Property tax in Dubuque County, Iowa

By Brent Chudoba, editor Updated September 23, 2026

The median property tax bill in Dubuque County, Iowa is $2,919 a year, which is about 1.23% of the county's median home value of $237,300. That effective rate is lower than the typical Iowa county (1.32%) and higher 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 Dubuque County

Enter a home's market value for a ballpark at Dubuque County's average effective rate of 1.23% (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: $2,919 / year

Property tax in Dubuque County at a glance

Dubuque County, Iowa property tax (Census ACS, reviewed September 23, 2026)
Measure	Value
Median annual property tax	$2,919
Median home value	$237,300
Effective tax rate	1.23%
Typical Iowa county rate	1.32%
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 Dubuque County compare in Iowa?

Among Iowa's 99 counties, Dubuque County has the 68th highest effective property-tax rate: 67 rank higher and 31 rank lower. That is on the lower side for Iowa. Nationally, it ranks 690th of 3135 US counties by effective rate. See every Iowa county ranked.

How much do homeowners in Dubuque County actually pay?

The median is only the middle bill. Across Dubuque County's 30,062 owner-occupied homes, 47.1% pay $3,000 or more a year in property tax, 72.7% pay at least $2,000, and 6.3% pay under $800. Another 1.7% report paying no property tax at all, which usually means an exemption covers the whole bill.

Annual property tax paid by Dubuque County homeowners (Census ACS 2020-2024)
Annual bill	Homes	Share
Under $800	1,888	6.3%
$800 to $1,499	3,128	10.4%
$1,500 to $1,999	2,675	8.9%
$2,000 to $2,999	7,709	25.6%
$3,000 or more	14,148	47.1%
No property tax paid	514	1.7%

Owners with a mortgage pay a median of $2,858 and owners without one pay $3,068. That is within 10% either way, so in Dubuque County paying off the house does not go with a noticeably different bill. Census table B25103.

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

The median property tax bill of $2,919 is about 3% of the median income of Dubuque County homeowner households, $96,738 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 73.3% of Dubuque 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 Dubuque County?

Yes. The median bill went from $2,511 in 2015-2019 to $2,919 in 2020-2024, a 16.2% rise. Over the same span the median home value moved 42.3%, from $166,800 to $237,300. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.

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 Dubuque County

Dubuque County borders 6 counties, 2 of them across the state line.

Dubuque County and its neighbors, highest effective rate first (Census ACS 2020-2024)
County	Effective rate	Median bill	Median home value
Jo Daviess County, IL	1.72%	$3,613	$209,900
Grant County, WI	1.36%	$2,729	$200,700
Delaware County, IA	1.34%	$2,382	$177,900
Jones County, IA	1.33%	$2,450	$184,800
Clayton County, IA	1.29%	$2,181	$168,500
Jackson County, IA	1.23%	$2,159	$175,000
Dubuque County, IA (this county)	1.23%	$2,919	$237,300

How is a home assessed in Dubuque County?

Iowa sets the assessment rules and Dubuque County applies them. How Iowa assesses and reappraises homes.

Is there a homestead exemption in Dubuque County?

Yes. From the 2026 assessment year Iowa exempts 10% of a homestead's taxable value, never less than $5,500 or more than $20,000. File form 54-028 with your assessor by July 1. That is the Iowa rule, and it applies in Dubuque County. Iowa's exemptions and relief programs in full.

When are property taxes due in Dubuque County?

Iowa bills for a fiscal year running July 1 to June 30 and you pay the county treasurer in two halves, the first by September 30 and the second by March 31. The statute technically says pay before September 1 and March 1, but nothing goes delinquent and no interest accrues until October 1 and April 1, which is why counties advertise the end of September and March as the real deadlines. If the last day lands on a weekend you have until the second business day of the following month.

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

How to appeal your Dubuque County property assessment

You contest the assessed value with the your local board of review, then the Property Assessment Appeal Board or district court. The filing deadline is typically April 30, with protests accepted from April 2 onward. That is the Iowa rule; Dubuque County sets the exact dates and forms. The Iowa appeal process step by step.

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

Work out your own numbers

Sources

Median real estate taxes paid and median home value for Dubuque County, Iowa: 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.