779 Area Code: Cities, Time Zone and Zip Codes
What area code is 779? The area code 779 is located in Illinois and it serves Rockford, Joliet, DeKalb, Crystal Lake, Romeoville, Plainfield, Kankakee, McHenry, Freeport, Belvidere, and some other surrounding cities. The area code 779 was created on February 6, 2004, and was first put to use on March 17, 2007. It serves as an overlay to area code 815
The top counties that are being served by the 779 area code include Boone County, Bureau County, Carroll County, DeKalb County, Ford County, Grundy County, Henry County, Iroquois County, Jo Daviess County, Kane County, Kankakee County, Kendall County, La Salle County, Lee County, Livingston County, Marshall County, McHenry County, McLean County, Ogle County, Putnam County, Stephenson County, Whiteside County, Will County, and Winnebago County.
The major cities under each of these counties that are being served by the 779 area code are listed below:
Boone County
The cities within Boone County that are served by the 779 area code include Belvidere, Caledonia, Capron, Garden Prairie, and Poplar Grove.
Bureau County
The cities within Bureau County that are served by the 779 area code include Arlington, Bureau, Cherry, Dalzell, Depue, Dover, Kasbeer, La Moille, Ladd, Malden, Manlius, New Bedford, Ohio, Princeton, Seatonville, Sheffield, Spring Valley, Tampico, Tiskilwa, Van Orin, Walnut, and Wyanet.
Carroll County
The cities within Carroll County that are served by the 779 area code include Chadwick, Lanark, Milledgeville, Mount Carroll, Savanna, Shannon, and Thomson.
DeKalb County
The cities within DeKalb County that are served by the 779 area code include Clare, Cortland, Dekalb, Genoa, Hinckley, Kingston, Kirkland, Malta, Sandwich, Shabbona, Somonauk, Sycamore, and Waterman.
Ford County
The cities within Ford County that are served by the 779 area code include Cabery, Kempton, and Piper City.
Grundy County
The cities within Grundy County that are served by the 779 area code include Braceville, Coal City, Gardner, Kinsman, Mazon, Morris, South Wilmington, and Verona.
Henry County
The cities within Henry County that are served by the 779 area code include Hooppole.
Iroquois County
The cities within Iroquois County that are served by the 779 area code include Ashkum, Beaverville, Chebanse, Cissna Park, Claytonville, Clifton, Crescent City, Danforth, Donovan, Gilman, Goodwine, Iroquois, Martinton, Milford, Onarga, Papineau, Sheldon, Stockland, Watseka, Wellington, and Woodland.
Jo Daviess County
The cities within Jo Daviess County that are served by the 779 area code include Apple River, East Dubuque, Elizabeth, Galena, Hanover, Nora, Scales Mound, Stockton, and Warren.
Kane County
The cities within Kane County that are served by the 779 area code include Maple Park.
Kankakee County
The cities within Kankakee County that are served by the 779 area code include Aroma Park, Bonfield, Bourbonnais, Bradley, Buckingham, Essex, Grant Park, Herscher, Hopkins Park, Kankakee, Manteno, Momence, Pembroke Township, Reddick, Saint Anne, and Union Hill.
Kendall County
The cities within Kendall County that are served by the 779 area code include Minooka and Newark.
La Salle County
The cities within La Salle County that are served by the 779 area code include Cedar Point, Dana, Earlville, Grand Ridge, La Salle, Leland, Leonore, Lostant, Marseilles, Mendota, Millington, Oglesby, Ottawa, Peru, Ransom, Serena, Sheridan, Streator, Tonica, Triumph, Troy Grove, Utica, and Wedron.
Lee County
The cities within Lee County that are served by the 779 area code include Amboy, Ashton, Compton, Dixon, Eldena, Franklin Grove, Harmon, , Lee, Lee Center, Nachusa, Paw Paw, Steward, Sublette, and West Brooklyn.
Livingston County
The cities within Livingston County that are served by the 779 area code include Ancona, Blackstone, Campus, Chatsworth, Cornell, Cullom, Dwight, Emington, Fairbury, Flanagan, Forrest, Graymont, Long Point, Odell, Pontiac, Saunemin, and Strawn.
Marshall County
The cities within Marshall County that are served by the 779 area code include Rutland, Toluca, and Wenona.
