Illinois Area Codes, United States

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    Find the real owner of someone with a 217 and 447, 309 and 312, 618,

    630 and 331, 708, 773, 779 and 815, 224 and 847 Illinois area codes.

    Illinois area code

    Illinois was the twenty-first state to join the Union in 1818. The Land of Lincoln is home to some 13 million residents, and 14 Illinois area codes connect these residents. Illinois area codes are useful to identify a caller’s city or town in Illinois. But that’s where it ends. If you want additional details, you will need to check an Illinois phone numbers database.

    Before cellphones became popular in the late 1990s, phone calls happened on switchboards. Essentially, if you needed to call someone, you first dialed an operator who manually routes your call to the recipient. Despite its initial success, manual switchboards could not handle a high volume of calls. Besides, there was the issue of privacy – an operator could listen in on conversations.

    Given these issues, a numbering plan that used area codes soon replaced switchboards and made calls a straightforward process. More importantly, it also improved callers’ privacy since humans did not route phone calls.

    Take your typical ten-digit Springfield phone number, 217-NYY-XXXX, and think of it as a physical address.

    217 is the area code, representing a small geographical area within Illinois – in this case, Springfield. The next three digits, NYY, make up the prefix code. This prefix code helps narrow down the phone number owner to a particular town or street in Springfield.

    The last four digits, XXXX, is the line number, a unique identifier for every phone number owner. If a phone number were a house address, the line number would be a house number, flat number, or room number.

    Illinois started with four area codes in 1947. As the state’s population grew, Illinois has since created 14 Illinois area codes using overlay and geographic split. Residents retained old area codes if they wish, but they can always opt for new area codes in their city or town.

    Besides connecting you with the person you wish to call, area codes also let you identify an unknown caller’s location. But you will need a reverse phone search to get more specific with the prefix code and line number.  

    Several persons can have the same area code if they live in the same area. Likewise, several persons can have the same prefix code if they are neighbors. However, no two persons can have the same line number. With a phone number search on an Illinois phone numbers database, you can get a phone number owner’s information. This includes the caller’s physical address, social media profiles, and relevant public records.

