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Assessor: Jefferson County housing market still rising; office presents ratio study and 2025 assessment changes
Summary
Jefferson County Assessor's Office presented a countywide assessment update showing continued population growth, a shift toward residential (bedroom-community) sales, increases in some commercial and manufactured-home assessments and a median ratio below 100% that the state monitors for compliance.
Jefferson County Assessor’s Office staff presented statistics on population, recent sales and the 2025 mass-appraisal ratio study, telling commissioners the county remains a growing bedroom community and that assessors adjusted several property categories to improve compliance with state ratio requirements.
Jessica Roach and staff described a roughly 10-year population increase of nearly 13% and an estimated county population “getting close to about 36,000.” The office reported more than 2,000 sales in 2024 for which it had partial data and said residential property accounts for roughly 78.8% of the county’s tax burden.
The assessor’s staff explained that Idaho requires mass appraisal at market value each Jan. 1 and that the state tax commission’s ratio study compares assessed values to documented sales. The county’s median ratio for 2024 sales was cited around 93.6, inside the statutory 90–110% compliance band but below the 100% market-value target; staff said the legislature and tax commission are moving toward narrowing acceptable ranges.
Why it matters: The assessment adjustments affect future tax notices and homeowner expectations. Staff said manufactured-home values were increased based on sales data, commercial values rose where more sales data were available, and larger non-farm acreage (2–20 acres) required increases to avoid low-end valuation bias.
Questions: Commissioners asked about homeowner exemptions and how budget-driven levies interact with market-driven assessed values; staff reiterated the distinction between assessed value (market) and taxes (budget-driven) and noted legislative property-tax relief programs are administered via the school funding process.
Ending: Assessor staff said they will continue outreach and publish educational materials; commissioners thanked staff for the update and suggested preparing public-facing explanations about assessments and taxes.
