It's already possible to view and pay your current property tax bill on the County's Tax Collector website. Now, with the release of the secured, unitary, and railroad property tax data, by parcel, for the County of San Mateo, as of January 1, 2015 lien date, you can view previous year's data, see that information in context, and visualize the tax information over 250,000 parcels in the County.

More information about secured property taxes in the County can be found on the County's Treasurer-Tax Collector site.