States101 
Illinois
State Facts
There are fewer men than woman in Illinois. The overall gender ratio is 96 men to 100 women.
The Illinois flag was adopted on June 27, 1969. The flag has been ranked the 34th best U.S. flag by a leading Vexillology Organization.
The Illinois quarter was the 21st quarter released overall. The quarter was released on January 2, 2003.
Recent estimates put Illinois's population at around 12,881,000 people (5th out of 56).The population density is 232.0 people per square mile (18th out of 56).
Someone from Illinois is known as a Illinoisan. View our List of Adjectival and Demonyms for all the States.
Illinois was the 21st state when it joined the United States on December 3, 1818. Prior to 1818, Illinois was known as "Illinois Territory."
Essential Illinois Facts
-
IL
Postal Code
The Illinois postal code is IL. This abbreviation has been used since the USPS first established official codes in October 1963. -
Gender Ratio
Gender Ratio: 96 Men to 100 Women
Male Population: 6,320,886 men
Female Population: 6,559,694 women
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State Flag
The 7 main colors in the Illinois flag are #FFFFFF, #785A3C, #BE0A2F, #FFE60F, #B4B4B4, #000000, and #002768 -
State Quarter
The Illinois Quarter was released in January 01, 2003.
Total Mintage: 0.46 billion.
Engraver: Donna Weaver -
Population and Area
Population: 12,880,580 people
Land Area: 55,519 square miles
Population Density: 12,880,580 people per square mile
Areas Codes in Illinois (15)
- 217
- 224
- 309
- 312
- 314
- 331
- 563
- 608
- 618
- 630
- 708
- 773
- 779
- 815
- 847
Illinois Counties (102)
| County | Top Cities |
|---|---|
| Adams County | Camp Point, Clayton, Coatsburg, Fowler, Golden, and La Prairie |
| Alexander County | Cairo, Mc Clure, Miller City, Olive Branch, Tamms, and Thebes |
| Bond County | Donnellson, Greenville, Keyesport, Pierron, Pocahontas, and Smithboro |
| Boone County | Belvidere, Caledonia, Capron, Garden Prairie, and Poplar Grove |
| Brown County | Mount Sterling, Timewell, and Versailles |
| Bureau County | Arlington, Bradford, Buda, Bureau, Cherry, and Dalzell |
| Calhoun County | Batchtown, Brussels, Golden Eagle, Hamburg, Hardin, and Kampsville |
| Carroll County | Chadwick, Lanark, Milledgeville, Mount Carroll, Savanna, and Shannon |
| Cass County | Arenzville, Ashland, Beardstown, Bluff Springs, Chandlerville, and Virginia |
| Champaign County | Bondville, Broadlands, Champaign, Dewey, Fisher, and Foosland |
| Christian County | Assumption, Bulpitt, Edinburg, Harvel, Kincaid, and Morrisonville |
| Clark County | Casey, Dennison, Marshall, Martinsville, West Union, and West York |
| Clay County | Clay City, Edgewood, Flora, Ingraham, Louisville, and Sailor Springs |
| Clinton County | Albers, Aviston, Bartelso, Beckemeyer, Breese, and Carlyle |
| Coles County | Ashmore, Charleston, Humboldt, Janesville, Lerna, and Mattoon |
| Cook County | Alsip, Arlington Heights, Barrington, Bedford Park, Bellwood, and Berkeley |
| Crawford County | Annapolis, Flat Rock, Hutsonville, Oblong, Palestine, and Robinson |
| Cumberland County | Greenup, Jewett, Neoga, Sigel, Toledo, and Trilla |
| DeKalb County | Clare, Cortland, Dekalb, Genoa, Hinckley, and Kingston |
| De Witt County | Clinton, Dewitt, Farmer City, Kenney, Lane, and Wapella |
