779 Area Code in Illinois, United States

Description

Area code 779 is an overlay for area code 815, serving northern Illinois outside the Chicago metropolitan area. It was introduced in 2007 due to increasing demand for phone numbers in the region. The 779/815 area includes cities such as Rockford, Joliet, DeKalb, and Kankakee. It spans a mix of urban centers, suburban communities, and rural farmland, reflecting the diversity of northern Illinois. Ten-digit dialing is required throughout the area. While 815 holds historical significance, 779 is commonly used for newer mobile lines and businesses. The dual-code system ensures continuity while supporting regional growth and development.

Time & Time Zone

Time zone:

Central (GMT -06:00)

Current time:

Map

Major Cities

City	Prefixes
Rockford	(779) 200 , (779) 203 , (779) 207 , (779) 208 , (779) 210 , (779) 221 , (779) 300 , (779) 348 , (779) 368 , (779) 423 , (779) 500 , (779) 537 , (779) 696 , (779) 770 , (779) 771 , (779) 772 , (779) 774
Joliet	(779) 205 , (779) 206 , (779) 225 , (779) 233 , (779) 279 , (779) 379 , (779) 435 , (779) 456 , (779) 875
Dekalb	(779) 212 , (779) 222 , (779) 400 , (779) 777
Crystal Lake	(779) 220 , (779) 800 , (779) 994
Frankfort	(779) 216 , (779) 324 , (779) 333
La Salle	(779) 201 , (779) 223
Winnebago	(779) 256 , (779) 863
Wilmington	(779) 232 , (779) 429
Galena	(779) 202 , (779) 214
Wonder Lake	(779) 444
Mount Morris	(779) 545
Bureau	(779) 229

Counties

County	Prefixes
Winnebago	(779) 200 , (779) 203 , (779) 207 , (779) 208 , (779) 210 , (779) 221 , (779) 256 , (779) 300 , (779) 348 , (779) 368 , (779) 423 , (779) 475 , (779) 500 , (779) 537 , (779) 696 , (779) 770 , (779) 771 , (779) 772 , (779) 774 , (779) 863
Will	(779) 205 , (779) 206 , (779) 216 , (779) 225 , (779) 232 , (779) 233 , (779) 279 , (779) 324 , (779) 333 , (779) 379 , (779) 429 , (779) 435 , (779) 456 , (779) 875
Dekalb	(779) 209 , (779) 212 , (779) 222 , (779) 382 , (779) 400 , (779) 777
Mchenry	(779) 220 , (779) 444 , (779) 548 , (779) 800 , (779) 994
La Salle	(779) 201 , (779) 213 , (779) 215 , (779) 223
Ogle	(779) 226 , (779) 545
Iroquois	(779) 218 , (779) 235
Bureau	(779) 229 , (779) 432
Jo Daviess	(779) 202 , (779) 214
Kankakee	(779) 236 , (779) 529
Grundy	(779) 228
Whiteside	(779) 245
Kendall	(779) 999
Lee	(779) 861
Boone	(779) 552

Telephone Carriers

Carrier	Type	Prefixes (%)
Cellco Partnership Dba Verizon Wireless Il	Wireless	13%
Denali Spectrum License Llc	Wireless	9%
Peerless Network Of Illinois Llc Il	Landline	9%
Bandwidth Com Clec Llc Il	Landline	8%
Comcast Phone Of Illinois Llc Dba Comco Il	Landline	8%
Sprint Spectrum L P	Wireless	8%
Teleport Communications America Llc Il	Landline	6%
Cygnus Telecommunications Corporation Il	Landline	5%
Neutral Tandem Illinois Llc Il	Landline	3%
Sbc Internet Services Inc	Landline	3%
Charter Fiberlink Illinois Llc Il	Landline	3%
Broadvox Clec Llc Il	Landline	2%
Tds Metrocom Inc Il	Landline	2%
Ymax Communications Corp Il	Landline	2%
365 Wireless Llc	Wireless	2%
Mediacom Telephony Of Illinois Llc Il	Landline	2%
New Cingular Wireless Pcs Llc Il	Wireless	2%
Local Access Llc	Landline	2%
Mtco Communications Inc	Landline	2%
T Mobile Usa Inc	Wireless	2%
Mcleodusa Telecommunications Services Inc Il	Landline	2%
Iowa Wireless Services Lp	Wireless	2%
Digital Network Access Communications Inc Il	Landline	2%
Ameritech Illinois	Landline	2%

