Which county charges the most property taxes?

It's a little tricky to compare county property tax rates in suburban Philadelphia.

You might think the county with the lowest millage rate — Delaware County at 2.999 mills — would have a lower property tax burden than Bucks County, which has a millage rate of 25.45. However,  that's not the case, because Bucks County has a much smaller assessment ratio, meaning the taxable value of the home is just a fraction of the market value. 

That assessment ratio is based on the common level ratio (CLR), which is set annually for each county by the state.

The chart below incorporates assessment ratios and millage rates to give an approximate comparison of the taxes each county would charge on a home with a market value of about $300,000.