78631 ZIP Code — Harper, TX

Gillespie County, Texas

ZIP code 78631 is located in Harper, Texas, within Gillespie County. It covers approximately 299.77 square miles and serves a population of 2,818 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 830.

About ZIP code 78631

The housing stock consists of a higher-than-average concentration of mobile homes. Much of the housing stock is relatively new, reflecting recent development activity. Median home value is $310,200. Owner-occupancy is high at 82%, well above the national average.

The gap between median ($66,875) and mean household income suggests income inequality — a small number of higher earners pull the average up. 39% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 38 minutes suggests many residents work outside the immediate area.

Educational attainment is near the national average, with 24% of residents holding a bachelor's degree or higher.

17% of residents lack health insurance, above the national average.

Overall, ZIP code 78631 reflects a community defined by high homeownership and a significant Social Security-dependent population.

2,818
population
299.77
sq mi land
Standard
ZIP type
Central (CT)
timezone
78631 ZIP code map
Cities in ZIP code 78631

Below are the cities the US Postal Service accepts for ZIP code 78631. Using any city not on this list may result in mail delivery delays.

City Status
Harper Acceptable
Harper Preferred
Nearby ZIP codes
78618 Doss (9.6 mi) 78624 Fredericksburg (15.9 mi)
Demographics updated 06/2026
Population
Total population 2,818
Population density 9 / sq mi
State FIPS 48
County FIPS 171
Geography
Land area 299.77 sq mi
Water area 0.17 sq mi
Latitude 30.3171
Longitude -99.1662
Timezone Central (CT)
Area code 830
Total population by age
Gender
Race & ethnicity
Economics updated 06/2026
Household income
Income range This ZIP County avg State avg
Under $50k 42.8% 41.7% 39.5%
$50k – $100k 24.4% 30.3% 30.1%
$100k – $200k 26.2% 21.8% 22.6%
Over $200k 6.6% 6.1% 7.8%

Demographics & statistics

2,818
Population
9
People per sq mi
46.5
Median age
$66,875
Median household income
$34,953
Per capita income
$310,200
Median home value
$1,158
Median monthly rent
81.5%
Home ownership
11.0%
Poverty rate
5.5%
Unemployment
1,276
Housing units
23.7%
Bachelor's or higher

Age distribution

Male Female
56
Under 5
42
108
5–9
81
186
10–14
139
117
15–19
87
7
20–24
5
159
25–34
118
171
35–44
127
67
45–54
50
116
55–59
86
250
60–64
185
271
65–74
201
81
75–84
60
28
85+
20
← Male
Female →

Age summary

GroupCount%
Under 1872425.7%
18 and over2,09474.3%
65 and over66123.5%
Median age46.5 years

Race & ethnicity

White 82%
Hispanic or Latino 8.6%
Two or more races 6.3%
Other race 3%
GroupCount%
White2,53082%
Hispanic or Latino2668.6%
Two or more races1946.3%
Other race943%

Household income

Income range This ZIP County avg State avg
Under $50k 42.8% 41.7% 39.5%
$50k – $100k 24.4% 30.3% 30.1%
$100k – $200k 26.2% 21.8% 22.6%
Over $200k 6.6% 6.1% 7.8%
Under $10k 3.0%
$10k–$15k 4.7%
$15k–$25k 10.6%
$25k–$35k 7.4%
$35k–$50k 10.8%
$50k–$75k 20.2%
$75k–$100k 10.0%
$100k–$150k 10.1%
$150k–$200k 13.6%
$200k+ 9.6%
Range% of households
Under $10k3.0%
$10k–$15k4.7%
$15k–$25k10.6%
$25k–$35k7.4%
$35k–$50k10.8%
$50k–$75k20.2%
$75k–$100k10.0%
$100k–$150k10.1%
$150k–$200k13.6%
$200k+9.6%
Median income$66,875

Housing

Home values

$50k–$100k 13.2%
$100k–$150k 7.1%
$150k–$200k 6.3%
$200k–$300k 22.4%
$300k–$500k 21.8%
$500k–$1M 20.0%
$1M+ 9.4%

Housing overview

MetricValue
Median home value$310,200
Median rent / month$1,158
Owner occupied81.5%
Renter occupied18.5%
Vacant30.3%
Single-family detached64.8%
Large apartment buildings1.6%
Mobile homes33.6%
Median rooms5.5
Avg household size (owned)2.85

Year built

Era%
2020 or later0.0%
2010–201923.9%
2000–200921.9%
1990–199916.2%
1980–198913.4%
1970–19798.3%
1960–19692.6%
1950–19592.5%
1940–19491.0%
1939 or earlier10.0%

Bedrooms

Size% of units
No bedroom (studio)0.0%
1 bedroom6.0%
2 bedrooms19.3%
3 bedrooms49.6%
4 bedrooms20.1%
5+ bedrooms5.0%

