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The total population of Illinois in 2003 was approximately 12,653,544. This is quite impressing since the population was more than people expected. This is also impressing because it has more population than Bolivia. If this number is true then Illinois has 4 million more people than Bolivia. The population is this big because of its five main counties, Cook, Du Page, Lake, Will and Kane all of these contain at least a million each. Then they are big in population because they have the major cities inside them, Chicago, Rockford, Aurora, Peoria and Springfield(the capital). In 2000 the population was of about 12,419,293 which was an increase since 1990 of about 988,691. In the census of 2000 there was an estimate of about 1,529,058 foreign born residents. This made up 12 percent of the state's population. Compared to Bolivia this is kind of big. There was also an estimate of 2,477,000 in Illinois that were immigrant stock. That means that children in those families were born after their arrival in Illinois.