78588 ZIP Code — San Isidro, TX
Starr County, Texas
ZIP code 78588 is located in San Isidro, Texas, within Starr County. It covers approximately 36.62 square miles and serves a population of 124 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 956.
124
population
36.62
sq mi land
Standard
ZIP type
Central (CT)
timezone
78588 ZIP code map
Cities in ZIP code 78588
Below are the cities the US Postal Service accepts for ZIP code 78588. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| San Isidro | Preferred |
Nearby ZIP codes
Demographics
updated 06/2026
| Population | |
|---|---|
| Total population | 124 |
| Population density | 3 / sq mi |
| State FIPS | 48 |
| County FIPS | 427 |
| Geography | |
|---|---|
| Land area | 36.62 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 26.7314 |
| Longitude | -98.4144 |
| Timezone | Central (CT) |
| Area code | 956 |
Total population by age
Gender
Race & ethnicity
Economics
updated 06/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 89.7% | 70.3% | 39.5% |
| $50k – $100k | 7.7% | 18.5% | 30.1% |
| $100k – $200k | 2.6% | 9.1% | 22.6% |
| Over $200k | 0.0% | 2.2% | 7.8% |
Demographics & statistics
124
Population
3
People per sq mi
52.2
Median age
$0
Median household income
$22,016
Per capita income
$22,700
Median home value
$0
Median monthly rent
70.5%
Home ownership
10.5%
Poverty rate
0.0%
Unemployment
85
Housing units
18.1%
Bachelor's or higher
Age distribution
Male
Female
0
Under 5
1
3
5–9
3
5
10–14
6
5
15–19
7
4
25–34
5
3
35–44
3
18
45–54
23
1
65–74
2
10
75–84
13
5
85+
7
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 30 | 24.2% |
| 18 and over | 94 | 75.8% |
| 65 and over | 38 | 30.6% |
| Median age | 52.2 years | |
Race & ethnicity
Hispanic or Latino
34.7%
White
30.5%
Other race
18.9%
Two or more races
15.8%
| Group | Count | % |
|---|---|---|
| Hispanic or Latino | 66 | 34.7% |
| White | 58 | 30.5% |
| Other race | 36 | 18.9% |
| Two or more races | 30 | 15.8% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 89.7% | 70.3% | 39.5% |
| $50k – $100k | 7.7% | 18.5% | 30.1% |
| $100k – $200k | 2.6% | 9.1% | 22.6% |
| Over $200k | 0.0% | 2.2% | 7.8% |
Under $10k
11.4%
$10k–$15k
4.5%
$15k–$25k
27.3%
$35k–$50k
20.5%
$75k–$100k
6.8%
$100k–$150k
29.5%
| Range | % of households |
|---|---|
| Under $10k | 11.4% |
| $10k–$15k | 4.5% |
| $15k–$25k | 27.3% |
| $35k–$50k | 20.5% |
| $75k–$100k | 6.8% |
| $100k–$150k | 29.5% |
| Median income | $0 |
Housing
Home values
Under $50k
100.0%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $22,700 |
| Median rent / month | $0 |
| Owner occupied | 70.5% |
| Renter occupied | 29.5% |
| Vacant | 55.1% |
| Single-family detached | 80.6% |
| Large apartment buildings | 0.0% |
| Mobile homes | 9.2% |
| Median rooms | 5.2 |
| Avg household size (owned) | 2.87 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 5.1% |
| 2000–2009 | 26.5% |
| 1990–1999 | 12.2% |
| 1980–1989 | 0.0% |
| 1970–1979 | 0.0% |
| 1960–1969 | 24.5% |
| 1950–1959 | 23.5% |
| 1940–1949 | 8.2% |
| 1939 or earlier | 0.0% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.0% |
| 1 bedroom | 3.1% |
| 2 bedrooms | 26.5% |
| 3 bedrooms | 31.6% |
| 4 bedrooms | 36.7% |
| 5+ bedrooms | 2.0% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 0.0% |
| 1 vehicle | 68.2% |
| 2 vehicles | 27.3% |
| 3 or more | 4.5% |
Heating fuel
| Fuel type | % |
|---|---|
| Electricity | 88.6% |
| Propane / LP gas | 11.4% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 5 | 11.4% |
| Cohabiting couple | 0 | 0.0% |
| Male householder, no spouse | 9 | 20.5% |
| Female householder, no spouse | 30 | 68.2% |
| Households with children under 18 | 15 | 34.1% |
| Households with seniors (65+) | 22 | 50.0% |
| Average household size | 2.82 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 65.1% | 46.0% |
| Married | 14.0% | 6.3% |
| Separated | 0.0% | 0.0% |
