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Area Code 779

Area code 779 is in Illinois, USA , spanning 24 counties and serving 248 cities, including Joliet, Dekalb or Crystal Lake; it currently uses 295 prefixes, assigned from 779-200-XXXX through 779-999-XXXX.

In service since March 17, 2007, area code 779 is an overlay Numbering Plan Area, part of overlay complex 815/779.

The current local time is .

779 area code location on a map

© OpenStreetMap contributors
For exact boundaries see official 779 area code map

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Locate any 779-NXX prefix:

NPANXX Area served1 Date2
779-200 Rockford 1/18/2011
779-201 La Salle 3/15/2012
779-202 Galena 3/6/2012
779-203 Rockford 10/13/2011
779-204 Verona 3/19/2014
779-205 Joliet 5/30/2012
779-206 Joliet 6/20/2012
779-207 Rockford N/A
779-208 Rockford 11/16/2012
779-209 Sandwich 8/31/2012
779-210 Rockford 9/16/2011
779-212 De Kalb 3/13/2013
779-213 Oglesby 4/9/2013
779-214 Galena 12/17/2009
779-215 Tonica 4/9/2013
779-216 Frankfort 4/9/2013
779-217 De Kalb 05/19/2023
779-218 Watseka 4/9/2013
779-219 Braidwood 08/11/2023
779-220 Crystal Lake 5/25/2011
779-221 Rockford 4/2/2010
779-222 Sycamore 8/5/2010
779-223 Onarga 3/23/2016
779-224 Momence 06/08/2023
779-225 Joliet 9/21/2011
779-226 Polo 4/24/2013
779-227 Joliet 7/1/2014
779-228 Mazon 4/10/2013
779-229 Depue 5/7/2013
779-230 Joliet 9/28/2016
779-231 Joliet 12/21/2015
779-232 Wilmington 6/7/2007
779-233 Joliet 7/21/2011
779-234 Plainfield 8/1/2013
779-235 Crescent City 2/4/2011
779-236 Kankakee 7/27/2011
779-237 Streator 1/8/2018
779-238 Rockford 4/4/2017
779-239 Princeton 1/14/2016
779-240 Kankakee 6/11/2014
779-241 Morris 6/1/2017
779-242 Joliet 10/5/2017
779-243 Frankfort 10/5/2017
779-244 Mchenry 10/5/2017
779-245 Sterling 7/14/2008
779-246 Rochelle 10/23/2017
779-247 Woodstock 12/1/2017
779-248 Galena 6/3/2016
779-249 Dwight 2/22/2018
779-250 Sterling 2/27/2018
779-251 Dixon 4/1/2014
779-252 Plainfield 1/6/2016
779-253 South Beloit 10/7/2014
779-254 Frankfort 9/1/2015
779-255 De Kalb 5/16/2018
779-256 Rockford 6/5/2018
779-257 Wilmington 7/11/2018
779-258 Herscher 8/27/2018
779-259 Manteno 8/27/2018
779-260 Joliet 10/8/2018
779-261 Fairbury 11/30/2018
779-262 Oglesby 12/5/2018
779-263 Plainfield 1/2/2018
779-264 Kankakee 10/7/2019
779-265 Mchenry 10/8/2019
779-266 Lanark 12/9/2019
779-267 Joliet 1/17/2020
779-268 St Anne 2/6/2020
779-269 Rockford 2/10/2020
779-270 De Kalb 2/19/2020
779-271 Lanark 4/29/2020
779-272 Rockford 5/1/2020
779-273 Danforth 5/28/2020
779-274 Rockford 6/26/2020
779-275 Rockford 7/28/2020
779-276 De Kalb 7/28/2020
779-277 Flanagan 8/12/2020
779-278 Grand Ridge 3/18/2021
779-279 Joliet 10/29/2008
779-280 Donovan 8/25/2020
779-281 Toluca 8/12/2020
779-282 Martinton 8/25/2020
779-283 Richmond 8/25/2020
779-284 Sheldon 8/25/2020
779-285 Sheridan 8/25/2020
779-286 Spring Grove 8/25/2020
779-287 Union 3/24/2016
779-288 Beaverville 6/2/2021
779-289 South Beloit 9/1/2020
779-290 Milford 9/2/2020
779-291 Wonder Lake 9/4/2020
779-292 Onarga 9/4/2020
779-293 New Lenox 9/4/2020
779-294 Harding 9/4/2020
779-295 Mazon 9/4/2020
779-296 Long Point 9/8/2020
779-297 Sterling 9/15/2020
779-298 Forrest 9/15/2020
779-299 Wenona 9/17/2020