McHenry County
The cities within McHenry County that are served by the 779 area code include Alden, Crystal Lake, Harvard, Hebron, Marengo, Mchenry, Richmond, Ringwood, Spring Grove, Union, Wonder Lake, and Woodstock.
McLean County
The cities within McLean County that are served by the 779 area code include Chenoa.
Ogle County
The cities within Ogle County that are served by the 779 area code include Baileyville, Byron, Chana, Creston, Davis Junction, Esmond, Forreston, Holcomb, Leaf River, Lindenwood, Monroe Center, Mount Morris, Oregon, Polo, Rochelle, Stillman Valley, and Woosung.
Putnam County
The cities within Putnam County that are served by the 779 area code include Granville, Hennepin, Magnolia, Mark, McNabb, Putnam, and Standard.
Stephenson County
The cities within Stephenson County that are served by the 779 area code include Cedarville, Dakota, Davis, Eleroy, Freeport, German Valley, Kent, Lena, McConnell, Orangeville, Pearl City, Ridott, Rock City, and Winslow.
Whiteside County
The cities within Whiteside County that are served by the 779 area code include Deer Grove, Fenton, Fulton, Galt, Lyndon, Morrison, Prophetstown, Rock Falls, and Sterling.
Will County
The cities within Will County that are served by the 779 area code include Braidwood, Channahon, Crest Hill, Elwood, Frankfort, Joliet, Lockport, Manhattan, New Lenox, Plainfield, Romeoville, Shorewood, and Wilmington.
Winnebago County
The cities within Winnebago County that are served by the 779 area code include Cherry Valley, Durand, Loves Park, Machesney Park, Pecatonica, Rockford, Rockton, Roscoe, Seward, Shirland, South Beloit, and Winnebago.
779 Area Code Time Zone
What time zone is 779 Area Code? The time zone in the 779 area code is the Central Time Zone which is abbreviated as CST. The Central Time Zone is also known as America/Chicago. The Central Standard Time is UTC/GMT -6:00.
Significance of 779 Area Code
I don’t know if you notice that there is a three-digit number that precedes a telephone number any time you receive a call from your cell phone. Any time you see the three-digit code 779, it suggests that the call comes from any of the cities or counties listed above. However, there may be an exemption to this. With the use of mobile phone or roaming phone feature, the caller may not necessarily be at any of these cities or counties at the time of calling.
Nevertheless, knowing the counties and cities that the 779 area code covers can guide you when to call a particular person. This is because the person you want to call may be in a time zone that is different from your own.
Telephone Carriers in 779 Area Code
If you want to get a wireless telephone within the 779 area code, the popular wireless telephone carriers that are currently serving area code 708 which you can approach include Verizon Wireless, Sprint, Cingular Wireless, T-mobile USA, Cricket Comm, 365 Wireless, Sbc Internet Services, and Iowa Wireless Services,
For landline, popular telephone carriers are Sbc Internet Services, Bandwidthcom Clec, Comco Comms, Teleport Comms America, Peerless Network, Local Access, Broadvox-clec, Mediacom Telephony, Level 3 Comms, Centurylink Comms, Neutral Tandem, Ymax Comms Corp., Charter Fiberlink, Mtco Comms, Digital Network Access Comms, Mcleodusa telecom Services, Mci Worldcom Comms, and Tds Metrocom.