Vehicles per household

Vehicles% of households
No vehicle2.4%
1 vehicle27.7%
2 vehicles37.3%
3 or more32.6%

Heating fuel

Fuel type%
Utility gas0.6%
Electricity75.5%
Propane / LP gas14.3%
Wood7.2%

Households & families

Household typeCount%
Married-couple family73972.4%
Cohabiting couple363.5%
Male householder, no spouse807.8%
Female householder, no spouse16616.3%
Households with children under 1839638.8%
Households with seniors (65+)43242.3%
Average household size2.76

Marital status

StatusMaleFemale
Never married18.9%15.9%
Married63.0%68.7%
Separated4.6%2.1%
Widowed1.8%11.0%
Divorced11.7%2.4%

Education

Less than 9th grade 4.0%
Some HS, no diploma 4.5%
HS graduate 33.9%
Some college, no degree 28.0%
Associate's degree 5.8%
Bachelor's degree 10.5%
Graduate / professional 13.2%
Metric%
HS diploma or higher91.5%
Bachelor's or higher23.7%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool121.8%
Kindergarten6810.3%
Elementary school34151.7%
High school18928.6%
College / grad school507.6%

Employment

Industry of employment

Education & healthcare 24.6%
Retail trade 13.4%
Finance & real estate 10.1%
Professional & management 8.6%
Arts, food & hospitality 8.1%
Agriculture & mining 7.6%
Other services 6.8%
Transportation & utilities 6.4%
Public administration 5.0%
Construction 4.6%
Information 1.9%
Wholesale trade 1.5%
Manufacturing 1.4%

Occupation

Category%
Management, business & arts37.9%
Service24.4%
Sales & office19.9%
Natural resources & construction3.3%
Production & transportation14.5%

Employment type

Type%
Private sector64.5%
Government21.1%
Self-employed14.4%
Unpaid family workers0.0%

Commute

Method%
Drive alone80.1%
Carpool14.5%
Public transit0.0%
Walk0.0%
Work from home5.4%
Other means0.0%
Avg commute (minutes)37.8

Poverty

All people 11.0%
Under 18 years 10.3%
18 and over 11.2%
Married-couple families 8.5%
Female-led households 27.6%

Income support

Source% of households
Social Security39.4%
Retirement income22.9%
Supplemental Security8.1%
Cash public assistance2.1%
Food stamps / SNAP5.5%

Health indicators

Condition%
Obesity34.9%
High blood pressure38.8%
High cholesterol40.6%
Diabetes12.3%
Heart disease7.9%
Stroke3.4%
Asthma8.8%
Arthritis27.8%
Kidney disease3.3%
Pulmonary disease7.9%
Cancer8.2%
Behavior / access%
Smoking17.1%
Binge drinking17.1%
No physical activity22.8%
Less than 7 hrs sleep31.6%
Depression21.6%
Fair or poor health15.9%
Poor mental health13.7%
Poor physical health11.6%
No health insurance19.8%
Visited doctor (checkup)73.8%
Visited dentist61.1%
Cholesterol screening92.4%
Teeth loss12.1%

Veterans & disability

VeteransCount%
Civilian veterans1507.2%
Disability%
Any disability20.9%
Under 1810.1%
18–64 years20.0%
65 and over34.8%

Health insurance coverage

Type%
Private insurance60.5%
Public insurance34.5%
No insurance17.3%
Uninsured under 1924.7%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only2,72096.5%
Spanish301.1%
Other Indo-European301.1%
Asian & Pacific Islander00.0%
Other languages00.0%

Place of birth & citizenship

OriginCount%
Native born (US)2,75697.8%
Born in same state2,75697.8%
Born in different state2,23879.4%
Foreign born00.0%
Naturalized citizen622.2%
Not a US citizen1930.6%

Ancestry

AncestryCount%
Italian45716.2%
French30510.8%
Arab1726.1%
AncestryCount%
Irish712.5%
English80.3%

Technology access

Metric% of households
Computer access36.2%
Internet access91.7%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 78631

What city is ZIP code 78631 in?

ZIP code 78631 is primarily assigned to Harper, Texas.

What county is ZIP code 78631 in?

ZIP code 78631 falls within Gillespie County, Texas.

Is ZIP code 78631 mostly owner-occupied?

82% of occupied units in ZIP code 78631 are owner-occupied, well above the national average.

Does ZIP code 78631 have a large retiree population?

39% of households in ZIP code 78631 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 78631?

The median home value in ZIP code 78631 is $310,200.

What is the population of ZIP code 78631?

ZIP code 78631 has an estimated population of 2,818 residents, with a density of 9 people per square mile.

What timezone is ZIP code 78631 in?

ZIP code 78631 observes the CST timezone.

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