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Darke County · Union City, OHUnion City, OH property taxes. Values held. Know when to push back.
The typical home in Union City was worth about $150,000 in January 2026, up 4.6% from a year earlier. In a steady market, a complaint works best for specific homes whose assessment ran ahead of what they'd sell for.
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What Union City home values did
Union City values rose 4.6% in the year to January 2026, reaching a new high. That's weaker than Darke County as a whole (+6.9%).
Since January, values have risen 5.9% through August 2026.
| Month | Typical value | vs. a year earlier |
|---|---|---|
| January 2021 | $98,000 | +21.0% |
| January 2022 | $110,000 | +12.1% |
| January 2023 | $121,000 | +10.0% |
| January 2024 | $131,000 | +8.1% |
| January 2025 | $143,000 | +9.1% |
| January 2026 | $150,000 | +4.6% |
| August 2026 (latest) | $159,000 | +5.9% since January |
January 2026 was the highest month since 2021.
What to check on your notice
The typical Union City home gained 4.6% in the year to January 2026. A notice that rose far more than that, or a value above what similar homes nearby actually sold for, is the usual starting point for a complaint.
How Union City compares nearby
Among 10 Darke County places, Union City has the 5th largest drop from its peak and the 9th highest typical value. Statewide, its 1-year change ranks 600th of 935 Ohio places, from weakest to strongest.
| Place | January 2026 | 1-year change | vs. peak |
|---|---|---|---|
| Greenville | $199,000 | +6.6% | At peak |
| Arcanum | $241,000 | +7.7% | At peak |
| Versailles | $297,000 | +6.3% | At peak |
| Bradford | $212,000 | +4.9% | At peak |
| Union City | $150,000 | +4.6% | At peak |
| New Madison | $208,000 | +8.2% | At peak |
| Ansonia | $177,000 | +8.3% | At peak |
| Yorkshire | $339,000 | +9.8% | At peak |
| North Star | $237,000 | +6.7% | At peak |
| Hollansburg | $112,000 | +5.2% | At peak |
Deadline and where to file
Union City values are set by the local county auditor. File a complaint with the county auditor on or before March 31 of the year after the tax year, or the date collection of first-half taxes closes, whichever is later. Complaints can be filed starting January 1. By mail, the postmark counts as the filing date.
Reading this in fall 2026? The window for tax year 2025 closed March 31, 2026. The next window opens January 1, 2027 and closes March 31, 2027 (or the close of first-half collection, whichever is later) for tax year 2026. Gather your evidence over the winter and file early in 2027.
The Darke County guide covers the full Ohio complaint process: forms, fees, hearing levels and what happens next.
Building a Union City case
Averages explain why a case might work. The decision turns on evidence about one property. Union City is part of the Greenville metro, but your evidence should be local. Sales a few streets away usually beat sales across the metro.
- Use a recent arm's length sale of your home, an appraisal, or sales of comparable homes. The complainant must give the board all information within their knowledge that affects the property.
Get your Union City appeal report
Start with your address. Vulorean checks your assessment against recent comparable sales and builds a value report you can bring to your Ohio complaint. Eligible reports are free during launch; an account is required and local filing fees are separate.
Check my property and get a report →Vulorean was built for California first. Ohio forms, deadlines and filing rules vary, so confirm them with your local office before filing. If something in your report looks wrong, email support@vulorean.com and we'll get it fixed.
Home values: Zillow Home Value Index (ZHVI), all homes, mid-tier, smoothed and seasonally adjusted, through August 2026, from Zillow Research. Rules: Ohio Revised Code 5715.19 (complaint filing, effective March 20, 2026), Ohio Revised Code 5717.01 (appeal to Board of Tax Appeals, 30 days), Ohio Department of Taxation: DTE Form 1, Ohio Department of Taxation: Reappraisal and update schedule. Vulorean is an independent service, not a government office. Confirm dates and forms with your local office.