| Widowed | 0.0% | 47.6% |
| Divorced | 20.9% | 0.0% |
Education
Less than 9th grade
14.9%
Some HS, no diploma
2.1%
HS graduate
19.1%
Some college, no degree
39.4%
Associate's degree
6.4%
Bachelor's degree
4.3%
Graduate / professional
13.8%
| Metric | % |
|---|---|
| HS diploma or higher | 83.0% |
| Bachelor's or higher | 18.1% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 1 | 3.4% |
| Kindergarten | 0 | 0.0% |
| Elementary school | 16 | 55.2% |
| High school | 12 | 41.4% |
| College / grad school | 0 | 0.0% |
Employment
Industry of employment
Education & healthcare
89.5%
Agriculture & mining
10.5%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 89.5% |
| Service | 0.0% |
| Sales & office | 0.0% |
| Natural resources & construction | 0.0% |
| Production & transportation | 10.5% |
Employment type
| Type | % |
|---|---|
| Private sector | 15.8% |
| Government | 73.7% |
| Self-employed | 10.5% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 10.5% |
| Carpool | 0.0% |
| Public transit | 0.0% |
| Walk | 89.5% |
| Work from home | 0.0% |
| Other means | 0.0% |
| Avg commute (minutes) | 0.0 |
Poverty
All people
10.5%
Under 18 years
0.0%
18 and over
13.8%
Married-couple families
0.0%
Female-led households
18.5%
Income support
| Source | % of households |
|---|---|
| Social Security | 50.0% |
| Retirement income | 52.3% |
| Supplemental Security | 4.5% |
| Cash public assistance | 0.0% |
| Food stamps / SNAP | 27.3% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 41.5% |
| High blood pressure | 41.9% |
| High cholesterol | 40.7% |
| Diabetes | 21.4% |
| Heart disease | 9.0% |
| Stroke | 3.9% |
| Asthma | 8.4% |
| Arthritis | 26.3% |
| Kidney disease | 4.5% |
| Pulmonary disease | 6.6% |
| Cancer | 6.2% |
| Behavior / access | % |
|---|---|
| Smoking | 15.0% |
| Binge drinking | 13.9% |
| No physical activity | 35.9% |
| Less than 7 hrs sleep | 33.3% |
| Depression | 17.5% |
| Fair or poor health | 27.4% |
| Poor mental health | 13.1% |
| Poor physical health | 15.0% |
| No health insurance | 40.3% |
| Visited doctor (checkup) | 74.9% |
| Visited dentist | 49.6% |
| Cholesterol screening | 92.0% |
| Teeth loss | 14.0% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 0 | 0.0% |
| Disability | % |
|---|---|
| Any disability | 25.0% |
| Under 18 | 23.3% |
| 18–64 years | 32.1% |
| 65 and over | 15.8% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 62.1% |
| Public insurance | 47.6% |
| No insurance | 12.1% |
| Uninsured under 19 | 0.0% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 123 | 99.2% |
| Spanish | 0 | 0.0% |
| Other Indo-European | 0 | 0.0% |
| Asian & Pacific Islander | 0 | 0.0% |
| Other languages | 0 | 0.0% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 124 | 100.0% |
| Born in same state | 124 | 100.0% |
| Born in different state | 124 | 100.0% |
| Foreign born | 0 | 0.0% |
| Naturalized citizen | 0 | 0.0% |
| Not a US citizen | 0 | 0.0% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 35.5% |
| Internet access | 72.7% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 78588
What city is ZIP code 78588 in?
ZIP code 78588 is primarily assigned to San Isidro, Texas.
What county is ZIP code 78588 in?
ZIP code 78588 falls within Starr County, Texas.
Does ZIP code 78588 have an older population?
31% of residents in ZIP code 78588 are 65 or older, above the national average of ~17%.
Does ZIP code 78588 have a large retiree population?
50% of households in ZIP code 78588 receive Social Security income, suggesting a significant retiree or disability population.
What is the typical home value in ZIP code 78588?
The median home value in ZIP code 78588 is $22,700.
What is the population of ZIP code 78588?
ZIP code 78588 has an estimated population of 124 residents, with a density of 3 people per square mile.
What timezone is ZIP code 78588 in?
ZIP code 78588 observes the CST timezone.