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Newton County · Diamond, MODiamond, MO property taxes. A steady market. Check the details.
The typical home in Diamond was worth about $244,000 in January 2026, up 2.3% from a year earlier. In a steady market, an appeal works best for specific homes whose assessment ran ahead of what they'd sell for.
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What Diamond home values did
Diamond values rose 2.3% in the year to January 2026, reaching a new high. That's in line with Newton County as a whole (+2.6%).
Since January, values have risen 2.4% through August 2026.
| Month | Typical value | vs. a year earlier |
|---|---|---|
| January 2021 | $172,000 | +9.6% |
| January 2022 | $191,000 | +11.5% |
| January 2023 | $211,000 | +10.3% |
| January 2024 | $225,000 | +6.8% |
| January 2025 | $239,000 | +6.0% |
| January 2026 | $244,000 | +2.3% |
| August 2026 (latest) | $250,000 | +2.4% since January |
January 2026 was the highest month since 2021.
What to check on your notice
The typical Diamond home gained 2.3% 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 an appeal.
How Diamond compares nearby
Among 7 Newton County places, Diamond has the 6th largest drop from its peak and the 3rd highest typical value. Statewide, its 1-year change ranks 296th of 644 Missouri places, from weakest to strongest.
| Place | January 2026 | 1-year change | vs. peak |
|---|---|---|---|
| Neosho | $227,000 | +3.3% | At peak |
| Seneca | $222,000 | +2.1% | At peak |
| Granby | $203,000 | -2.6% | -2.9% |
| Diamond | $244,000 | +2.3% | At peak |
| Fairview | $243,000 | -0.6% | -0.6% |
| Wentworth | $313,000 | -0.9% | -1.3% |
| Leawood | $336,000 | +3.7% | At peak |
Deadline and where to file
Diamond values are set by the local county assessor. Appeal to your county Board of Equalization before the second Monday in July. The board may extend the date. St. Louis City follows the second Monday in July. Jackson County has listed the third Monday in June as its 2026 deadline, so always check your own county.
Reading this in fall 2026? The 2026 Board of Equalization window has closed. Missouri's next general reassessment is as of January 1, 2027, so the realistic next chance is the 2027 board window: forms and notices come out in spring 2027 and the statutory deadline is before the second Monday in July 2027 (July 12, 2027), though some counties set earlier dates. If you lost at the board this year, you have until September 30 or 30 days after the board decision, whichever is later, to appeal to the State Tax Commission.
The Newton County guide covers the full Missouri appeal process: forms, fees, hearing levels and what happens next.
Building a Diamond case
A citywide index shows the trend. Your case needs your house. Diamond is part of the Joplin metro, but your evidence should be local. Sales a few streets away usually beat sales across the metro.
- In St. Louis City, bring six copies of anything the board should review.
Get your Diamond appeal report
Start with your address. Vulorean checks your assessment against recent comparable sales and builds a value report you can bring to your Missouri appeal. 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. Missouri 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: RSMo 137.385, Appeal to county board of equalization, RSMo 137.115, Reassessment cycle and residential ratio, RSMo 138.430, Appeal to State Tax Commission, Missouri State Tax Commission, file an appeal. Vulorean is an independent service, not a government office. Confirm dates and forms with your local office.