| Douglas County | Arcola, Arthur, Atwood, Camargo, Hindsboro, and Murdock |
| DuPage County | Addison, Aurora, Bartlett, Bensenville, Bloomingdale, and Carol Stream |
| Edgar County | Brocton, Chrisman, Hume, Kansas, Metcalf, and Paris |
| Edwards County | Albion, Bone Gap, Browns, Grayville, and West Salem |
| Effingham County | Altamont, Beecher City, Dieterich, Effingham, Mason, and Shumway |
| Fayette County | Bingham, Brownstown, Farina, Hagarstown, Mulberry Grove, and Ramsey |
| Ford County | Cabery, Elliott, Gibson City, Kempton, Melvin, and Paxton |
| Franklin County | Benton, Buckner, Christopher, Coello, Ewing, and Frankfort Heights |
| Fulton County | Astoria, Bryant, Canton, Cuba, Dunfermline, and Ellisville |
| Gallatin County | Equality, Junction, New Haven, Omaha, Ridgway, and Shawneetown |
| Greene County | Carrollton, Eldred, Greenfield, Hillview, Kane, and Patterson |
| Grundy County | Braceville, Coal City, Gardner, Kinsman, Mazon, and Minooka |
| Hamilton County | Broughton, Dahlgren, Dale, Macedonia, Mc Leansboro, and Springerton |
| Hancock County | Augusta, Basco, Bowen, Carthage, Colusa, and Dallas City |
| Hardin County | Cave In Rock, Elizabethtown, Karbers Ridge, and Rosiclare |
| Henderson County | Biggsville, Carman, Gladstone, Lomax, Media, and Oquawka |
| Henry County | Alpha, Andover, Annawan, Atkinson, Bishop Hill, and Cambridge |
| Iroquois County | Ashkum, Beaverville, Buckley, Cissna Park, Claytonville, and Clifton |
| Jackson County | Ava, Campbell Hill, Carbondale, De Soto, Dowell, and Elkville |
| Jasper County | Hidalgo, Montrose, Newton, Sainte Marie, West Liberty, and Wheeler |
| Jefferson County | Belle Rive, Bluford, Bonnie, Dix, Ina, and Mount Vernon |
| Jersey County | Brighton, Dow, Elsah, Fidelity, Fieldon, and Grafton |
| Jo Daviess County | Apple River, East Dubuque, Elizabeth, Galena, Hanover, and Nora |
| Johnson County | Boles, Buncombe, Cypress, Goreville, Grantsburg, and New Burnside |
| Kane County | Aurora, Batavia, Big Rock, Burlington, Carpentersville, and Dundee |
| Kankakee County | Aroma Park, Bonfield, Bourbonnais, Bradley, Buckingham, and Chebanse |
| Kendall County | Bristol, Millbrook, Montgomery, Newark, Oswego, and Plano |
| Knox County | Abingdon, Altona, Dahinda, East Galesburg, Galesburg, and Gilson |
| Lake County | Antioch, Buffalo Grove, Deerfield, Fort Sheridan, Fox Lake, and Grayslake |
| LaSalle County | Cedar Point, Dana, Earlville, Grand Ridge, La Salle, and Leland |
| Lawrence County | Bridgeport, Lawrenceville, Saint Francisville, and Sumner |
| Lee County | Amboy, Ashton, Compton, Dixon, Eldena, and Franklin Grove |
| Livingston County | Ancona, Blackstone, Campus, Chatsworth, Cornell, and Cullom |
| Logan County | Atlanta, Beason, Chestnut, Cornland, Elkhart, and Emden |
| Macon County | Argenta, Blue Mound, Boody, Decatur, Elwin, and Forsyth |
| Macoupin County | Benld, Bunker Hill, Carlinville, Chesterfield, Eagarville, and Gillespie |
| Madison County | Alhambra, Alton, Bethalto, Collinsville, Cottage Hills, and Dorsey |
| Marion County | Alma, Centralia, Iuka, Kell, Kinmundy, and Odin |
| Marshall County | Camp Grove, Henry, La Rose, Lacon, Sparland, and Toluca |
| Mason County | Bath, Easton, Forest City, Havana, Kilbourne, and Manito |
| Massac County | Belknap, Brookport, and Metropolis |
