Did your home's assessment go up?
Each year the county sets a new assessed value on your home, and it drives next year's tax bill. This tracks how those values changed from 2024 to 2025 across Zionsville: the typical increase, the full spread, and how any address compares. Recorded assessor values, not estimates.
Look up your home
Half of Zionsville homes changed by more than that, half by less; the middle 50% landed between +4.0% and +6.8%. The median home is now assessed at $563,400. Pick an address to see its own change and where it lands in the spread below.
Zionsville assessments, 2024 to 2025
Each bar is the number of homes whose assessed value changed by that much; the dashed line is the town median (+5.3%). Increases are the norm because assessments track a rising market, which doesn't mean your taxes rise one-for-one (the caps and deductions below blunt that).
By neighborhood
Median assessed-value change per neighborhood, highest first. Neighborhoods with at least 5 homes assessed both years. A bigger jump usually reflects strong recent sales nearby, which lift assessed values across the area.
Why it went up
Indiana adjusts assessments every year to track the market, using recent sale prices in your area (a “trending” factor), on top of the state's four-year reassessment cycle. So a run of strong sales nearby lifts your assessed value even if nothing about your house changed. The assessment date is January 1; the county mails a Form 11 notice when your value changes.
A higher assessment isn't a matching tax hike
Your bill isn't the assessed value times a rate. Homestead deductions come off first, and the 1% cap (2% for a rental or second home) limits the result. A referendum levy rides on top of the cap. So a 5% assessment bump rarely means a 5% bigger bill. Estimate your actual bill →
If you think it's wrong
You can appeal, in writing, to the county assessor (Form 130). The window generally closes June 15, but the exact deadline depends on when your Form 11 notice was mailed, so confirm it with the Boone County Assessor. An appeal argues the assessed value is above market value; recent sales of comparable homes are the usual evidence.
Assessed value vs. sale price
Indiana assesses near market value, so the assessed figure is a fair reference for what a home is worth, but it isn't an appraisal and it lags actual sales by a year or two. For what homes truly changed hands for, see what sold recently and the price map.
How this is built, and what it isn't
Values come from the Boone County assessor's parcel file (Indiana's 50 IAC 26 record), which carries each home's current and prior-year assessed value. We compare the 2025 assessment (the basis for 2026 tax bills) with 2024, using gross assessed value before any deductions. The town figures count only homes standing in both years (11,266 residential parcels): new construction, teardown rebuilds, and lot-to-home jumps are left out, since their change is a new building, not a reassessment. The file refreshes once a year, so these are the latest values on record, not a live figure. This is a reference, not an appraisal, a determination, or a tax bill. Confirm any specific value with the Boone County Assessor.