Which Counties Pay the Highest Property Tax Rates?

Why property tax rates vary so much by county

Property taxes are local. That means two homeowners in different counties can own homes with similar values but pay very different tax bills.

Your bill is usually driven by a combination of assessed value, local tax rates, school taxes, municipal taxes, special assessments, exemptions, and county appeal rules. In high-tax counties, even a small over-assessment can cost a homeowner hundreds or thousands of dollars over time.

That is why homeowners should not only ask, “What is my home worth?” They should also ask, “Is my home being assessed fairly compared to similar properties?”

Highest effective property tax rates by county

The counties below are listed from highest to lowest based on reported effective property tax rates for large U.S. counties. Effective tax rate means the average annual property tax expressed as a percentage of estimated home value.

Source note: Ranking is based on reported effective property tax rates for large counties. Effective tax rate compares annual property tax to estimated market value. Local tax bills vary by municipality, school district, exemptions, assessment practices, and property-specific facts.

What the rankings tell homeowners

High property tax rates do not automatically mean your assessment is wrong. But they do mean mistakes are more expensive.

In a high-tax county, an over-assessment can compound quickly. If your home is assessed above its actual market value, or if your property record includes incorrect information, you may be paying more than your fair share.

That is why homeowners in high-tax counties should review their assessment every year, especially when values shift, nearby homes sell for less, or the property has condition issues that the assessor may not fully account for.

Common reasons homeowners overpay

Many homeowners assume their property tax bill is fixed, but assessments can be challenged when the evidence supports a lower value.

Common issues include:

• The assessed value is higher than recent comparable sales.
• The county has incorrect square footage, bedroom count, bathroom count, or property details.
• The assessment does not reflect outdated interiors, needed repairs, drainage issues, noise, traffic, or other negative value factors.
• Nearby homes with similar features are assessed for less.
• Available exemptions were missed or not properly applied.
• The property was compared to homes that are larger, newer, renovated, or in better condition.

Why Illinois, New York, and Pennsylvania appear often

Many of the highest-rate counties are concentrated in the Northeast and Midwest. These areas often rely heavily on property taxes to fund schools, local services, infrastructure, and municipal budgets.

For homeowners, the takeaway is simple: if your county has a high effective tax rate, it becomes even more important to make sure your assessed value is accurate.

A lower assessment can reduce your tax burden this year and may help reset your tax baseline going forward, depending on local rules.

How to review your county property tax assessment

Start with your property record. Check whether the assessor has the correct square footage, lot size, year built, bedrooms, bathrooms, basement status, and other property details.

Next, compare your assessed value to recent nearby sales. The best comparable sales are usually similar homes in similar condition that sold near the assessment valuation date.

You should also check whether you qualify for homestead, senior, veteran, disability, or local exemptions. Missing exemptions can be just as costly as an inflated assessment.

If you live in a high-tax county, reviewing your assessment every year is a smart habit. There is no reason to overpay because of a value that is too high, a property record that is wrong, or an exemption that was overlooked.