Do you live in the Chicagoland area in Illinois? Odds are you have a much higher home value than the rest of the state. When taking a look at the 25 Illinois counties with the average highest home values, the majority of them are in the northeastern quadrant of the state.
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.
If you're an Illinois resident with a high property tax bill, chances are strong you live in one of the collar counties surrounding Chicago. That's not an end-all-be-all statement, but based on data from Tax-Rates.org, it's a pretty safe assumption.