NPANXX Area served1 Date2
779-300 Rockford 2/17/2011
779-301 Kankakee 6/11/2014
779-302 Woodstock 2/27/2015
779-303 Plainfield N/A
779-304 Rutland 9/17/2020
779-305 Reddick 9/17/2020
779-306 Pontiac 9/17/2020
779-307 Lostant 9/17/2020
779-308 Chatsworth 9/17/2020
779-309 South Sharon 06/13/2023
779-310 New Milford 9/17/2020
779-312 Woodstock 06/21/2023
779-313 Cherry Valley 9/17/2020
779-314 Rock Cut 9/17/2020
779-315 Roscoe 9/17/2020
779-316 Creston 9/17/2020
779-317 Kirkland 9/17/2020
779-318 Malta 9/17/2020
779-319 Maple Park 9/17/2020
779-320 Monroe Center 9/17/2020
779-321 Shabbona 9/17/2020
779-322 Thomas 9/17/2020
779-323 Rockford 9/30/2020
779-324 Frankfort 8/17/2010
779-325 Franklin Grove 11/25/2020
779-326 Dwight 12/10/2020
779-327 Warren 6/10/2021
779-328 Hanover 6/10/2021
779-329 Mendota 6/10/2021
779-330 Belvidere 6/22/2021
779-331 Kankakee 07/18/2023
779-332 Durand 6/10/2021
779-333 Frankfort 4/11/2013
779-334 De Kalb 11/4/2020
779-335 Rockford 6/23/2021
779-336 Woodstock 2/10/2021
779-337 Woodland 6/24/2021
779-338 Crescent City 6/24/2021
779-339 Frankfort 10/19/2021
779-340 Coal City 11/22/2021
779-341 Joliet 12/29/2021
779-342 Dwight 7/14/2021
779-343 German Valley 11/4/2021
779-344 Seward 11/4/2021
779-345 Byron 7/27/2020
779-346 Capron 9/18/2020
779-347 Winslow 11/4/2021
779-348 Rockford 6/13/2007
779-349 Spring Valley 1/11/2022
779-350 Momence 10/3/2022
779-351 Rockford 2/25/2022
779-352 Waterman 1/28/2022
779-353 Forreston 3/31/2022
779-354 Davis 3/31/2022
779-355 Harmon 3/31/2022
779-356 Crystal Lake 7/14/2020
779-357 Leaf River 4/12/2022
779-358 Plainfield 10/18/2022
779-359 Belvidere 11/15/2022
779-360 Momence 12/29/2022
779-361 Kankakee 01/03/2023
779-362 Fairbury 01/19/2023
779-363 Rockford 02/08/2023
779-364 Streator 02/08/2023
779-365 De Kalb 02/15/2023
779-366 Rockford 03/08/2023
779-367 Sycamore 03/10/2023
779-368 New Milford 8/21/2007
779-369 Momence 03/16/2023
779-370 Rockford 04/18/2023
779-371 Momence 07/18/2023
779-372 Dixon 07/20/2023
779-373 Rockford 07/20/2023
779-374 Joliet 07/26/2023
779-375 Joliet 07/26/2023
779-376 Grant Park 08/11/2023
779-377 South Beloit 9/13/2021
779-378 Mchenry 08/18/2023
779-379 Joliet 10/29/2008
779-380 Momence 09/06/2023
779-381 La Salle 10/19/2023
779-382 Genoa 5/7/2007
779-383 Momence 10/30/2023
779-384 Harvard 01/09/2024
779-385 Momence 02/06/2024
779-386 Princeton 02/08/2024
779-389 Garden Prairie 4/19/2021
779-397 Cabery 05/03/2023
779-399 Kinsman 1/8/2021

