Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/TX/SAN-ISIDRO

San Isidro ZIP code, Texas

The ZIP code for San Isidro, TX is 78588, and its area code is 956.

USPS city name
1 ZIP code
Overlapping the city
1 more
Population
214
Area code
956
State
Texas

Mail addressed to San Isidro uses the ZIP code above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

San Isidro in numbers

About 214 people live in San Isidro, in 86 households. The median owner-occupied home is valued at $47,100 (83% below the Texas median). The median age is 51.7; 26.3% of adults 25 and over hold a bachelor's degree or higher (33.8% across Texas); the average commute takes 18 minutes.

Population214San Isidro214
Households86San Isidro86
Median age51.7San Isidro51.7Texas35.6US 38.9
Median home value$47,100San Isidro$47,100Texas$283,800US $332,700
Bachelor's degree or higher26.3%San Isidro26.3%Texas33.8%US 35.7%
Mean commute17.7 minSan Isidro17.7 minTexas26.7 minUS 26.4 min
Population density69 / sq miSan Isidro69 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place San Isidro CDP. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as San Isidro

ZIP codes with the USPS city name San Isidro
ZIP City Type Population Median income Median home
78588 San Isidro , TX Standard 289 $94,821 $52,800

Other ZIP codes overlapping San Isidro

These ZIP codes cover part of San Isidro but are addressed as somewhere else.

ZIP codes overlapping San Isidro
ZIP City Type Population Median income Median home
78536 Delmita , TX Standard 371 $28,393 —

Map of San Isidro ZIP codes

78588

The ZIP codes of San Isidro, TX, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near San Isidro

The nearest larger towns are Linn (801 people, 22 mi), Salida del Sol Estates (7,766 people, 27 mi) and Citrus City (2,395 people, 27 mi).

Towns near San Isidro
TownPopulationDistance
Salida del Sol Estates 7,766 26.8 mi

More nearby: every ZIP code in Starr County · Texas ZIP codes

Cite this page

zipcodes.pro. “San Isidro, TX ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/tx/san-isidro

Underlying data is public domain or openly licensed — sources, vintages and licences.