The Wisconsin Department of Revenue (DOR) publishes annual reports for counties that have adopted the 0.5% optional sales tax. This link also has information about the sales and use tax more generally.
The Wisconsin Department of Administration (DOA) releases population and housing unit estimate reports.
“The Demographic Services Center annually produces population estimates for Wisconsin counties and municipalities. The estimates are based on the prior census and analysis of contemporary data including housing units, dormitory and institutional populations, automobile registrations, residential electric meters and other indicators of population change. DSC releases preliminary populat