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AREA CODE · ILLINOIS

Area code 815

Area code 815 covers Rockford, Illinois. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: Illinois Major City: Rockford Central Time (CT) Overlay: 779/815
01 / WHERE IT IS

Where is area code 815?

Area code 815 is assigned to Rockford and the surrounding region in Illinois. Calls to numbers that start with 815 are routed to this area.

Area code 815 shares its territory with 779. Because it is an overlay, local calls require dialing all 10 digits.

Counties covered

Will CountyWinnebago CountyMcHenry CountyLaSalle CountyKankakee CountyDeKalb CountyStephenson CountyGrundy CountyWhiteside CountyIroquois CountyBureau CountyLee CountyOgle CountyLivingston CountyJo Daviess CountyCarroll County

Line types

  • Mobile 21.5%
  • Landline 78.5%
02 / MAP

Area code 815 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

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© OpenStreetMap contributors

03 / LOCAL TIME

Current time in Rockford

This area code is in the Central Time (CT) time zone.

Local timeRockford, IL--:--:--

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America/ChicagoLive
04 / HOW TO DIAL

How to call Rockford

WITHIN THE US815 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 815 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 815 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 815 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 815 555 0123
🇦🇺Australia0011 1 815 555 0123
🇯🇵Japan010 1 815 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 815

Share of the number blocks by carrier and line type.

Landline

AT&T
30%
Frontier Communications
26%
Lumen Technologies
13%
AERO NORTH COMMUNICATIONS
7%
Mediacom
3%
Others
21%

Mobile

Verizon Wireless
30%
AT&T Mobility
25%
T-MOBILE USA
22%
UScellular
14%
USA Mobility
8%
Others
2%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 815

786 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(815) 200 Landline La Salle Windstream CommunicationsPAETEC ITEL, LLC
(815) 201 Landline Sheridan BandwidthBANDWIDTH.COM CLEC, LLC - IL
(815) 202 Mobile Oglesby AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC - IL
(815) 203 Mobile Joliet USA MobilityUSA MOBILITY WIRELESS, INC.
(815) 204 Mobile Crystal Lake USA MobilityUSA MOBILITY WIRELESS, INC.
(815) 205 Landline Coal City Lumen TechnologiesCENTURYLINK COMMUNICATIONS, LLC
(815) 206 Landline Woodstock AT&TILLINOIS BELL TEL CO
(815) 207 Landline Joliet AT&TTELEPORT COMMUNICATIONS AMERICA, LLC - IL
(815) 208 Landline Fulton MediacomMEDIACOM TELEPHONY OF ILLINOIS, LLC - IL
(815) 209 Landline Rockford Lumen TechnologiesLEVEL 3 COMMUNICATIONS, LLC - IL

Showing 10 of 786 prefixes

07 / FAQ

Frequently asked questions about area code 815

Where is area code 815 used?
Area code 815 serves Rockford and the surrounding area in Illinois, including Will County, Winnebago County, McHenry County, LaSalle County, Kankakee County.
What city is area code 815 from?
The main city of area code 815 is Rockford, IL.
What time zone is area code 815 in?
Area code 815 is in the Central Time (CT) time zone (America/Chicago).
Is 815 an overlay area code?
Yes. It shares its territory with 779. In an overlay, every call requires dialing all 10 digits.
How do I call a number with area code 815 from the United States?
Dial the 10 digits: 815 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 815 number from another country?
Dial your country's exit code (or +), then 1, then 815 and the seven-digit number. From a mobile you can use +1 815 XXX XXXX.
Which carriers use area code 815?
Most landline blocks belong to AT&T and most mobile blocks to Verizon Wireless. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 815 for landlines, mobiles or both?
Both. About 78.5% of the number blocks are landline, 21.5% mobile.
How do I save a 815 number in WhatsApp or my phone?
Save it in international format: +1 815 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 815?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

Nearby area codes

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Other area codes in Illinois

217 · Springfield224 · Arlington Heights309 · Peoria312 · Chicago331 · Aurora447 · Danville464 · Tinley Park618 · Collinsville630 · La Grange708 · La Grange730 · Centralia773 · Chicago779 · Rockford847 · Northbrook872 · Chicago

View all Illinois area codes →