    CountyFIPS codeCounty seatEstablishedPopulationArea
    Adams County011Quincy182565,691855 sq mi
    Alexander County003Cairo18196,060235 sq mi
    Bond County005Greenville181716,630380 sq mi
    Boone County007Belvidere183753,577280 sq mi
    Brown County009Mount Sterling18396,556305 sq mi
    Bureau County011Princeton183732,993869 sq mi
    Calhoun County013Hardin18254,802253 sq mi
    Carroll County015Mount Carroll183914,312445 sq mi
    Cass County017Virginia183712,260375 sq mi
    Champaign County019Urbana1833209,983996 sq mi
    Christian County021Taylorville183932,661709 sq mi
    Clark County023Marshall181915,596501 sq mi
    Clay County025Louisville182413,253468 sq mi
    Clinton County027Carlyle182437,639474 sq mi
    Coles County029Charleston183050,885508 sq mi
    Cook County031Chicago18315,180,493944 sq mi
    Crawford County033Robinson181618,807443 sq mi
    Cumberland County035Toledo184310,808345 sq mi
    DeKalb County037Sycamore1837104,143631 sq mi
    DeWitt County039Clinton183915,769397 sq mi
    Douglas County041Tuscola185919,479416 sq mi
    DuPage County043Wheaton1839928,589327 sq mi
    Edgar County045Paris182317,360623 sq mi
    Edwards County047Albion18146,392222 sq mi
    Effingham County049Effingham183134,208478 sq mi
    Fayette County051Vandalia182121,416716 sq mi
    Ford County053Paxton185913,264485 sq mi
    Franklin County055Benton181838,701408 sq mi
    Fulton County057Lewistown182334,844865 sq mi
    Gallatin County059Shawneetown18125,058322 sq mi
    Greene County061Carrollton182113,044543 sq mi
    Grundy County063Morris184150,972418 sq mi
    Hamilton County065McLeansboro18218,163434 sq mi
    Hancock County067Carthage182517,844793 sq mi
    Hardin County069Elizabethtown18393,910177 sq mi
    Henderson County071Oquawka18416,709378 sq mi
    Henry County073Cambridge182549,090822 sq mi
    Iroquois County075Watseka183327,6041,117 sq mi
    Jackson County077Murphysboro181657,419584 sq mi
    Jasper County079Newton18319,611494 sq mi
    Jefferson County081Mount Vernon181937,820571 sq mi
    Jersey County083Jerseyville183921,847369 sq mi
    Jo Daviess County085Galena182721,366600 sq mi
    Johnson County087Vienna181212,456343 sq mi
    Kane County089Geneva1836534,216519 sq mi
    Kankakee County091Kankakee1853110,024676 sq mi
    Kendall County093Yorkville1841127,915320 sq mi
    Knox County095Galesburg182550,112716 sq mi
    Lake County097Waukegan1839700,832443 sq mi
    LaSalle County099Ottawa1831109,4301,135 sq mi
    Lawrence County101Lawrenceville182115,765372 sq mi
    Lee County103Dixon183934,223724 sq mi
    Livingston County105Pontiac183735,7611,043 sq mi
    Logan County107Lincoln183928,925618 sq mi
    Macon County115Decatur1829104,712580 sq mi
    Macoupin County117Carlinville182945,313862 sq mi
    Madison County119Edwardsville1812264,461716 sq mi
    Marion County121Salem182337,620572 sq mi
    Marshall County123Lacon183911,534386 sq mi
    Mason County125Havana184113,565539 sq mi
    Massac County127Metropolis184314,080237 sq mi
    McDonough County109Macomb182629,955589 sq mi
    McHenry County111Woodstock1836308,570603 sq mi
    McLean County113Bloomington1830172,8281,183 sq mi
    Menard County129Petersburg183912,288314 sq mi
    Mercer County131Aledo182515,601561 sq mi
    Monroe County133Waterloo181634,335385 sq mi
    Montgomery County135Hillsboro182128,601703 sq mi
    Morgan County137Jacksonville182333,976568 sq mi
    Moultrie County139Sullivan184314,717335 sq mi
    Ogle County141Oregon183650,923758 sq mi
    Peoria County143Peoria1825180,621618 sq mi
    Perry County145Pinckneyville182721,174441 sq mi
    Piatt County147Monticello184116,396439 sq mi
    Pike County149Pittsfield182115,611831 sq mi
    Pope County151Golconda18164,212368 sq mi
    Pulaski County153Mound City18435,463199 sq mi
    Putnam County155Hennepin18255,740160 sq mi
    Randolph County157Chester179532,106575 sq mi
    Richland County159Olney184115,763360 sq mi
    Rock Island County161Rock Island1831143,477427 sq mi
    Saline County165Harrisburg184723,906379 sq mi
    Sangamon County167Springfield1821195,348868 sq mi
    Schuyler County169Rushville18256,907437 sq mi
    Scott County171Winchester18394,926250 sq mi
    Shelby County173Shelbyville182721,741758 sq mi
    St. Clair County163Belleville1790261,059657 sq mi
    Stark County175Toulon18395,427288 sq mi
    Stephenson County177Freeport183744,753564 sq mi
    Tazewell County179Pekin1827132,328646 sq mi
    Union County181Jonesboro181816,841413 sq mi
    Vermilion County183Danville182676,806898 sq mi
    Wabash County185Mount Carmel182411,549223 sq mi
    Warren County187Monmouth182517,032542 sq mi
    Washington County189Nashville181813,995562 sq mi
    Wayne County191Fairfield181916,332713 sq mi
    White County193Carmi181513,665494 sq mi
    Whiteside County195Morrison183655,626684 sq mi
    Will County197Joliet1836692,310835 sq mi
    Williamson County199Marion183967,056420 sq mi
    Winnebago County201Rockford1836284,081513 sq mi
    Woodford County203Eureka184138,463527 sq mi

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