NPANXX Area served1 Date2
779-400 De Kalb 2/17/2011
779-410 Stockton 3/30/2021
779-423 Rockford 8/8/2007
779-426 Manhattan 1/13/2022
779-429 Wilmington 11/13/2008
779-432 Sheffield 3/27/2007
779-435 Joliet 11/13/2006
779-444 Wonder Lake 8/17/2010
779-445 Lockport 11/8/2022
779-456 Joliet 1/9/2008
779-463 Morris 3/23/2022
779-465 Braidwood 10/10/2019
779-466 Emington 1/26/2022
779-475 South Beloit 3/27/2007
779-479 Graymont 4/18/2021
779-499 Freeport 9/13/2021

NPANXX Area served1 Date2
779-500 Rockford 3/16/2011
779-513 Rockford 10/16/2015
779-529 Manteno 8/17/2010
779-537 Rockford 3/27/2007
779-545 Mount Morris 8/8/2007
779-548 Marengo 8/16/2010
779-552 Belvidere 6/4/2007
779-577 Rockford 9/13/2021
779-579 Kempton 4/18/2021
779-599 Paw Paw 7/14/2020

NPANXX Area served1 Date2
779-600 Cissna Park 8/8/2019
779-601 La Salle 9/10/2014
779-624 Momence 1/13/2022
779-625 Woodstock 2/23/2022
779-639 Mchenry 1/13/2022
779-666 Rockford 10/3/2017
779-675 Ohio 1/13/2022
779-677 Freeport 7/27/2020
779-678 Rockford 1/12/2021
779-679 Magnolia 4/18/2021
779-696 Rockford 8/18/2010
779-699 South Beloit 7/17/2020

NPANXX Area served1 Date2
779-701 Kankakee 1/28/2015
779-702 Joliet 6/11/2014
779-703 Joliet 10/7/2013
779-704 Mchenry 10/31/2013
779-706 Sandwich 2/24/2015
779-707 Joliet 4/21/2015
779-710 Rockford 3/18/2021
779-713 Woodstock 5/22/2015
779-717 Spring Valley 10/15/2015
779-722 Ashton 9/18/2020
779-729 Lena 4/13/2021
779-732 La Salle 2/10/2021
779-739 Forrest 2/14/2022
779-746 Cissna Park 1/13/2022
779-749 Steward 4/13/2021
779-758 Joliet 10/11/2019
779-759 Sycamore 4/13/2021
779-766 Depue 7/14/2020
779-770 Rockford 11/18/2008
779-771 Rockford 11/18/2008
779-772 Rockford 11/18/2008
779-774 Rockford 2/1/2012
779-775 De Kalb 9/13/2021
779-777 De Kalb 10/22/2008
779-778 Winnebago 5/28/2020
779-783 Stockland 1/13/2022
779-788 Pecatonica 1/28/2021
779-789 Rockton 4/19/2021
779-790 Sterling 04/12/2023
779-797 Rockford 9/23/2021
779-799 Coleta 7/27/2020

NPANXX Area served1 Date2
779-800 Crystal Lake 4/11/2013
779-801 Kankakee 9/7/2016
779-803 New Lenox 8/16/2013
779-804 Pontiac 2/24/2015
779-809 Fulton 3/28/2022
779-832 Cedar Point 1/13/2022
779-837 Elwood 1/7/2022
779-855 Forrest 3/31/2021
779-861 Dixon 5/26/2010
779-867 Rockford 4/12/2021
779-875 Joliet 7/12/2007
779-877 Verona 7/14/2020
779-879 Streator 4/18/2021
779-888 Rockford 1/28/2015
779-895 Rockford 2/1/2022
779-899 Lisbon 7/14/2020

