Mill levies are set by the taxing authorities (City and County of Broomfield, North Metro Fire Dept., school districts, metro districts, etc.) in which your property is located. Areas where these tax authorities overlap are put into Tax Areas in the assessor's database. Every property in a tax area is taxed by that area's total net mill levy. The property tax revenues support services in your specific area. The assessor reports the total assessed value to the tax authorities every year and the tax authorities determine their budget and send their mill levy certification to the County no later than December 15.
Mill levies are finalized at the end of December each year and posted early January. Mill Levies by Tax Area/District Report