ZIP code 78588 covers San Isidro, Texas in Starr County. This area is served by 16 utility providers across 3 categories. The average residential electricity rate here is 11.4¢/kWh. 96.8% of households use electricity as their primary heating fuel.
Estimated monthly utility costs
$150/month
Cost estimates from U.S. Census ACS 5-year data · Shorter bar = lower cost
Electric
Water
Internet
Nearby ZIP codes
Frequently asked questions
How do I set up utilities when moving to 78588?
Contact each provider separately before your move-in date. Start with electric (AEP Texas Central Company) since those typically need a few business days to activate. Water and sewer are often handled with one call to your local utility. Set up internet last since it may require an installation visit.
How much do utilities cost per month in 78588?
Total estimated monthly costs are around $150, which is about $233 less than the national average. Electricity is the biggest expense at roughly $125/month. Natural gas runs about $25. Costs vary by home size, usage, and season. Estimates from U.S. Census ACS data.
Is electricity expensive in 78588?
No — electricity in San Isidro, TX costs about 24% less than the national average. Compared to Texas overall, rates here are about 16% lower. Based on 2023 NREL residential electricity rate data.
What internet providers are available in 78588?
San Isidro, TX has strong broadband coverage. Providers include AT&T (Fixed Wireless up to 100 Mbps), T-Mobile (Fixed Wireless up to 100 Mbps), Valley Telephone Cooperative Inc (Fiber / Fixed Wireless / DSL up to 1,000 Mbps), Verizon (Fixed Wireless up to 300 Mbps). Availability varies by street address. Based on FCC Broadband Data Collection filings.
What county is 78588 in?
ZIP code 78588 is in Starr County, Texas.
Disclaimer: Provider information is sourced from federal databases including HIFLD, EPA SDWIS, FCC Broadband Data, and EIA-861. Utility cost estimates are from the U.S. Census Bureau American Community Survey 5-Year Estimates. Electric rates are based on 2023 NREL data. Coverage areas are approximate and may not reflect recent changes. Please verify directly with your provider.
Data sources: U.S. Census Bureau, NREL, EIA-861, HIFLD, EPA, FCC. Last updated: April 2026.