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☰ Menu US Gazetteer Illinois Counties Cities ZIP Codes Features US > Illinois Illinois Gazetteer Illinois - Basic Information Became a State: December 3, 1818 - 21st State Population: 12,830,632 (2010 Census) - Ranks 5th Land Area: 55,518.9 square miles - Ranks 24th Population Density: 231.1 persons per square mile - Ranks 12nd Housing Units: 5,296,715 (2010 Census) Housing Unit Density: 95.4 housing units per square mile July 1, 2019 Estimates: Illinois Data and Demographics State Capital: Springfield State Website: Official State of Illinois Website Illinois State Flag Quick & Easy Ways to... Get Current Demographic Data for Cities, Towns, and ZIP Codes View Boundary Maps, for Cities, Towns, and ZIP Codes Locate Physical, Cultural, and Historical Features Use HTL Address Research for a Illinois Address and get... Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood , city, county, ZIP Code, and school zone. July 1, 2019, data includes home values, household income, percentage of homes owned, rented or vacant , etc. Illinois History Illinois State Flower - Illinois Native Violet The area of Illinois was part of the original territory of the United States, being part of lands ceded by four states to the United States and designated in 1787 as the "Territory northwest of the River Ohio." Illinois Territory was organized on February 3, 1809, from the western part of Indiana Territory, and included all of present-day Illinois, most of Wisconsin, the western part of the Upper Peninsula of Michigan, and northeastern Minnesota. Although the territory had not yet been legally established, census data for Illinois are available beginning with the 1800 census. The 1810 population is for the entire area of the Illinois Territory, including territory not in the present state. For an explanation of the revision to the 1800 population of Illinois, see Richard L. Forstall, Population of States and Counties of the United States: 1790-1990, Washington, DC: U.S. Government Printing Office, 1996, page 48. Data for the legally established state of Illinois are available beginning with the 1820 census. Illinois Geographical Areas See: Geographic Terms & Concepts Counties & County Equivalents Interactive Map of Illinois Counties | Static Overview Map of Illinois Counties There are 102 counties in Illinois. All counties are functioning governmental units; each is governed by a board with between 5 and 29 members. Adams Alexander Bond Boone Brown Bureau Calhoun Carroll Cass Champaign Christian Clark Clay Clinton Coles Cook Crawford Cumberland De Witt DeKalb Douglas DuPage Edgar Edwards Effingham Fayette Ford Franklin Fulton Gallatin Greene Grundy Hamilton Hancock Hardin Henderson Henry Iroquois Jackson Jasper Jefferson Jersey Jo Daviess Johnson Kane Kankakee Kendall Knox Lake LaSalle Lawrence Lee Livingston Logan Macon Macoupin Madison Marion Marshall Mason Massac McDonough McHenry McLean Menard Mercer Monroe Montgomery Morgan Moultrie Ogle Peoria Perry Piatt Pike Pope Pulaski Putnam Randolph Richland Rock Island Saline Sangamon Schuyler Scott Shelby St. Clair Stark Stephenson Tazewell Union Vermilion Wabash Warren Washington Wayne White Whiteside Will Williamson Winnebago Woodford -- Select County -- Adams Alexander Bond Boone Brown Bureau Calhoun Carroll Cass Champaign Christian Clark Clay Clinton Coles Cook Crawford Cumberland De Witt DeKalb Douglas DuPage Edgar Edwards Effingham Fayette Ford Franklin Fulton Gallatin Greene Grundy Hamilton Hancock Hardin Henderson Henry Iroquois Jackson Jasper Jefferson Jersey Jo Daviess Johnson Kane Kankakee Kendall Knox Lake LaSalle Lawrence Lee Livingston Logan Macon Macoupin Madison Marion Marshall Mason Massac McDonough McHenry McLean Menard Mercer Monroe Montgomery Morgan Moultrie Ogle Peoria Perry Piatt Pike Pope Pulaski Putnam Randolph Richland Rock Island Saline Sangamon Schuyler Scott Shelby St. Clair Stark Stephenson Tazewell Union Vermilion Wabash Warren Washington Wayne White Whiteside Will Williamson Winnebago Woodford County Subdivisions There are 1,710 county subdivisions in Illinois known as minor civil divisions (MCDs); 85 counties have functioning, but not necessarily active, townships and 17 counties have nonfunctioning election precincts. There are 1,432 townships and 274 election precincts. Chicago city is independent of any MCD and serves as an MCD equivalent in two counties, creating two county subdivisions. There are also two undefined MCDs that cover the Illinois portion of Lake Michigan. Alexander, Calhoun, Edwards, Hardin, Johnson, Massac, Menard, Monroe, Morgan, Perry, Pope, Pulaski, Randolph, Scott, Union, Wabash, and Williamson counties have election precincts. All other counties have townships. The governing body for each township is an elected township supervisor and a board of trustees. Places (Incorporated Cities, Towns & Census Designated Places (CDPs)) Illinois State Bird - Cardinal Illinois has 1,367 places, 1,299 incorporated places and 68 census designated places (CDPs). The incorporated places consist of 300 cities, 16 towns, and 983 villages. The minimum population to incorporate as a city is 2,500. For a village the minimum population for incorporation ranges from 200 (in counties with a population less than 150,000) to 2,500. Incorporated places are dependent within county subdivision with the following exceptions: Independent of any township Chicago city Coextensive with a single township Alton Belleville Berwyn Bloomington Champaign Cicero East St. Louis Evanston Freeport Galesburg Godfrey Macomb Oak Park Quincy River Forest Urbana Warsaw Zion Coextensive with a single precinct Cairo Golconda Valmeyer Coextensive with multiple whole precincts Jacksonville South Jacksonville Waterloo Coextensive with one more precincts in Monroe County, but also has part of one township in St. Clair County Columbia city Hecker village Contain one or more whole precincts and parts of others Du Quion Metropolis Petersburg Pinckneyville Illinois Land & Properties for Sale Click Here To Find Amazing Properties, Farms & Ranches Available Now in Illinois. Alphabetical List of Cities, Towns, CDPs and Other Populated Places A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q, R | S | T | U, V | W, X, Y, Z Illinois Civil Features Illinois Civil Features : Political Subdivisions, Native Areas, Land Grants, etc. - sorted by Census Class Codes . Metropolitan and Micropolitan Statistical Areas There are 12 Metropolitan and 18 Micropolitan Statistical Areas in Illinois. IL Metopolitan & Micropolitan Areas Illinois ZIP Code Tabulation Areas There are 1,384 ZIP Code tabulation areas (ZCTAs) in Illinois. View Illinois ZIP Codes and ZIP Code Maps . School Districts There are 379 elementary school districts, 104 secondary school districts, and 389 unified school districts in Illinois. View Illinois Public and Private Schools . Congressional Districts Illinois has 19 congressional districts. An interactive map shows the contact information for each Representative as well as the boundaries for each Illinois district. View Map of Illinois Congressional Districts . State Legislative Districts There are 59 state senate districts and 118 state house districts in Illinois. There is also one state house district undefined and one state senate district undefined each comprising the portion of Illinois in Lake Michigan. Illinois Physical, Cultural and Historic Features Illinois Physical Features such as lakes, islands, streams, valleys, summits, etc. Illinois Cultural Features such as schools, churches, hospitals, parks, dams, reservoirs, etc. Illinois Historical Features and Illinois Historic Landmarks Illinois Maps OVERVIEW Map of Illinois Counties INTERACTIVE Maps of Illinois Counties Illinois Congressional Districts To find a ZIP Code: input the address in the top-left search box of any ZIP Code Map . To find the County: input the address in the top-lef...