Colorado average property tax mill levies by county

What the figures are

This page reproduces the Division of Property Taxation's average mill levies for each county for 2025: the total average levy (all property tax revenue in the county divided by its assessed valuation) and averages for county, municipal, school and special district levies. These are averages over the whole county, not the levy on any one bill. Period: 2025 assessed valuation and the levies certified on it for collection in 2026, from the Division of Property Taxation's 2025 annual report.

Mill levy. Mills are dollars per $1,000 of assessed value; the report's total average levy equals total revenue ÷ assessed valuation × 1,000 on every row (checked). (2025 Annual Report, pp. 1041-1042)

Parts and total. The report's footnote: "Average will not add to the Total Average County Levy because denominators (Assessed Valuation) are not common to all." Municipal and special district averages are divided by the valuation of municipalities and special districts only. (2025 Annual Report, footnotes (1)-(3))

• Colorado assessed value is a percentage of actual value that the legislature has changed in recent years, so a mill levy is not a share of market value, and no example bill is given.
• The 64 counties' valuations add up exactly to the printed Total, but their revenues add up to $16,634,794,287, $369,002,062 less than the printed Total revenue of $17,003,796,349; the report does not say what the difference is (it is within $1 of Broomfield's printed revenue, $369,002,061), so the statewide row is shown as printed. The parts do not add to the total, as the report says. 2 counties print no municipal average (Broomfield, Denver: city and county governments). 30 counties are marked in the report as including tax increment valuation and revenue.

All 64 counties, 2025

Ranked by total average county levy (mills on assessed value), highest first; 1 county shown as printed but not ranked (†) follow. Click a heading to sort.

Rows shown as printed but checked

Every row is shown exactly as the source prints it. This one failed one of this page's checks, so it is marked † and left out of rankings, medians and the drawings; it was not changed.

• Broomfield: Outside three interquartile ranges of the other counties (above 150.7 or below -4.4 mills). Its levy follows from the printed revenue and valuation (checked), so it is shown as printed.

Colorado's assessment rate was not read from an official source for this page, so no example bill is computed.

How to appeal an assessment in Colorado

1. File a protest with the county assessor: required first; the Judicial Branch page gives no date (the assessor's notice of valuation does). (source)
2. Appeal to the county board of equalization and receive its decision: required before any further appeal. (source)
3. Appeal to the Board of Assessment Appeals, to district court in the county, or to arbitration (the arbitrator's decision is final): no later than 30 days after the date the county board of equalization's decision was mailed (§§ 39-8-106 to 39-8-108, C.R.S.). (source)

From the Colorado Judicial Branch's self-help page on property tax appeals. Sources: Colorado Judicial Branch, Self-Help: Property Tax Appeal, read October 27, 2026. The official notice and the body hearing the appeal govern the dates; this is not legal advice.

Questions

Other states

Town-by-town rates: New Hampshire, Connecticut, Rhode Island, New Jersey, Maine and Massachusetts. County or district figures, by census region: Northeast: New York, Vermont; Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin; South: Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, Tennessee, Texas, Virginia, West Virginia; West: Alaska, Arizona, California, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming. The states page compares them; the assessed-versus-market-value guide explains why a rate alone does not fix a bill.

Source: Colorado Division of Property Taxation, 2025 Fifty-Fifth Annual Report to the Governor and the General Assembly, Total Revenue and Average Mill Levy by County (2025 assessed valuation, total revenue and the average county, municipal, school, special district and total county levy in mills for the 64 counties and the state total (printed pp. 1041-1042); read twice, both reads identical). Checks: the table was read twice, independently, and both reads agreed on all 65 rows; total revenue ÷ assessed valuation × 1,000 reproduces the printed total average levy on every row; the 64 counties' valuations add up to the printed Total; their revenues fall short of the printed Total revenue by the amount stated on this page; rows outside three interquartile ranges of the other counties are flagged; no two neighbouring rows repeat the same figures. Last checked October 27, 2026. See the methodology. Figures are reproduced from the official publication; the county, town or state office that issues the bill governs. Not tax or legal advice.