- 1 3,234 businesses in Dupage County had between 20 and 49 employees in 2016
- 2 1,036 businesses in Dekalb County had fewer than five employees in 2016
- 3 NEA estimates Illinois K-12 schools spent $35.7 billion in 2018-19
- 4 One business in De Witt County had more than 500 employees in 2016
- 5 Census Bureau: Galesburg, Illinois saw more residents between ages 55 and 64 in 2017
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