Every taxing unit on a Port Isabel bill
Your bill adds up one line per taxing unit. These are the units on the 2025 appraisal roll for homes inside Port Isabel city limits, with Point Isabel ISD as the school district. Rates are dollars per $100 of taxable value.
| Taxing unit | M&O 2025 | I&S 2025 | 2025 rateadopted | 2026 rateadopted, where confirmed | Sources |
|---|---|---|---|---|---|
| Cameron CountyCounty | 0.387046 | 0.037347 | 0.424393 | 0.424393 | Cameron CAD 2025 rates, Cameron CAD 2025 roll, Cameron CAD 2026 adopted rates |
| South Texas ISD (magnet district)School district (countywide) | 0.049200 | 0.000000 | 0.049200 | 0.049200 | Cameron CAD 2025 rates, Cameron CAD 2026 adopted rates |
| City of Port IsabelCity | 0.470000 | 0.320416 | 0.790416 | 0.780000 | Cameron CAD 2025 rates, Comptroller 2025 city file, Cameron CAD 2025 roll, Cameron CAD 2026 adopted rates |
| Texas Southmost College DistrictCollege district | 0.091344 | 0.020465 | 0.111809 | 0.099734 | Cameron CAD 2025 rates, Comptroller 2025 special district file, Cameron CAD 2025 roll, Cameron CAD 2026 adopted rates |
| Laguna Madre Water DistrictWater district | 0.000000 | 0.122714 | 0.122714 | 0.122090 | Cameron CAD 2025 rates, Comptroller 2025 special district file, Cameron CAD 2025 roll, Cameron CAD 2026 adopted rates |
| Point Isabel ISDSchool district | 0.679800 | 0.050500 | 0.730300 | 0.708300 | Cameron CAD 2025 rates, Comptroller 2025 school file, Cameron CAD 2025 roll, Cameron CAD 2026 adopted rates |
| Combined (Point Isabel ISD) | 2.228832 | 2.183717 |
The Comptroller's 2025 county file adds a Cameron County road and bridge rate of 0.049765; Cameron CAD's adopted-rate sheets and every sampled 2025 roll record show 0.424393 only, which is used here.
What makes up the Port Isabel rate
Point Isabel ISD is the biggest line on a Port Isabel bill: 0.7083 of the 2.1837 per $100, or 32% of the 2026 total. The countywide units (Cameron County and South Texas ISD (magnet district)) add 0.4736.
The City of Port Isabel's own 2026 rate is 0.7800, the highest of the 6 Cameron County city rates on this site (from 0.262159 to 0.7800).
Units that tax this part of the county: Texas Southmost College District (0.099734): Brownsville, Los Fresnos and Point Isabel ISD areas (all sampled Brownsville, Los Fresnos, Port Isabel and SPI homes); Laguna Madre Water District (0.12209): Port Isabel, South Padre Island, Laguna Vista (all sampled).
From 2025 to 2026 the combined rate went from 2.2288 to 2.1837 (−0.0451). Changes by unit: Point Isabel ISD 0.7303 to 0.7083; Texas Southmost College District 0.111809 to 0.099734; City of Port Isabel 0.790416 to 0.7800; Laguna Madre Water District 0.122714 to 0.12209.
At 2025 rates (the latest year with every city's rate), Port Isabel's combined 2.2288 is the 6th lowest of the 20 Valley cities on this site and the 5th lowest of the 6 in Cameron County.
Which school district?
The 2020 Census places all of the homes inside Port Isabel city limits in Point Isabel ISD, so the table above uses it. Your district depends on your exact address. Look it up on the Cameron Appraisal District property search. The share comes from 2020 Census housing counts within current boundaries, and new streets at the edges can differ.
The 2020 Census counted 2,352 housing units inside Port Isabel city limits.
Units that tax only some homes
No other taxing units showed up on the 14 sampled homes inside Port Isabel city limits on the 2025 roll. A public improvement district (PID) in a newer subdivision bills an assessment, not a tax rate; the title company can tell you if a lot has one.
A Port Isabel mailing address can sit outside city limits, where there is no city tax and an emergency services district may tax instead. Your appraisal district record lists every unit on your home.