NPANXX Area served1 Date2
779-900 Frankfort 9/17/2019
779-901 Marengo 4/30/2015
779-902 De Kalb 3/19/2021
779-903 Braidwood 7/29/2013
779-904 Freeport 3/24/2021
779-910 De Kalb 3/18/2021
779-915 Woodstock 11/16/2016
779-922 Hooppole 7/27/2020
779-927 Marengo 1/13/2022
779-931 Sandwich 10/27/2016
779-933 Hinckley 7/27/2020
779-939 Joliet 2/3/2016
779-946 Granville 7/14/2020
779-970 Rockford 9/14/2015
779-977 Harvard 7/14/2020
779-978 Sandwich 6/4/2015
779-979 Piper City 4/19/2021
779-990 Forrest 4/12/2021
779-991 Leland 8/12/2020
779-994 Crystal Lake 4/10/2013
779-997 Plattville 1/13/2022
779-999 Newark 9/24/2010
  1. For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
  2. Assignment date. N/A - mostly central office codes assigned before 2001.
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Cities in area code 779

City1 County Time2
Alden McHenry C
Amboy Lee C
Ancona Livingston C
Apple River Jo Daviess C
Arlington Bureau C
Aroma Park Kankakee C
Ashkum Iroquois C
Ashton Lee C
Baileyville Ogle C
Beaverville Iroquois C
Belvidere Boone C
Blackstone Livingston C
Bonfield Kankakee C
Bourbonnais Kankakee C
Braceville Grundy C
Bradley Kankakee C
Braidwood Will C
Buckingham Kankakee C
Bureau Bureau C
Byron Ogle C
Cabery Ford C
Caledonia Boone C
Campus Livingston C
Capron Boone C
Cedar Point La Salle C
Cedarville Stephenson C
Chadwick Carroll C
Chana Ogle C
Channahon Will C
Chatsworth Livingston C
Chebanse Iroquois C
Chenoa McLean C
Cherry Bureau C
Cherry Valley Winnebago C
Cissna Park Iroquois C
Clare Dekalb C
Claytonville Iroquois C
Clifton Iroquois C
Coal City Grundy C
Compton Lee C
Cornell Livingston C
Cortland Dekalb C
Crescent City Iroquois C
Creston Ogle C
Crystal Lake McHenry C
Cullom Livingston C
Dakota Stephenson C
Dalzell Bureau C
Dana La Salle C
Danforth Iroquois C
Davis Stephenson C
Davis Junction Ogle C
Deer Grove Whiteside C
Dekalb Dekalb C
Depue Bureau C
Dixon Lee C
Donovan Iroquois C
Dover Bureau C
Durand Winnebago C
Dwight Livingston C
Earlville La Salle C
East Dubuque Jo Daviess C
Eldena Lee C
Eleroy Stephenson C
Elizabeth Jo Daviess C
Elwood Will C
Emington Livingston C
Esmond Dekalb C
Essex Kankakee C
Fairbury Livingston C
Flanagan Livingston C
Forrest Livingston C
Forreston Ogle C
Frankfort Will C
Franklin Grove Lee C
Freeport Stephenson C
Fulton Whiteside C
Galena Jo Daviess C
Galt Whiteside C
Garden Prairie Boone C
Gardner Grundy C
Genoa Dekalb C
German Valley Stephenson C
Gilman Iroquois C
Goodwine Iroquois C
Grand Ridge La Salle C
Grant Park Kankakee C
Granville Putnam C
Graymont Livingston C
Hanover Jo Daviess C
Harmon Lee C
Harvard McHenry C
Hebron McHenry C
Hennepin Putnam C
Herscher Kankakee C
Hinckley Dekalb C
Holcomb Ogle C
Homer Glen Will C
Hooppole Henry C
Hopkins Park Kankakee C
Iroquois Iroquois C
Joliet Will C
Kankakee Kankakee C
Kasbeer Bureau C
Kempton Ford C
Kent Stephenson C
Kingston Dekalb C
