The progressive tax versus flat tax debate is raging on — if Illinois moves towards a progressive tax system, where taxes vary based on income, counties with higher median incomes will probably have a lot to say.

Here are the nine counties in Illinois with the highest median household incomes, according to the 2012 census. Under a progressive tax system, people living in these counties would likely be paying more in taxes.

Highest median incomes in Illinois

Reboot Illinois held a debate over the progressive tax versus flat tax argument. Here are the highlights.

Which counties in Illinois have the highest property taxes? We’ve got the answers right here!

Don’t let our taxes get any higher. Head over to Sound Off and tell your legislators!

90-second drill: What would it take to bring a progressive income tax system to Illinois?

Are the Republican candidates for governor going to raise taxes?

State fiscal conditions: How does Illinois stack up?

Check out our gallery of the best editorial cartoons from 2013.