Johnston, Polk County, Iowa Property Taxes
Property Taxes in Johnston, Iowa
Median Johnston, Iowa effective property tax rate: 1.63%, significantly higher than the national median of 1.02%, and higher than the Iowa state median of 1.55%.
Median Johnston, Iowa home value: $343,900
Median annual Johnston, Iowa tax bill: $5,648, $3,248 higher than the national median property tax bill of $2,400.
How are property taxes in Polk calculated?
Property taxes in Johnston, Iowa are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding Johnston's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Johnston, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Johnston, Polk County, Iowa Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
1.63%
Estimate Property Tax Bill
$5,606
$5,202
How Does the Johnston Property Tax Calculator Work?
Use this Johnston property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Johnston's median effective tax rate of 1.63% — based on actual property records in Polk County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment process uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Johnston's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Johnston's median effective tax rate is higher than Iowa's 1.55% state median tax rate, and the median property tax bill is $5,648, which is $3,248 higher than the state median. Rates are the same across ZIP code 50131, so your estimate should be consistent within the city.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Johnston.
About Johnston Property Taxes
About Property Taxes in Johnston, Polk, Iowa
Johnston’s median effective property tax rate of 1.63% is higher than the Iowa state median of 1.55% and higher than the national median of 1.02%. This rate reflects the Polk County base levy combined with local school district levies and special assessment districts that vary by subdivision throughout the city.
Property tax rates are not uniform across Johnston. Homeowners in ZIP code 50131 carry a median effective rate of 1.63%, while those in the same ZIP code also pay 1.63%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Polk County. Understanding which part of Johnston you live in can make a meaningful difference to your annual tax bill.
Johnston homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the April 30, 2026 deadline each year.
If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across Johnston, Polk County, Iowa
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.
While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.
Below, you can compare Johnston's effective property tax rate to other cities in Iowa and the median property tax rates in Iowa and the U.S.
Our median effective property tax rate (tax bill Ă· assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Johnston Tax Rate
1.63%
Our median effective property tax rate (tax bill Ă· assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Polk County Tax Rate
1.71%
Median Effective Iowa Tax Rate
1.55%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Johnston, Polk County, Iowa
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 50131 | 1.54% | 1.59% | 1.63% | 1.65% | 1.68% |
Source: Ownwell
Property Tax Assessment Values Across Johnston, Polk County, Iowa
When examining property taxes in Johnston, Iowa, understanding the distinction between market value and assessed value is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Polk County assessment office estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices:
In Polk County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of March.
Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Johnston.
For example, the median home price in Johnston is $343,900, with tax bills ranging significantly across the county. 50131 has the highest median home price at $343,900.
Property Tax Assessment Values Across Johnston, Polk County, Iowa
Source: Ownwell
$2,050
$223,775
$445,500
Median Johnston Market Value
$343,900
Median Polk County Market Value
$232,800
Median Iowa Market Value
$169,700
Median United States Market Value
$235,294
Property Tax Assessment Values Across Johnston, Polk County, Iowa
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 50131 | $182,200 | $249,300 | $343,900 | $447,500 | $599,900 |
Source: Ownwell
Property Tax Bills Across Johnston, Polk County, Iowa
Property tax bills in Johnston are based on the assessed value of a home and the local tax rate set by taxing authorities. When a property is reassessed, its market value is compared with similar homes, and that assessed value becomes the starting point for the bill. Local budgets for schools, city services, and other public needs also affect the final amount homeowners owe.
With a median home price of $343,900, Johnston homeowners often face bills that are well above the national median property tax bill of $2,400. The 25th percentile bill is $4,146, while the 75th percentile is $7,434 and the 90th percentile reaches $9,889. The median tax bill in ZIP code 50131 is $5,648.
Because property taxes are tied to both home value and local rates, even small changes in assessed value can raise or lower a homeowner’s bill. That makes understanding the calculation important for budgeting and for spotting when a bill may be higher than it should be.
Median Johnston Tax Bill
$5,648
Median Polk County Tax Bill
$3,950
Median Iowa Tax Bill
$2,542
Median United States Tax Bill
$2,400
Property Tax Bills Across Johnston, Polk County, Iowa
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 50131 | $3,198 | $4,146 | $5,648 | $7,434 | $9,889 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | April 30 |
Links | |
|---|---|
| Polk Tax Assessor | |
| Website | www.assess.co.polk.ia.us |