Zip Codes in 779 Area Code
| City | County | State | Area Code | Zip Code |
| Alden | Mchenry | Illinois | 779 | 60001 |
| Amboy | Lee | Illinois | 779 | 61310 |
| Ancona | Livingston | Illinois | 779 | 61311 |
| Apple River | Jo Daviess | Illinois | 779 | 61001 |
| Arlington | Bureau | Illinois | 779 | 61312 |
| Aroma Park | Kankakee | Illinois | 779 | 60910 |
| Ashkum | Iroquois | Illinois | 779 | 60911 |
| Ashton | Lee | Illinois | 779 | 61006 |
| Baileyville | Ogle | Illinois | 779 | 61007 |
| Beaverville | Iroquois | Illinois | 779 | 60912 |
| Belvidere | Boone | Illinois | 779 | 61008 |
| Blackstone | Livingston | Illinois | 779 | 61313 |
| Bonfield | Kankakee | Illinois | 779 | 60913 |
| Bourbonnais | Kankakee | Illinois | 779 | 60914 |
| Braceville | Grundy | Illinois | 779 | 60407 |
| Bradley | Kankakee | Illinois | 779 | 60915 |
| Braidwood | Will | Illinois | 779 | 60408 |
| Buckingham | Kankakee | Illinois | 779 | 60917 |
| Bureau | Bureau | Illinois | 779 | 61315 |
| Byron | Ogle | Illinois | 779 | 61010 |
| Cabery | Ford | Illinois | 779 | 60919 |
| Caledonia | Boone | Illinois | 779 | 61011 |
| Campus | Livingston | Illinois | 779 | 60920 |
| Capron | Boone | Illinois | 779 | 61012 |
| Cedar Point | LaSalle | Illinois | 779 | 61316 |
| Cedarville | Stephenson | Illinois | 779 | 61013 |
| Chadwick | Carroll | Illinois | 779 | 61014 |
| Chana | Ogle | Illinois | 779 | 61015 |
| Channahon | Will | Illinois | 779 | 60410 |
| Chatsworth | Livingston | Illinois | 779 | 60921 |
| Chebanse | Iroquois | Illinois | 779 | 60922 |
| Chenoa | McLean | Illinois | 779 | 61726 |
| Cherry | Bureau | Illinois | 779 | 61317 |
| Cherry Valley | Winnebago | Illinois | 779 | 61016 |
| Cissna Park | Iroquois | Illinois | 779 | 60924 |
| Clare | DeKalb | Illinois | 779 | 60111 |
| Claytonville | Iroquois | Illinois | 779 | 60926 |
| Clifton | Iroquois | Illinois | 779 | 60927 |
| Coal City | Grundy | Illinois | 779 | 60416 |
| Compton | Lee | Illinois | 779 | 61318 |
| Cornell | Livingston | Illinois | 779 | 61319 |
| Cortland | DeKalb | Illinois | 779 | 60112 |
| Crescent City | Iroquois | Illinois | 779 | 60928 |
| Crest Hill | Will | Illinois | 779 | 60403 |
| Creston | Ogle | Illinois | 779 | 60113 |
| Crystal Lake | McHenry | Illinois | 779 | 60014 |
| Crystal Lake | McHenry | Illinois | 779 | 60012 |
| Crystal Lake | Mchenry | Illinois | 779 | 60039 |
| Cullom | Livingston | Illinois | 779 | 60929 |
| Dakota | Stephenson | Illinois | 779 | 61018 |
| Dalzell | Bureau | Illinois | 779 | 61320 |
| Dana | LaSalle | Illinois | 779 | 61321 |
| Danforth | Iroquois | Illinois | 779 | 60930 |
| Davis | Stephenson | Illinois | 779 | 61019 |
| Davis Junction | Ogle | Illinois | 779 | 61020 |
| Deer Grove | Whiteside | Illinois | 779 | 61243 |
| Dekalb | DeKalb | Illinois | 779 | 60115 |
| Depue | Bureau | Illinois | 779 | 61322 |
| Dixon | Lee | Illinois | 779 | 61021 |
| Donovan | Iroquois | Illinois | 779 | 60931 |
| Dover | Bureau | Illinois | 779 | 61323 |
| Durand | Winnebago | Illinois | 779 | 61024 |
| Dwight | Livingston | Illinois | 779 | 60420 |
| Earlville | LaSalle | Illinois | 779 | 60518 |
| East Dubuque | Jo Daviess | Illinois | 779 | 61025 |
| Eldena | Lee | Illinois | 779 | 61324 |
| Eleroy | Stephenson | Illinois | 779 | 61027 |
| Elizabeth | Jo Daviess | Illinois | 779 | 61028 |
