STATS Indiana is the statistical data utility for the State of Indiana, developed and maintained since 1985 by the Indiana Business Research Center at Indiana University's Kelley School of Business.Support is or has been provided by the State of Indiana and the Lilly Endowment, the Indiana Department of Workforce Development and Indiana University. While the county does have very high home values, with a median value of $513,300, it also has high property tax rates. The average millage rate in the county is over 80 mills. Erie County. The average effective property tax rate in Erie County is 2.63%, well above both state and national averages. The exact property tax levied depends on the county in Montana the property is located in. Missoula County collects the highest property tax in Montana, levying an average of $2,176.00 (0.93% of median home value) yearly in property taxes, while Wibaux County has the lowest property tax in the state, collecting an average tax of $505.00