Prefixes

Prefix	City	Carrier	Type
(779) 529	Manteno	Bandwidth.com Clec, Llc - Il	Landline
(779) 206	Joliet	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 220	Crystal Lake	Bandwidth.com Clec, Llc - Il	Landline
(779) 205	Joliet	New Cingular Wireless Pcs, Llc - Il	Wireless
(779) 201	La Salle	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 256	Winnebago
(779) 423	Rockford	Comcast Phone of Illinois, Llc Dba Comco - Il	Landline
(779) 444	Wonder Lake	Bandwidth.com Clec, Llc - Il	Landline
(779) 216	Frankfort	Peerless Network of Illinois, Llc - Il	Landline
(779) 368	Rockford	Comcast Phone of Illinois, Llc Dba Comco - Il	Landline
(779) 774	Rockford	Tds Metrocom Inc.-il	Landline
(779) 215	Tonica	Local Access Llc	Landline
(779) 432	Sheffield	Mtco Communications, Inc.	Landline
(779) 800	Crystal Lake	Neutral Tandem-illinois, Llc - Il	Landline
(779) 210	Rockford	Sbc Internet Services, Inc.	Landline
(779) 861	Dixon	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 245	Sterling	Iowa Wireless Services, Lp	Wireless
(779) 772	Rockford	Denali Spectrum License, Llc	Wireless
(779) 324	Frankfort	Bandwidth.com Clec, Llc - Il	Landline
(779) 435	Joliet	Ameritech Illinois	Landline
(779) 333	Frankfort	Neutral Tandem-illinois, Llc - Il	Landline
(779) 225	Joliet	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 770	Rockford	Denali Spectrum License, Llc	Wireless
(779) 279	Joliet	Denali Spectrum License, Llc	Wireless
(779) 771	Rockford	Denali Spectrum License, Llc	Wireless
(779) 229	Bureau	Comcast Phone of Illinois, Llc Dba Comco - Il
(779) 235	Crescent City	Sbc Internet Services, Inc.	Wireless
(779) 545	Mount Morris	Comcast Phone of Illinois, Llc Dba Comco - Il	Landline
(779) 379	Joliet	Denali Spectrum License, Llc	Wireless
(779) 226	Polo	Comcast Phone of Illinois, Llc Dba Comco - Il	Landline
(779) 777	Dekalb	Denali Spectrum License, Llc	Wireless
(779) 429	Wilmington	Cygnus Telecommunications Corporation - Il	Landline
(779) 999	Newark	Cygnus Telecommunications Corporation - Il	Landline
(779) 236	Kankakee	Sprint Spectrum L.p.	Wireless
(779) 221	Rockford	Broadvox-clec, Llc - Il	Landline
(779) 382	Genoa	Charter Fiberlink - Illinois, Llc - Il	Landline
(779) 696	Rockford	Mcleodusa Telecommunications Services, Inc.- Il	Landline
(779) 213	Oglesby	Peerless Network of Illinois, Llc - Il	Landline
(779) 552	Belvidere	Digital Network Access Communications, Inc. - Il	Landline
(779) 500	Rockford	Teleport Communications America, Llc - Il	Landline
(779) 202	Galena	Teleport Communications America, Llc - Il	Landline
(779) 400	Dekalb	Ymax Communications Corp. - Il	Landline
(779) 203	Rockford	Sprint Spectrum L.p.	Wireless
(779) 200	Rockford	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 218	Iroquois	Peerless Network of Illinois, Llc - Il
(779) 209	Sandwich	Peerless Network of Illinois, Llc - Il	Landline
(779) 228	Mazon	Peerless Network of Illinois, Llc - Il	Landline
(779) 475	South Beloit	Charter Fiberlink - Illinois, Llc - Il	Landline
(779) 207	Rockford	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 348	Rockford	Teleport Communications America, Llc - Il	Landline
(779) 456	Joliet	T-mobile Usa, Inc.	Wireless
(779) 232	Wilmington	Teleport Communications America, Llc - Il	Landline
(779) 223	La Salle
(779) 863	Winnebago
(779) 214	Galena	Mediacom Telephony of Illinois, Llc - Il	Landline
(779) 875	Joliet	Sprint Spectrum L.p.	Wireless
(779) 548	Marengo	Bandwidth.com Clec, Llc - Il	Landline
(779) 208	Rockford	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 537	Rockford	Cellco Partnership Dba Verizon Wireless - Il	Wireless
(779) 212	Dekalb	365 Wireless, Llc	Wireless
(779) 300	Rockford	Sprint Spectrum L.p.	Wireless
(779) 222	Dekalb	Cygnus Telecommunications Corporation - Il	Landline
(779) 233	Joliet	Sprint Spectrum L.p.	Wireless
(779) 994	Crystal Lake	Peerless Network of Illinois, Llc - Il	Landline