Property tax in Slope County, North Dakota

By Brent Chudoba, editor Updated September 23, 2026

The median property tax bill in Slope County, North Dakota is $387 a year, which is about 0.23% of the county's median home value of $170,000. That effective rate is lower than the typical North Dakota county (0.92%) and lower than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.

Estimate the property tax on a home in Slope County

Enter a home's market value for a ballpark at Slope County's average effective rate of 0.23% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.

Home market value

Estimated property tax: $391 / year

Property tax in Slope County at a glance

Slope County, North Dakota property tax (Census ACS, reviewed September 23, 2026)
Measure	Value
Median annual property tax	$387
Median home value	$170,000
Effective tax rate	0.23%
Typical North Dakota county rate	0.92%
National median county rate	0.81%

Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.

How does Slope County compare in North Dakota?

Among North Dakota's 53 counties, Slope County has the 53rd highest effective property-tax rate. That places it among the least taxed counties in the state. Nationally, it ranks 3122nd of 3135 US counties by effective rate. See every North Dakota county ranked.

How much do homeowners in Slope County actually pay?

The median is only the middle bill. Across Slope County's 302 owner-occupied homes, 9.9% pay $3,000 or more a year in property tax, 19.5% pay at least $2,000, and 50% pay under $800. Another 23.5% report paying no property tax at all, which usually means an exemption covers the whole bill.

Annual property tax paid by Slope County homeowners (Census ACS 2020-2024)
Annual bill	Homes	Share
Under $800	151	50%
$800 to $1,499	16	5.3%
$1,500 to $1,999	5	1.7%
$2,000 to $2,999	29	9.6%
$3,000 or more	30	9.9%
No property tax paid	71	23.5%

Owners with a mortgage pay a median of $364 and owners without one pay $500. Here the owners without a mortgage pay more, which can happen where long-held homes sit in the higher-value parts of the county. Census table B25103.

How does the Slope County property tax bill compare with local incomes?

The median property tax bill of $387 is about 0.5% of the median income of Slope County homeowner households, $80,735 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 80.7% of Slope County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.

Have property taxes gone up in Slope County?

The survey cannot tell. The median bill was $607 in 2015-2019 and $387 in 2020-2024, but that $220 difference is inside the Census's own margin of error for a county this size, so it could be sampling noise rather than a real change.

Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.

Property tax in counties next to Slope County

Slope County borders 7 counties, 1 of them across the state line.

Slope County and its neighbors, highest effective rate first (Census ACS 2020-2024)
County	Effective rate	Median bill	Median home value
Hettinger County, ND	1.12%	$1,308	$117,300
Adams County, ND	1%	$1,130	$113,200
Golden Valley County, ND	0.89%	$1,104	$123,900
Stark County, ND	0.89%	$2,411	$271,700
Bowman County, ND	0.73%	$1,199	$164,900
Fallon County, MT	0.5%	$1,220	$244,800
Billings County, ND	0.37%	$1,211	$331,000
Slope County, ND (this county)	0.23%	$387	$170,000

How is a home assessed in Slope County?

North Dakota assesses homes at 4.5% of market value in every county, Slope County included. How North Dakota assesses and reappraises homes.

Is there a homestead exemption in Slope County?

Not as an exemption. North Dakota's Primary Residence Credit takes up to $1,600 off the tax bill; apply online with the Tax Commissioner between January 1 and April 1 each year. That is the North Dakota rule, and it applies in Slope County. North Dakota's exemptions and relief programs in full.

When are property taxes due in Slope County?

North Dakota bills once a year and lets you split it in half. The whole year's tax becomes due January 1 following the year it was levied, the first half goes delinquent after March 1 and the second after October 15, with penalties added at each missed date. If you pay the full year on or before February 15 the county treasurer takes 5% off the general real estate taxes, and that discount is calculated before the Primary Residence Credit is subtracted.

North Dakota splits the bill into 2 installments. That is the North Dakota rule. Slope County issues and collects the bill, so the dates printed on your statement are the ones that bind you.

How to appeal your Slope County property assessment

You contest the assessed value with the your local board of equalization, then the county board, then the State Board of Equalization. The filing deadline is typically April for the local board, then the first 10 days of June for the county board. That is the North Dakota rule; Slope County sets the exact dates and forms. The North Dakota appeal process step by step.

North Dakota rules from primary state sources, reviewed September 7, 2026; sources on the North Dakota page.

Work out your own numbers

Sources

Median real estate taxes paid and median home value for Slope County, North Dakota: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.