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Area Code 779 Location & Details

State / Region: Illinois • Country: United States

Major Cities Covered: Joliet, Rockford, Plainfield, Crystal Lake, Romeoville, Dekalb, Mchenry, New Lenox, Lockport, Woodstock

Standard Dial Format
+1 (779) XXX-XXXX
Country Code: +1 (NANP Format)
What State is Area Code 779?
IllinoisState Hub →
Country Territory
United States
779 Area Code Time Zone
Central
779 Overlay Codes
815

Area Code 779 Geographic Map

Interactive location bounds and coverage area for Illinois (Central Timezone)

Lat: 41.76° • Lng: -88.63°
📍 Geographic Center: IllinoisMap data © OpenStreetMap contributors

Where is Area Code 779 Located?

Telephone area code 779 is assigned to Illinois in United States. It serves cities and metropolitan communities including Joliet, Rockford, Plainfield, Crystal Lake, Romeoville, Dekalb, Mchenry, New Lenox, Lockport, Woodstock.

Historical Context & Area Code Overlay Information:779 serves Illinois (United States).

For local and long-distance calls within area code 779, standard 10-digit dialing (779) XXX-XXXX applies.

Who Called Me from Area Code 779?

Received an unknown call, missed call, or text scam from area code 779? Here is how to trace who is calling from 779 area code and verify unknown numbers safely:

1.
Identify Missed Calls & Voicemails:

Legitimate contacts usually leave a detailed voicemail or caller ID record.

2.
Watch Out for Neighbor Spoofing:

Robocallers often fake incoming caller ID numbers using your local 779 prefix to boost pick-up rates.

3.
Reverse Phone Lookup Area Code 779:

Search public white-pages or use caller intelligence guides before returning unfamiliar calls.

Learn How Reverse Phone Lookups Work→

How to Call Area Code 779 & Dialing Format

When placing a phone call to a number in area code 779, follow the correct dialing format depending on your calling location:

  • Calling from inside the US / Canada (+1): Dial 1 + (779) + 7-digit number.
  • Calling from an international location outside +1: Dial your country's international exit code (e.g. 011 in US or + on mobile) + 1 + 779 + 7-digit number.
  • Do I need to dial area code 779 for local calls? Yes, 10-digit dialing (area code + line number) is mandatory across North American telephone networks.

Top Cities & Municipalities Served in Area Code 779

Urban centers, census places, and communities within the +1-779 calling area

50 Major Cities Listed
City NameCountyPopulation% of 779 Pop
JolietWill County152,24114.1%
RockfordWinnebago County147,38413.7%
PlainfieldKendall County50,0434.7%
Crystal LakeMcHenry County42,2883.9%
RomeovilleWill County41,2813.8%
DekalbDeKalb County40,4673.8%
MchenryMcHenry County29,2172.7%
New LenoxWill County28,8932.7%
LockportWill County27,8222.6%
WoodstockMcHenry County25,7402.4%
BelvidereBoone County25,4622.4%
Loves ParkWinnebago County23,7122.2%
KankakeeKankakee County23,4002.2%
FreeportStephenson County23,2022.2%
Machesney ParkWinnebago County22,8052.1%
FrankfortWill County21,3652.0%
SycamoreDeKalb County19,0831.8%
OttawaLaSalle County18,6841.7%
ShorewoodKendall County18,5361.7%
BourbonnaisKankakee County17,6581.6%

Counties Covered by Area Code 779

Geographic county distribution and population coverage across Illinois

County NameTotal Population% of 779 Area% of County
Will County708,98026.3%40%
Winnebago County282,96520.5%78%
McHenry County315,73011.7%40%
Kendall County143,1257.1%53%
Kankakee County105,8146.1%62%
DeKalb County100,6216.0%65%
Grundy County53,7215.0%100%
LaSalle County107,8754.2%42%
Boone County53,5262.8%57%
Stephenson County43,4222.2%53%
Whiteside County54,4232.1%42%
Lee County32,8512.0%65%
Putnam County5,6171.4%100%
Livingston County35,1841.0%31%
Ogle County51,2740.9%19%
Bureau County32,5190.7%24%