Kinsman Grundy C
Kirkland Dekalb C
La Moille Bureau C
La Salle La Salle C
Ladd Bureau C
Lanark Carroll C
Leaf River Ogle C
Lee Lee C
Lee Center Lee C
Leland La Salle C
Lena Stephenson C
Leonore La Salle C
Lindenwood Ogle C
Lockport Will C
Long Point Livingston C
Lostant La Salle C
Loves Park Winnebago C
Lyndon Whiteside C
Machesney Park Winnebago C
Magnolia Putnam C
Malden Bureau C
Malta Dekalb C
Manhattan Will C
Manlius Bureau C
Manteno Kankakee C
Maple Park Kane C
Marengo McHenry C
Mark Putnam C
Marseilles La Salle C
Martinton Iroquois C
Mazon Grundy C
Mc Connell Stephenson C
Mc Nabb Putnam C
McHenry McHenry C
Mendota La Salle C
Milford Iroquois C
Milledgeville Carroll C
Millington Kendall C
Minooka Grundy C
Momence Kankakee C
Monroe Center Ogle C
Morris Grundy C
Morrison Whiteside C
Mount Carroll Carroll C
Mount Morris Ogle C
Nachusa Lee C
New Bedford Bureau C
New Lenox Will C
Newark Kendall C
Nora Jo Daviess C
Odell Livingston C
Oglesby La Salle C
Ohio Bureau C
Onarga Iroquois C
Orangeville Stephenson C
Oregon Ogle C
Ottawa La Salle C
Papineau Iroquois C
Paw Paw Lee C
Pearl City Stephenson C
Pecatonica Winnebago C
Peru La Salle C
Piper City Ford C
Plainfield Will C
Polo Ogle C
Pontiac Livingston C
Poplar Grove Boone C
Princeton Bureau C
Prophetstown Whiteside C
Putnam Putnam C
Ransom La Salle C
Reddick Kankakee C
Richmond McHenry C
Ridott Stephenson C
Ringwood McHenry C
Rochelle Ogle C
Rock City Stephenson C
Rock Falls Whiteside C
Rockford Winnebago C
Rockton Winnebago C
Romeoville Will C
Roscoe Winnebago C
Rutland La Salle C
Sandwich Dekalb C
Saunemin Livingston C
Savanna Carroll C
Scales Mound Jo Daviess C
Seatonville Bureau C
Seneca La Salle C
Serena La Salle C
Seward Winnebago C
Shabbona Dekalb C
Shannon Carroll C
Sheffield Bureau C
Sheldon Iroquois C
Sheridan La Salle C
Shirland Winnebago C
Somonauk Dekalb C
South Beloit Winnebago C
South Wilmington Grundy C
Spring Grove McHenry C
Spring Valley Bureau C
St Anne Kankakee C
Standard Putnam C
Sterling Whiteside C
Steward Lee C
Stillman Valley Ogle C
Stockland Iroquois C
Stockton Jo Daviess C
Strawn Livingston C
Streator La Salle C
Sublette Lee C
Sycamore Dekalb C
Tampico Whiteside C
Thomson Carroll C
Tiskilwa Bureau C
Toluca Marshall C
Tonica La Salle C
Triumph La Salle C
Troy Grove La Salle C
Union McHenry C
Union Hill Kankakee C
Utica La Salle C
Van Orin Bureau C
Verona Grundy C
Walnut Bureau C
Warren Jo Daviess C
Waterman Dekalb C
Watseka Iroquois C
Wedron La Salle C
Wellington Iroquois C
Wenona Marshall C
West Brooklyn Lee C
Wilmington Will C
Winnebago Winnebago C
Winslow Stephenson C
Wonder Lake McHenry C
Woodland Iroquois C
Woodstock McHenry C
Woosung Ogle C
Wyanet Bureau C
  1. Listed above are most places served by USA area code 779. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. C stands for Central Time Zone (currently ).
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