PORT ISABEL Sales Tax Overview
As of 2026, PORT ISABEL, Texas has a combined sales tax rate of 8.25%. This rate includes the Texas state tax of 6.25% plus applicable county and local taxes.
This rate applies to most taxable goods and services purchased within the 78578 zip code area. Some items such as groceries, prescription drugs, and clothing may be exempt depending on Texas state law.
PORT ISABEL Tax Examples
* Based on rate of 8.25%. Verify with your exact zip code.
PORT ISABEL Zip Codes & Tax Rates
| Zip Code | Combined |
|---|---|
| 78578 | 8.25% |
Frequently Asked Questions
What is the sales tax rate in PORT ISABEL, TX?
The sales tax rate in PORT ISABEL, TX is 8.25% as of 2026. This includes the 6.25% Texas state tax plus any county and city taxes.
How many zip codes are in PORT ISABEL, TX?
PORT ISABEL, TX has 1 zip code in our database: 78578.
How much is sales tax on a $100 purchase in PORT ISABEL?
On a $100 purchase in PORT ISABEL, TX you would pay approximately $8.25 in sales tax at the average rate of 8.25%, for a total of $108.25.
Is PORT ISABEL's sales tax rate higher than the Texas average?
Use our calculator to compare PORT ISABEL's rate of 8.25% against other cities in Texas. Visit the Texas state page for the statewide average.