| Elwood | Will | Illinois | 779 | 60421 |
| Emington | Livingston | Illinois | 779 | 60934 |
| Esmond | Ogle | Illinois | 779 | 60129 |
| Essex | Kankakee | Illinois | 779 | 60935 |
| Fairbury | Livingston | Illinois | 779 | 61739 |
| Fenton | Whiteside | Illinois | 779 | 61251 |
| Flanagan | Livingston | Illinois | 779 | 61740 |
| Forrest | Livingston | Illinois | 779 | 61741 |
| Forreston | Ogle | Illinois | 779 | 61030 |
| Frankfort | Will | Illinois | 779 | 60423 |
| Franklin Grove | Lee | Illinois | 779 | 61031 |
| Freeport | Stephenson | Illinois | 779 | 61032 |
| Fulton | Whiteside | Illinois | 779 | 61252 |
| Galena | Jo Daviess | Illinois | 779 | 61036 |
| Galt | Whiteside | Illinois | 779 | 61037 |
| Garden Prairie | Boone | Illinois | 779 | 61038 |
| Gardner | Grundy | Illinois | 779 | 60424 |
| Genoa | DeKalb | Illinois | 779 | 60135 |
| German Valley | Stephenson | Illinois | 779 | 61039 |
| Gilman | Iroquois | Illinois | 779 | 60938 |
| Goodwine | Iroquois | Illinois | 779 | 60939 |
| Grand Ridge | LaSalle | Illinois | 779 | 61325 |
| Grant Park | Kankakee | Illinois | 779 | 60940 |
| Granville | Putnam | Illinois | 779 | 61326 |
| Graymont | Livingston | Illinois | 779 | 61743 |
| Hanover | Jo Daviess | Illinois | 779 | 61041 |
| Harmon | Lee | Illinois | 779 | 61042 |
| Harvard | McHenry | Illinois | 779 | 60033 |
| Hebron | McHenry | Illinois | 779 | 60034 |
| Hennepin | Putnam | Illinois | 779 | 61327 |
| Herscher | Kankakee | Illinois | 779 | 60941 |
| Hinckley | DeKalb | Illinois | 779 | 60520 |
| Holcomb | Ogle | Illinois | 779 | 61043 |
| Hooppole | Henry | Illinois | 779 | 61258 |
| Hopkins Park | Kankakee | Illinois | 779 | 60944 |
| Iroquois | Iroquois | Illinois | 779 | 60945 |
| Joliet | Will | Illinois | 779 | 60431 |
| Joliet | Will | Illinois | 779 | 60435 |
| Joliet | Will | Illinois | 779 | 60433 |
| Joliet | Will | Illinois | 779 | 60432 |
| Joliet | Will | Illinois | 779 | 60436 |
| Joliet | Will | Illinois | 779 | 60434 |
| Kankakee | Kankakee | Illinois | 779 | 60901 |
| Kasbeer | Bureau | Illinois | 779 | 61328 |
| Kempton | Ford | Illinois | 779 | 60946 |
| Kent | Stephenson | Illinois | 779 | 61044 |
| Kingston | DeKalb | Illinois | 779 | 60145 |
| Kinsman | Grundy | Illinois | 779 | 60437 |
| Kirkland | DeKalb | Illinois | 779 | 60146 |
| La Moille | Bureau | Illinois | 779 | 61330 |
| La Salle | LaSalle | Illinois | 779 | 61301 |
| Ladd | Bureau | Illinois | 779 | 61329 |
| Lanark | Carroll | Illinois | 779 | 61046 |
| Leaf River | Ogle | Illinois | 779 | 61047 |
| Lee | Lee | Illinois | 779 | 60530 |
| Lee Center | Lee | Illinois | 779 | 61331 |
| Leland | LaSalle | Illinois | 779 | 60531 |
| Lena | Stephenson | Illinois | 779 | 61048 |
| Leonore | LaSalle | Illinois | 779 | 61332 |
| Lindenwood | Ogle | Illinois | 779 | 61049 |
| Lockport | Will | Illinois | 779 | 60441 |
| Long Point | Livingston | Illinois | 779 | 61333 |
| Lostant | LaSalle | Illinois | 779 | 61334 |
| Loves Park | Winnebago | Illinois | 779 | 61111 |
| Loves Park | Winnebago | Illinois | 779 | 61131 |
| Loves Park | Winnebago | Illinois | 779 | 61132 |
| Loves Park | Winnebago | Illinois | 779 | 61130 |
| Lyndon | Whiteside | Illinois | 779 | 61261 |
| Machesney Park | Winnebago | Illinois | 779 | 61115 |
| Magnolia | Putnam | Illinois | 779 | 61336 |
