The following locations have registered studies:

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Illinois is a state in the Midwestern United States. The 25th most extensive state, it is the 5th most populous with the United States Census Bureau estimating that the population of Illinois was 12,882,135 on July 1, 2013, a 0.3% increase since the 2010 United States Census. Illinois is the most populous state in the Midwest region. Chicago, the third most populous city in the United States, is the centre of the Chicago metropolitan area. Chicagoland, as this area is known locally, comprises only 8% of the land area of the state, but contains 65% of the state's residents.

According to the 2010 Census, the racial composition of the state was:

  • 71.5% White American (63.7% non-Hispanic white, 7.8% White Hispanic)
  • 14.5% Black or African American
  • 0.3% American Indian and Alaska Native
  • 4.6% Asian American
  • 2.3% Multiracial American
  • 6.8% some other race

With Chicago in the north east, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal, timber, and petroleum in the south, Illinois has a diverse economic base and is a major transportation hub.

Illinois is bordered on the east by the state of Indiana and to the south by Kentucky. Most of the western border with Missouri and Iowa is the Mississippi River; Kaskaskia is an exclave of Illinois, lying west of the Mississippi and reachable only from Missouri. The north eastern border of Illinois lies within Lake Michigan, within which Illinois shares a water boundary with the state of Michigan.

The following locations have registered studies: