Slope County, ND Property Tax: $460/yr (2026)
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The effective property tax rate in Slope County is 0.38% of assessed home value. On a home at the county median value of $121,300, that works out to about $461 per year, or $38 per month. Slope County is located in southwestern North Dakota, with Amidon as its county seat, and is home to approximately 795 residents.
About Slope County
Slope County covers approximately 1,215.3 square miles in North Dakota. The county is home to about 795 residents living in roughly 458 housing units, of which 64.8% are owner-occupied. The median household income is $62,500, and the median home was built in 1954.
The county seat is Amidon. Slope County borders Fallon County, Adams County, Billings County, Bowman County, Golden Valley County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in North Dakota
Property taxes in North Dakota are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in North Dakota offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the Slope County Assessor's office to learn which exemptions apply to your property and when to file.
Slope County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Slope County, ND | 0.38% | $121,300 | $461 |
| North Dakota state average | 0.89% | — | $1,080* |
| Fallon County | 0.57% | $237,000 | $1,359 |
| Adams County | 1.02% | $108,300 | $1,106 |
| Billings County | 0.37% | $322,500 | $1,189 |
| Bowman County | 0.75% | $176,400 | $1,330 |
| Golden Valley County | 0.93% | $119,200 | $1,109 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Slope County's median home value of $121,300. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Slope County's property tax rate compare to the rest of North Dakota?
At 0.38%, Slope County is lower than the North Dakota state average of 0.89%. On a home at the county median of $121,300, that means about $461 per year — versus $1,080 at the state average rate, a difference of $619 per year. Compared to the national average of 1.10%, Slope County is below average.
What's a typical annual property tax bill in Slope County?
For a home at the county median value of $121,300, the annual property tax in Slope County is approximately $461 — or about $38 per month. For a home worth $181,950, expect around $691 per year. For a $242,600 home, approximately $922 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Slope County property tax assessment?
Property assessment appeals in Slope County are handled by the Slope County Assessor's office in Amidon. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in Slope County?
North Dakota counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 0.38% shown here. Contact the Slope County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File