| Malden | Bureau | Illinois | 779 | 61337 |
| Malta | DeKalb | Illinois | 779 | 60150 |
| Manhattan | Will | Illinois | 779 | 60442 |
| Manlius | Bureau | Illinois | 779 | 61338 |
| Manteno | Kankakee | Illinois | 779 | 60950 |
| Maple Park | Kane | Illinois | 779 | 60151 |
| Marengo | McHenry | Illinois | 779 | 60152 |
| Mark | Putnam | Illinois | 779 | 61340 |
| Marseilles | LaSalle | Illinois | 779 | 61341 |
| Martinton | Iroquois | Illinois | 779 | 60951 |
| Mazon | Grundy | Illinois | 779 | 60444 |
| McConnell | Stephenson | Illinois | 779 | 61050 |
| Mchenry | McHenry | Illinois | 779 | 60050 |
| Mchenry | McHenry | Illinois | 779 | 60051 |
| McNabb | Putnam | Illinois | 779 | 61335 |
| Mendota | LaSalle | Illinois | 779 | 61342 |
| Milford | Iroquois | Illinois | 779 | 60953 |
| Milledgeville | Carroll | Illinois | 779 | 61051 |
| Millington | LaSalle | Illinois | 779 | 60537 |
| Minooka | Kendall | Illinois | 779 | 60447 |
| Momence | Kankakee | Illinois | 779 | 60954 |
| Monroe Center | Ogle | Illinois | 779 | 61052 |
| Morris | Grundy | Illinois | 779 | 60450 |
| Morrison | Whiteside | Illinois | 779 | 61270 |
| Mount Carroll | Carroll | Illinois | 779 | 61053 |
| Mount Morris | Ogle | Illinois | 779 | 61054 |
| Nachusa | Lee | Illinois | 779 | 61057 |
| New Bedford | Bureau | Illinois | 779 | 61346 |
| New Lenox | Will | Illinois | 779 | 60451 |
| Newark | Kendall | Illinois | 779 | 60541 |
| Nora | Jo Daviess | Illinois | 779 | 61059 |
| Odell | Livingston | Illinois | 779 | 60460 |
| Oglesby | LaSalle | Illinois | 779 | 61348 |
| Ohio | Bureau | Illinois | 779 | 61349 |
| Onarga | Iroquois | Illinois | 779 | 60955 |
| Orangeville | Stephenson | Illinois | 779 | 61060 |
| Oregon | Ogle | Illinois | 779 | 61061 |
| Ottawa | LaSalle | Illinois | 779 | 61350 |
| Papineau | Iroquois | Illinois | 779 | 60956 |
| Paw Paw | Lee | Illinois | 779 | 61353 |
| Pearl City | Stephenson | Illinois | 779 | 61062 |
| Pecatonica | Winnebago | Illinois | 779 | 61063 |
| Pembroke Township | Kankakee | Illinois | 779 | 60958 |
| Peru | LaSalle | Illinois | 779 | 61354 |
| Piper City | Ford | Illinois | 779 | 60959 |
| Plainfield | Will | Illinois | 779 | 60544 |
| Plainfield | Will | Illinois | 779 | 60585 |
| Plainfield | Will | Illinois | 779 | 60586 |
| Polo | Ogle | Illinois | 779 | 61064 |
| Pontiac | Livingston | Illinois | 779 | 61764 |
| Poplar Grove | Boone | Illinois | 779 | 61065 |
| Princeton | Bureau | Illinois | 779 | 61356 |
| Prophetstown | Whiteside | Illinois | 779 | 61277 |
| Putnam | Putnam | Illinois | 779 | 61560 |
| Ransom | LaSalle | Illinois | 779 | 60470 |
| Reddick | Kankakee | Illinois | 779 | 60961 |
| Richmond | McHenry | Illinois | 779 | 60071 |
| Ridott | Stephenson | Illinois | 779 | 61067 |
| Ringwood | McHenry | Illinois | 779 | 60072 |
| Rochelle | Ogle | Illinois | 779 | 61068 |
| Rock City | Stephenson | Illinois | 779 | 61070 |
| Rock Falls | Whiteside | Illinois | 779 | 61071 |
| Rockford | Winnebago | Illinois | 779 | 61112 |
| Rockford | Winnebago | Illinois | 779 | 61101 |
| Rockford | Winnebago | Illinois | 779 | 61102 |
| Rockford | Winnebago | Illinois | 779 | 61107 |
| Rockford | Winnebago | Illinois | 779 | 61108 |
| Rockford | Winnebago | Illinois | 779 | 61114 |
| Rockford | Winnebago | Illinois | 779 | 61103 |
| Rockford | Winnebago | Illinois | 779 | 61104 |
