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Port Isabel, Cameron County, Texas Property Taxes

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Property Taxes in Port Isabel, Texas

  • Median Port Isabel, Texas effective property tax rate: 1.57%, significantly higher than the national median of 1.02%, and higher than the Texas state median of 1.48%.

  • Median Port Isabel, Texas home value: $175,914

  • Median annual Port Isabel, Texas tax bill: $2,193, $207 lower than the national median property tax bill of $2,400.

How are property taxes in Cameron calculated?

Property taxes in Port Isabel, Texas 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 Port Isabel's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Port Isabel, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Port Isabel, Cameron County, Texas Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.57%

Estimate Property Tax Bill

$2,762

$2,563

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Port Isabel Property Tax Calculator Work?

Use this Port Isabel property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Port Isabel's median effective tax rate of 1.57% — based on actual property records in Cameron County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Port Isabel's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Port Isabel: rates range from 1.57% in 78578 to 1.57% in 78578, primarily due to differences in school district levies and local assessment districts.

If your estimate is higher than expected, Ownwell can appeal your Port Isabel assessment — you only pay if we save you money.

About Port Isabel Property Taxes

About Property Taxes in Port Isabel, Cameron, Texas

Port Isabel’s median effective property tax rate of 1.57% is higher than the Texas state median of 1.48% and higher than the national median of 1.02%. This rate reflects the Cameron County base levy combined with local school district levies and Municipal Utility Districts that vary by subdivision throughout the city.

Property tax rates are not uniform across Port Isabel. Homeowners in ZIP code 78578 carry a median effective rate of 1.57%, while those in the same ZIP code also pay 1.57%. This spread reflects how school district boundaries and local assessment districts are drawn across Cameron County. Understanding which part of Port Isabel you live in can make a meaningful difference to your annual tax bill.

Port Isabel homeowners who believe their assessed value is too high can file a formal appeal with the local Appraisal District before May 15, 2026.

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 Port Isabel, Cameron County, Texas

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 Port Isabel's effective property tax rate to other cities in Texas and the median property tax rates in Texas and the U.S.

Property Tax Rates Across Port Isabel, Cameron County, Texas

Source: Ownwell

0.27%

1.31%

2.36%

Our median effective property tax rate (tax bill ÷ 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 Port Isabel Tax Rate

1.57%

Our median effective property tax rate (tax bill ÷ 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 Cameron County Tax Rate

1.33%

Median Effective Texas Tax Rate

1.48%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Port Isabel, Cameron County, Texas

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
785780.52%0.95%1.57%2.17%2.21%

Source: Ownwell

Property Tax Assessment Values Across Port Isabel, Cameron County, Texas

When examining property taxes in Port Isabel, Texas, 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 Cameron County appraisal district 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 Cameron County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of April.

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. For Port Isabel, the median home price is $175,914, with a median tax bill of $2,193. Tax bills range from $839 at the 25th percentile to $6,431 at the 90th percentile, and ZIP code 78578 has the highest median home price at $175,914.

Property Tax Assessment Values Across Port Isabel, Cameron County, Texas

Source: Ownwell

$13,508

$221,167

$428,825

Median Port Isabel Market Value

$175,914

Median Cameron County Market Value

$155,094

Median Texas Market Value

$258,851

Median United States Market Value

$235,294

Property Tax Assessment Values Across Port Isabel, Cameron County, Texas

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
78578$11,389$79,600$175,914$309,996$429,637

Source: Ownwell

Property Tax Bills Across Port Isabel, Cameron County, Texas

Property tax bills in Port Isabel are based on the assessed value of a home and the local tax rate set by taxing authorities in Cameron County. When a property’s market value rises, the assessed value can rise too, which can increase the tax bill. For homeowners, that means the amount owed can vary widely from year to year, even if nothing changes about the home itself.

In Port Isabel, the median home price is $175,914, and the median tax bill is $2,193, which is below the national median property tax bill of $2,400. Still, bills can range much higher, with the 75th percentile at $4,234 and the 90th percentile at $6,431.

Ownwell helps homeowners lower property tax bills by reviewing assessed values, identifying savings opportunities, and filing appeals when a property is overassessed. That can make a meaningful difference for homeowners looking to reduce their annual tax burden.

Property Tax Bills Across Port Isabel, Cameron County, Texas

Source: Ownwell

$219

$3,444

$6,669

Median Port Isabel Tax Bill

$2,193

Median Cameron County Tax Bill

$1,458

Median Texas Tax Bill

$3,441

Median United States Tax Bill

$2,400

Property Tax Bills Across Port Isabel, Cameron County, Texas

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
78578$187$839$2,193$4,234$6,431

Source: Ownwell

Don't miss the deadline to protest!

Frequently Asked Property Tax Questions in Port Isabel, Texas

How are property taxes calculated in Port Isabel, Texas?
Property taxes in Port Isabel, Texas are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.
How do I appeal my property taxes in Port Isabel, Texas?
To appeal your property taxes in Port Isabel, Texas, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.
What property tax exemptions are available in Port Isabel, Texas?
Common property tax exemptions in Port Isabel, Texas include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.
When are property taxes due in Port Isabel, Texas?
Property tax deadlines in Port Isabel, Texas vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.
How can Ownwell help reduce my property taxes in Port Isabel, Texas?
Ownwell provides professional property tax appeal services in Port Isabel, Texas. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.