☎️Area Code 779 Exchange Prefixes & Carriers

Showing 50 of 362 central office 3-digit prefixes and assigned telecom carriers

47% Landline29% Wireless24% VoIP
PrefixLine UsageRate CenterAssigned CarrierAssign Date
(779) 200-📱WirelessROCKFORDCELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL01/18/2011
(779) 201-📱WirelessLA SALLECELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL03/15/2012
(779) 202-📞LandlineGALENATELEPORT COMMUNICATIONS AMERICA, LLC - IL03/06/2012
(779) 203-📞LandlineROCKFORDLEVEL 3 COMMUNICATIONS, LLC - IL10/13/2011
(779) 204-💻VoIPVERONAONVOY, LLC03/19/2014
(779) 205-📱WirelessJOLIETNEW CINGULAR WIRELESS PCS, LLC - IL05/30/2012
(779) 206-📱WirelessJOLIETCELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL06/20/2012
(779) 207-📱WirelessROCKFORDCELLCO PARTNERSHIP DBA VERIZON WIRELESS - ILN/A
(779) 208-📱WirelessROCKFORDCELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL11/16/2012
(779) 209-💻VoIPSANDWICHPEERLESS NETWORK OF ILLINOIS, LLC - IL08/31/2012
(779) 210-📞LandlineROCKFORDAT&T ENTERPRISES, LLC09/16/2011
(779) 211-📞LandlineXXXXXXXXXXMULTIPLE OCN LISTINGN/A
(779) 212-📞LandlineDE KALBNUSO, LLC03/13/2013
(779) 213-💻VoIPOGLESBYPEERLESS NETWORK OF ILLINOIS, LLC - IL04/09/2013
(779) 214-📞LandlineGALENAMEDIACOM TELEPHONY OF ILLINOIS, LLC - IL12/17/2009
(779) 215-📞LandlineTONICAIP HORIZON LLC04/09/2013
(779) 216-💻VoIPFRANKFORTPEERLESS NETWORK OF ILLINOIS, LLC - IL04/09/2013
(779) 217-📞LandlineDE KALBBOOST SUBSCRIBERCO L.L.C.05/19/2023
(779) 218-💻VoIPWATSEKAPEERLESS NETWORK OF ILLINOIS, LLC - IL04/09/2013
(779) 219-📞LandlineBRAIDWOODCOMMIO, LLC08/11/2023
(779) 220-💻VoIPCRYSTAL LKBANDWIDTH.COM CLEC, LLC - IL05/25/2011
(779) 221-💻VoIPROCKFORDONVOY, LLC04/02/2010
(779) 222-📞LandlineSYCAMORETELNYX LLCN/A
(779) 223-💻VoIPONARGAONVOY, LLC03/23/2016
(779) 224-📱WirelessMOMENCENEW CINGULAR WIRELESS PCS, LLC - IL06/08/2023
(779) 225-📱WirelessJOLIETCELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL09/21/2011
(779) 226-📞LandlinePOLOCOMCAST IP PHONE, LLC04/24/2013
(779) 227-📱WirelessJOLIETMETROPCS, INC.07/01/2014
(779) 228-💻VoIPMAZONPEERLESS NETWORK OF ILLINOIS, LLC - IL04/10/2013
(779) 229-📞LandlineDEPUECOMCAST IP PHONE, LLC05/07/2013
(779) 230-📱WirelessJOLIETNEW CINGULAR WIRELESS PCS, LLC - IL09/28/2016
(779) 231-📞LandlineJOLIETMCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL12/21/2015
(779) 232-📞LandlineWILMINGTONTELEPORT COMMUNICATIONS AMERICA, LLC - IL06/07/2007
(779) 233-📱WirelessJOLIETT-MOBILE USA, INC.07/21/2011
(779) 234-💻VoIPPLAINFIELDBANDWIDTH.COM CLEC, LLC - ILN/A
(779) 235-📞LandlineCRESCENTCYAT&T ENTERPRISES, LLC02/04/2011
(779) 236-📱WirelessKANKAKEET-MOBILE USA, INC.07/27/2011
(779) 237-📱WirelessSTREATORCELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL01/08/2018
(779) 238-📱WirelessROCKFORDT-MOBILE USA, INC.04/04/2017
(779) 239-📱WirelessPRINCETONNEW CINGULAR WIRELESS PCS, LLC - IL01/14/2016
(779) 240-📱WirelessKANKAKEET-MOBILE USA, INC.06/11/2014
(779) 241-📱WirelessMORRIST-MOBILE USA, INC.06/01/2017
(779) 242-📱WirelessJOLIETNEW CINGULAR WIRELESS PCS, LLC - IL10/05/2017
(779) 243-📱WirelessFRANKFORTNEW CINGULAR WIRELESS PCS, LLC - IL10/05/2017
(779) 244-📱WirelessMCHENRYNEW CINGULAR WIRELESS PCS, LLC - IL10/05/2017
(779) 245-📱WirelessSTERLINGT-MOBILE USA, INC.07/14/2008
(779) 246-📞LandlineROCHELLETELEPORT COMMUNICATIONS AMERICA, LLC - IL10/23/2017
(779) 247-📱WirelessWOODSTOCKCELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL12/01/2017
(779) 248-📞LandlineGALENACENTURYLINK COMMUNICATIONS, LLC06/03/2016
(779) 249-📱WirelessDWIGHTCELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL02/22/2018

Frequently Asked Questions about Area Code 779

Where is area code 779 located?

Area code 779 is located in Illinois (United States), serving cities like Joliet, Rockford, Plainfield, Crystal Lake, Romeoville, Dekalb, Mchenry, New Lenox, Lockport, Woodstock.

What timezone is area code 779?

Area code 779 operates in the Central timezone.

What state is area code 779?

Area code 779 is assigned to the state / telecom territory of Illinois.

Is area code 779 a scam or dangerous?

Area code 779 is an official geographic area code for Illinois. However, beware of robocaller spoofing.

Illinois State Area Codes

View complete directory of telephone area codes assigned to Illinois.

Explore Illinois Directory

Get a 779 Business Phone Number

How to acquire a virtual phone number or business line with area code 779 for local customer trust in Illinois.

Get 779 Business Number
🛡️ Scam & Safety Directory

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Overlay & Nearby Area Codes for Illinois

Explore neighboring telecom prefixes sharing geographical boundaries with area code 779.

815
Central
Area Code 815
Joliet, Rockford, Plainfield, Crystal Lake, Romeoville, Dekalb, Mchenry, New Lenox, Lockport, Woodstock
217
Central
Area Code 217
Springfield, Champaign, Decatur, Urbana, Quincy, Danville, Jacksonville, Charleston, Mattoon, Chatham
224
Central
Area Code 224
Elgin, Waukegan, Schaumburg, Evanston, Arlington Heights, Skokie, Palatine, Des Plaines, Mount Prospect, Hoffman Estates
309
Central
Area Code 309
Peoria, Bloomington, Normal, Moline, Romeoville, Rock Island, Pekin, Galesburg, East Peoria, Crest Hill
312
Central
Area Code 312
Chicago, West Chicago
331
Central
Area Code 331
Aurora, Naperville, Schaumburg, Bolingbrook, Wheaton, Downers Grove, Elmhurst, Lombard, Bartlett, Oswego