| Rockford | Winnebago | Illinois | 779 | 61109 |
| Rockford | Winnebago | Illinois | 779 | 61105 |
| Rockford | Winnebago | Illinois | 779 | 61110 |
| Rockford | Winnebago | Illinois | 779 | 61125 |
| Rockford | Winnebago | Illinois | 779 | 61106 |
| Rockford | Winnebago | Illinois | 779 | 61126 |
| Rockton | Winnebago | Illinois | 779 | 61072 |
| Romeoville | Will | Illinois | 779 | 60446 |
| Roscoe | Winnebago | Illinois | 779 | 61073 |
| Rutland | Marshall | Illinois | 779 | 61358 |
| Saint Anne | Kankakee | Illinois | 779 | 60964 |
| Sandwich | DeKalb | Illinois | 779 | 60548 |
| Saunemin | Livingston | Illinois | 779 | 61769 |
| Savanna | Carroll | Illinois | 779 | 61074 |
| Scales Mound | Jo Daviess | Illinois | 779 | 61075 |
| Seatonville | Bureau | Illinois | 779 | 61359 |
| Seneca | LaSalle | Illinois | 779 | 61360 |
| Serena | LaSalle | Illinois | 779 | 60549 |
| Seward | Winnebago | Illinois | 779 | 61077 |
| Shabbona | DeKalb | Illinois | 779 | 60550 |
| Shannon | Carroll | Illinois | 779 | 61078 |
| Sheffield | Bureau | Illinois | 779 | 61361 |
| Sheldon | Iroquois | Illinois | 779 | 60966 |
| Sheridan | LaSalle | Illinois | 779 | 60551 |
| Shirland | Winnebago | Illinois | 779 | 61079 |
| Shorewood | Will | Illinois | 779 | 60404 |
| Somonauk | DeKalb | Illinois | 779 | 60552 |
| South Beloit | Winnebago | Illinois | 779 | 61080 |
| South Wilmington | Grundy | Illinois | 779 | 60474 |
| Spring Grove | McHenry | Illinois | 779 | 60081 |
| Spring Valley | Bureau | Illinois | 779 | 61362 |
| Standard | Putnam | Illinois | 779 | 61363 |
| Sterling | Whiteside | Illinois | 779 | 61081 |
| Steward | Lee | Illinois | 779 | 60553 |
| Stillman Valley | Ogle | Illinois | 779 | 61084 |
| Stockland | Iroquois | Illinois | 779 | 60967 |
| Stockton | Jo Daviess | Illinois | 779 | 61085 |
| Strawn | Livingston | Illinois | 779 | 61775 |
| Streator | LaSalle | Illinois | 779 | 61364 |
| Sublette | Lee | Illinois | 779 | 61367 |
| Sycamore | DeKalb | Illinois | 779 | 60178 |
| Tampico | Bureau | Illinois | 779 | 61283 |
| Thomson | Carroll | Illinois | 779 | 61285 |
| Tiskilwa | Bureau | Illinois | 779 | 61368 |
| Toluca | Marshall | Illinois | 779 | 61369 |
| Tonica | LaSalle | Illinois | 779 | 61370 |
| Triumph | LaSalle | Illinois | 779 | 61371 |
| Troy Grove | LaSalle | Illinois | 779 | 61372 |
| Union | McHenry | Illinois | 779 | 60180 |
| Union Hill | Kankakee | Illinois | 779 | 60969 |
| Utica | LaSalle | Illinois | 779 | 61373 |
| Van Orin | Bureau | Illinois | 779 | 61374 |
| Verona | Grundy | Illinois | 779 | 60479 |
| Walnut | Bureau | Illinois | 779 | 61376 |
| Warren | Jo Daviess | Illinois | 779 | 61087 |
| Waterman | DeKalb | Illinois | 779 | 60556 |
| Watseka | Iroquois | Illinois | 779 | 60970 |
| Wedron | LaSalle | Illinois | 779 | 60557 |
| Wellington | Iroquois | Illinois | 779 | 60973 |
| Wenona | Marshall | Illinois | 779 | 61377 |
| West Brooklyn | Lee | Illinois | 779 | 61378 |
| Wilmington | Will | Illinois | 779 | 60481 |
| Winnebago | Winnebago | Illinois | 779 | 61088 |
| Winslow | Stephenson | Illinois | 779 | 61089 |
| Wonder Lake | McHenry | Illinois | 779 | 60097 |
| Woodland | Iroquois | Illinois | 779 | 60974 |
| Woodstock | McHenry | Illinois | 779 | 60098 |
| Woosung | Ogle | Illinois | 779 | 61091 |
| Wyanet | Bureau | Illinois | 779 | 61379 |