SIPNEX's own NANPA allocation instead of being rented down a reseller chain that pads each rate center.
Same-day provisioning for most orders
Name the code, name the count; most Chicago orders are configured, registered, and answering within the business day. Only large multi-rate-center batches run longer.
CNAM registration included
During provisioning your 15-character business name is written into the CNAM database — included, not an upsell — and within 24 to 72 hours of propagation your calls display a name, not ten digits.
A-level STIR/SHAKEN attestation
Chicago DIDs are entered in SIPNEX's STIR/SHAKEN database and signed under our own SP-KI certificate, so calls leave at A-level — no reseller layer to demote them to B.
Carrier-direct, not an app subscription
With app providers, the Chicago number is a feature of a subscription you can never stop paying. With SIPNEX it's a carrier asset assigned to you, usable on any SIP platform you like.
Inbound and outbound together
Ring in, dial out — one Chicago number does both jobs on one trunk, with no secondary number class and no bolt-on fees.
Read local from the Loop to Naperville.
Chicagoans screen unfamiliar codes as hard as anyone, and the metro's geography gives you the counter: a 312 for the Loop, a 773 for the neighborhoods, an 847 or 630 when you're working the suburbs. Presenting the code each recipient already lives in — from a rotated pool sized so no single number overheats — is how the ring-by-ring map above becomes more conversations per hundred dials.
The pools are provisioned city and suburbs alike from SIPNEX's NANPA-allocated stock — CNAM registered, signed at the A level under our own certificate. Sizing, rotation cadence, and the compliance rules that bound the practice are walked through in the local presence dialing guide.
Keep the 312. Change everything behind it.
Send the LOA
One LOA and a current bill cover the paperwork for the Chicago numbers you're moving — SIPNEX drives everything after that.
We submit and schedule
The filing goes to the losing carrier under SIPNEX's name, with a Firm Order Commitment date locked in; standard Chicago ports run 7 to 14 business days.
Dial on new DIDs meanwhile
Fresh Chicago DIDs can be dialing the same day you order, which keeps campaigns alive while the legacy numbers work through the port.
Cut over, keep the number
The number lands on FOC day carrying routing, CNAM, and STIR/SHAKEN registration — all pre-staged — and porting a US number costs you nothing.
Who buys Chicago numbers, and why.
Downtown presence, neighborhood reach
Work the Loop from a 312, the North and South Sides from a 773, Schaumburg or Naperville from the right suburban code — familiarity on the display is what gets the call taken. See local presence dialing guide.
Attribution by phone number
When each billboard, ad, and landing page rings a different Chicago DID, the call log settles every argument about which channel produces. See call tracking service.
Expanding into Chicago
Taking a Loop sales office or a suburban branch? Get the local number onto your site and campaigns while the paperwork is still with the lawyers. See DID numbers service.
Call centers dialing Chicago
Build pools in the exact codes your Chicago lead lists contain, rotate dials so reputations stay healthy, and let A-level signing vouch for every call. See VICIdial carrier.
Chicago number questions, without the runaround.
How do I get a Chicago phone number for my business?
What is the difference between 312, 773, and 872 in Chicago?
Can I still get a 312 Chicago number, or only 872?
Do I need a Chicago office to get a Chicago number?
Can I port my existing Chicago numbers to SIPNEX?
Which area codes cover the Chicago suburbs?
Local numbers in other markets
Boston phone numbers · California phone numbers · Florida phone numbers · Los Angeles phone numbers · New York phone numbers · Texas phone numbers
A Chicago number live before close of business.
Give us the code — 312, 773, 872, or a suburban ring — plus the quantity and the endpoint that should ring. Typical orders draw from NANPA-allocated inventory and go live within the day, CNAM registered and A-level signed, routed to your SIP trunk or PBX. Rate-center stock gets confirmed the day you ask.