Estimate your Port Isabel property tax
Annual tax only. Pick your school district, enter the appraised value from your notice, and choose your exemptions.
The percentage is each district's share of the city's homes (2020 Census). Your exact district depends on your address.
Estimated property tax
$5,557 a year
Estimated 2026 property tax for Port Isabel, $300,000 taxable value before exemptions, combined rate 2.183717 per $100.
| Taxing unit | Rate per $100 | Taxable value | Tax |
|---|---|---|---|
| Cameron County | 0.424393 | $300,000 | $1,273 |
| South Texas ISD (magnet district) | 0.049200 | $295,000 | $145 |
| City of Port Isabel | 0.780000 | $300,000 | $2,340 |
| Texas Southmost College District | 0.099734 | $300,000 | $299 |
| Laguna Madre Water District | 0.122090 | $300,000 | $366 |
| Point Isabel ISD | 0.708300 | $160,000 | $1,133 |
| Total (estimate) | 2.183717 | $5,557 |
Estimate. Local-option exemptions and the 65+ school tax ceiling can lower it; your tax office has your exact bill.
What a Port Isabel home pays at $200,000, $300,000 and $400,000
| Appraised value | No exemptions | Homestead | Homestead, 65 or older |
|---|---|---|---|
| $200,000 | $4,367 | $3,373 | $2,948 |
| $300,000 | $6,551 | $5,557 | $5,132 |
| $400,000 | $8,735 | $7,741 | $7,316 |
What the exemptions are worth in Port Isabel
| Exemption | Saves a year | Tax left |
|---|---|---|
| Homestead ($140,000 off Point Isabel ISD, $5,000 off South Texas ISD) | $994 | $5,557 |
| Add 65 or older, or disabled ($60,000 more off Point Isabel ISD) | $425 | $5,132 |
| Add a veteran rating of 70% or more ($12,000 off every unit) | $262 | $5,295 |
| Veteran with a 100% rating or individual unemployability | $5,557 | $0 |
Rules and forms: how each exemption works, the homestead guide and the disabled veteran guide.
New construction in Port Isabel
New-home communities in Port Isabel on this site, with the tax stack each community page uses (school district and combined rate). Community pages use 2025 adopted rates; Cameron County's 2026 adopted rates are in the table above.
- Laguna Heights, Zarate Homes & Designs: Point Isabel ISD, 2.2288 per $100
Protest deadline
Who sends the bill, and when it is due
The Cameron County Tax Assessor-Collector, (956) 544-0800, collects for every taxing unit on these pages. Your statement lists each tax. Online: cameroncountytx.gov.
2026 bills go out in October and November 2026 and are on time if paid by Monday, Feb. 1, 2027, because Jan. 31 falls on a Sunday (Tax Code 31.02, 1.06). Penalties and installment plans.
Nearby cities
Questions
How much are property taxes on a $300,000 house in Port Isabel?
About $6,551 a year with no exemptions, $5,557 with a homestead exemption and $5,132 at 65 or older (2026 rates, Point Isabel ISD).
What is the property tax rate in Port Isabel, TX?
2.1837 per $100 (2.18%) for most homes in 2026: 6 taxing units (2025: 2.2288).
When and where do I pay Port Isabel property taxes?
The Cameron County Tax Assessor-Collector, (956) 544-0800, collects for every taxing unit on these pages. Your statement lists each tax. 2026 bills are on time if paid by Monday, Feb. 1, 2027, because Jan. 31 is a Sunday.
Next steps
- Living in Port Isabel: the Port Isabel community guide.
- Countywide view: Cameron County property tax rates, and all 20 Valley cities compared.
- Mortgage and affordability math: calculators.
From Amy
Protesting your home's value? I can pull recent sales of comparable homes near yours from the MLS for your hearing. I help with single-family homes only, not farms, ranches, duplexes, multifamily or commercial property, and I do not file protests for you. Book a call. I work in English and Spanish.
Sources and method
Units: 14 sampled Cameron Appraisal District 2025 roll records for homes inside Port Isabel city limits (sampled Oct 14, 2026). Rates: checked Oct 16, 2026 against the sources below. Full method and data file.