Every taxing unit on a Rio Grande City bill
Your bill adds up one line per taxing unit. These are the units on the 2025 appraisal roll for homes inside Rio Grande City city limits, with Rio Grande City Grulla ISD as the school district. Rates are dollars per $100 of taxable value.
| Taxing unit | M&O 2025 | I&S 2025 | 2025 rateadopted | Sources |
|---|---|---|---|---|
| Starr CountyCountyIncludes farm-to-market/flood control 0.1984 | 0.660600 | 0.048000 | 0.708600 | Comptroller 2025 county file, Starr CAD roll record, Starr CAD roll record (Roma) |
| Starr County Memorial Hospital DistrictHospital district | 0.250400 | 0.000000 | 0.250400 | Comptroller 2025 special district file, Starr CAD roll record, Starr CAD roll record (Roma) |
| Starr County Drainage DistrictDrainage district | 0.001500 | 0.000000 | 0.001500 | Comptroller 2025 special district file, Starr CAD roll record, Starr CAD roll record (Roma) |
| South Texas College DistrictCollege district | 0.140000 | 0.022000 | 0.162000 | Comptroller 2025 special district file, Starr CAD roll record |
| City of Rio Grande CityCity | 0.393113 | 0.136887 | 0.530000 | Comptroller 2025 city file, Starr CAD roll record |
| Rio Grande City Grulla ISDSchool district | 0.693200 | 0.534700 | 1.227900 | Comptroller 2025 school file, Starr CAD roll record |
| Combined (Rio Grande City Grulla ISD) | 2.880400 |
What makes up the Rio Grande City rate
Rio Grande City Grulla ISD is the biggest line on a Rio Grande City bill: 1.2279 of the 2.8804 per $100, or 43% of the 2025 total. The countywide units (Starr County, Starr County Memorial Hospital District, Starr County Drainage District and South Texas College District) add 1.1225.
The City of Rio Grande City's own 2025 rate is 0.5300, lower than Roma's 0.548166.
At 2025 rates, Rio Grande City's combined 2.8804 is the highest of the 20 Valley cities on this site.
Which school district?
The 2020 Census places all of the homes inside Rio Grande City city limits in Rio Grande City Grulla ISD, so the table above uses it. Your district depends on your exact address. Look it up on the Starr Central 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 5,410 housing units inside Rio Grande City city limits.
Units that tax only some homes
No other taxing units showed up on the sampled Rio Grande City roll record (one record was checked), so a lot elsewhere in Rio Grande City city limits may carry a unit not listed here. 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 Rio Grande City 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 Rio Grande City 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
$6,916 a year
Estimated 2025 property tax for Rio Grande City, $300,000 taxable value before exemptions, combined rate 2.880400 per $100.
| Taxing unit | Rate per $100 | Taxable value | Tax |
|---|---|---|---|
| Starr County | 0.708600 | $300,000 | $2,120 |
| Starr County Memorial Hospital District | 0.250400 | $300,000 | $751 |
| Starr County Drainage District | 0.001500 | $300,000 | $5 |
| South Texas College District | 0.162000 | $300,000 | $486 |
| City of Rio Grande City | 0.530000 | $300,000 | $1,590 |
| Rio Grande City Grulla ISD | 1.227900 | $160,000 | $1,965 |
| Total (estimate) | 2.880400 | $6,916 |
Estimate. Local-option exemptions and the 65+ school tax ceiling can lower it; your tax office has your exact bill.
What a Rio Grande City home pays at $200,000, $300,000 and $400,000
| Appraised value | No exemptions | Homestead | Homestead, 65 or older |
|---|---|---|---|
| $200,000 | $5,761 | $4,036 | $3,299 |
| $300,000 | $8,641 | $6,916 | $6,179 |
| $400,000 | $11,522 | $9,797 | $9,060 |
What the exemptions are worth in Rio Grande City
| Exemption | Saves a year | Tax left |
|---|---|---|
| Homestead ($140,000 off Rio Grande City Grulla ISD, $3,000 off FM&FC) | $1,725 | $6,916 |
| Add 65 or older, or disabled ($60,000 more off Rio Grande City Grulla ISD) | $737 | $6,179 |
| Add a veteran rating of 70% or more ($12,000 off every unit) | $346 | $6,571 |
| Veteran with a 100% rating or individual unemployability | $6,916 | $0 |
Rules and forms: how each exemption works, the homestead guide and the disabled veteran guide.
New construction in Rio Grande City
New-home communities in Rio Grande City on this site, with the tax stack each community page uses (school district and combined rate). Community pages use 2025 adopted rates.
- Build on Your Lot - Starr County, South Texas Builders: Rio Grande City Grulla ISD, 2.8804 per $100
- The Heights IV, Altura Development: Rio Grande City Grulla ISD, 2.8804 per $100
Protest deadline
Who sends the bill, and when it is due
The Starr County Tax Assessor-Collector, (956) 716-4800, collects for Starr County, its three school districts (Rio Grande City Grulla, San Isidro and Roma ISDs) and the City of Roma. Starr County Memorial Hospital District, Starr County Drainage District, South Texas College District and the City of Rio Grande City are not on its list in the Comptroller's county directory, so those taxes may come on a separate bill; your statement shows who collects each tax. Online: co.starr.tx.us.
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 Rio Grande City?
About $8,641 a year with no exemptions, $6,916 with a homestead exemption and $6,179 at 65 or older (2025 rates, Rio Grande City Grulla ISD).
What is the property tax rate in Rio Grande City, TX?
2.8804 per $100 (2.88%) for most homes in 2025: 6 taxing units.
When and where do I pay Rio Grande City property taxes?
The Starr County Tax Assessor-Collector, (956) 716-4800, collects for Starr County, its three school districts (Rio Grande City Grulla, San Isidro and Roma ISDs) and the City of Roma. Starr County Memorial Hospital District, Starr County Drainage District, South Texas College District and the City of Rio Grande City are not on its list in the Comptroller's county directory, so those taxes may come on a separate bill; your statement shows who collects each tax. 2026 bills are on time if paid by Monday, Feb. 1, 2027, because Jan. 31 is a Sunday.
Next steps
- Living in Rio Grande City: the Rio Grande City community guide.
- Countywide view: Starr 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: one Starr Central Appraisal District 2025 roll record for a Rio Grande City home (sampled Oct 14, 2026). Rates: checked Oct 16, 2026 against the sources below. Full method and data file.