 Property tax rates in 2014-2015 were set by the Cocalico School Board at 22.3200 mills for Lancaster County residents and 12.8500 mills for residents in Berks County.A mill is $1 of tax for every $1,000 of a property's assessed value.Irregular property reassessments have become a serious issue in the commonwealth as it creates a significant disparity in taxation within a community and across a region.