Mill Levies & Taxing Districts

Mill Levies & Taxing Districts

Local Government Budget Process

Each year county commissioners, city councils, school boards, and special districts hold budget hearings to determine how many dollars will be needed for the following year’s operations. These hearings are usually held in September or October but may be held earlier. Check your local newspaper for the hearing dates. (See Budget & Finance for more information.)

Each taxing entity determines what revenues will be required to operate the entity during the coming fiscal year. The required revenues are then divided by the total assessed value to determine the tax rate/mill levy per entity.

Generally, properties are affected by several taxing entities. To determine the Tax Area for a specific property, please refer to the Assessment tab on Boulder County’s Property Search application.

Assessment Abstracts

Annual report showing the total assessed valuation for Boulder County

Certification of Values to Taxing Entities

Each year, taxing entities are required to develop a budget for the upcoming year.

Mill Levy Changes

Detailed lists of changes in mill levies from year to year.

Property Tax Bills

For exact property taxes due, please refer to the Boulder County Treasurer’s website or contact the Boulder County Treasurer at (303) 441-3520.

Contact Us

Phone: 303-441-3530 option 1
Fax: 303-441-4996

Business Personal Property
Phone: 303-441-3530 option 2
Fax: 303-441-1783


Schedule a meeting

Mailing Address
Main: PO Box 471
Boulder, CO 80306-0471


Assessor Boulder & Longmont Drop Boxes

1325 Pearl St., 2nd floor
Boulder, CO 80302
Map & Directions
Hours: 7:30 a.m.–5 p.m. M–Th

515 Coffman Street, Suite 114
Map & Directions

1376 Miners Dr., Unit 105
Map & Directions
Please note: the Lafayette office will be closed until October 26.