| McDonough County | Adair, Bardolph, Blandinsville, Bushnell, Colchester, and Good Hope |
| McHenry County | Alden, Algonquin, Cary, Crystal Lake, Fox River Grove, and Harvard |
| McLean County | Anchor, Arrowsmith, Bellflower, Bloomington, Carlock, and Chenoa |
| Menard County | Athens, Greenview, Lincolns New Salem, Oakford, Petersburg, and Tallula |
| Mercer County | Aledo, Joy, Keithsburg, Matherville, New Boston, and New Windsor |
| Monroe County | Columbia, Fults, Hecker, Maeystown, Renault, and Valmeyer |
| Montgomery County | Butler, Coffeen, Farmersville, Fillmore, Hillsboro, and Irving |
| Morgan County | Alexander, Chapin, Concord, Franklin, Jacksonville, and Literberry |
| Moultrie County | Bethany, Dalton City, Gays, Lovington, and Sullivan |
| Ogle County | Baileyville, Byron, Chana, Creston, Davis Junction, and Esmond |
| Peoria County | Brimfield, Chillicothe, Dunlap, East Peoria, Edelstein, and Edwards |
| Perry County | Coulterville, Cutler, Du Quoin, Pinckneyville, Tamaroa, and Willisville |
| Piatt County | Bement, Cerro Gordo, Cisco, De Land, Hammond, and La Place |
| Pike County | Barry, Baylis, Chambersburg, Griggsville, Hull, and Kinderhook |
| Pope County | Eddyville, Golconda, and Herod |
| Pulaski County | Grand Chain, Joppa, Karnak, Mound City, Mounds, and Olmsted |
| Putnam County | Granville, Hennepin, Magnolia, Mark, Mc Nabb, and Putnam |
| Randolph County | Baldwin, Chester, Ellis Grove, Evansville, Menard, and Modoc |
| Richland County | Calhoun, Claremont, Dundas, Noble, Olney, and Parkersburg |
| Rock Island County | Andalusia, Barstow, Buffalo Prairie, Carbon Cliff, Coal Valley, and Cordova |
| Saline County | Carrier Mills, Eldorado, Galatia, Harrisburg, Muddy, and Raleigh |
| Sangamon County | Auburn, Buffalo, Cantrall, Chatham, Dawson, and Divernon |
| Schuyler County | Browning, Camden, Frederick, Huntsville, Littleton, and Rushville |
| Scott County | Alsey, Bluffs, Manchester, and Winchester |
| Shelby County | Cowden, Findlay, Herrick, Lakewood, Mode, and Moweaqua |
| Stark County | Castleton, La Fayette, Speer, Toulon, and Wyoming |
| St. Clair County | Belleville, Caseyville, Dupo, East Carondelet, East Saint Louis, and Fairview Heights |
| Stephenson County | Cedarville, Dakota, Davis, Eleroy, Freeport, and German Valley |
| Tazewell County | Armington, Creve Coeur, Delavan, East Peoria, Green Valley, and Groveland |
| Union County | Alto Pass, Anna, Cobden, Dongola, Jonesboro, and Millcreek |
| Vermilion County | Allerton, Alvin, Armstrong, Bismarck, Catlin, and Collison |
| Wabash County | Allendale, Bellmont, Keensburg, Lancaster, and Mount Carmel |
| Warren County | Alexis, Avon, Berwick, Cameron, Gerlaw, and Kirkwood |
| Washington County | Addieville, Ashley, Du Bois, Hoyleton, Irvington, and Nashville |
| Wayne County | Barnhill, Cisne, Ellery, Fairfield, Geff, and Golden Gate |
| White County | Burnt Prairie, Carmi, Crossville, Emma, Enfield, and Maunie |
| Whiteside County | Albany, Deer Grove, Erie, Fenton, Fulton, and Galt |
| Williamson County | Cambria, Carbondale, Carterville, Colp, Creal Springs, and Energy |
| Will County | Aurora, Beecher, Bolingbrook, Braidwood, Channahon, and Crest Hill |
| Winnebago County | Cherry Valley, Durand, Loves Park, Machesney Park, Pecatonica, and Rockford |
| Woodford County | Benson, Congerville, Deer Creek, El Paso, Eureka, and Goodfield |