78118 ZIP Code — Karnes City, TX

Karnes County, Texas

ZIP code 78118 is located in Karnes City, Texas, within Karnes County. It covers approximately 191.81 square miles and serves a population of 4,147 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 830.

About ZIP code 78118

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $110,900. Owner-occupancy is high at 78%, well above the national average.

The gap between median ($61,577) and mean household income suggests income inequality — a small number of higher earners pull the average up. Poverty affects 20% of residents, above the national average. 33% 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. The average commute of 22 minutes is near the national average.

College attainment at 15% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of diabetes (15%) compared to national benchmarks. 25% of residents lack health insurance, above the national average.

Overall, ZIP code 78118 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, high homeownership, and a significant Social Security-dependent population.

4,147

population

191.81

sq mi land

Standard

ZIP type

Central (CT)

timezone

78118 ZIP code map

Cities in ZIP code 78118

Below are the cities the US Postal Service accepts for ZIP code 78118. Using any city not on this list may result in mail delivery delays.

City	Status
Karnes City	Acceptable
Karnes City	Preferred

Nearby ZIP codes

78119 Kenedy (8.1 mi) 78113 Falls City (12.3 mi) 78151 Runge (16.3 mi) 78111 Ecleto (18.1 mi) 78008 Campbellton (19.2 mi) 78116 Gillett (19.3 mi)

Demographics updated 06/2026

Population
Total population	4,147
Population density	22 / sq mi
State FIPS	48
County FIPS	255

Geography
Land area	191.81 sq mi
Water area	1.15 sq mi
Latitude	28.8513
Longitude	-97.9596
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	40.4%	45.6%	39.5%
$50k – $100k	36.3%	27.8%	30.1%
$100k – $200k	19.4%	18.7%	22.6%
Over $200k	3.9%	7.9%	7.8%

Demographics & statistics

4,147

Population

People per sq mi

39.3

Median age

$61,577

Median household income

$29,630

Per capita income

$110,900

Median home value

$829

Median monthly rent

78.1%

Home ownership

20.4%

Poverty rate

6.7%

Unemployment

1,384

Housing units

15.2%

Bachelor's or higher

Age distribution

Male Female

Under 5

141

5–9

135

10–14

159

15–19

105

267

20–24

177

398

25–34

263

324

35–44

214

357

45–54

237

175

55–59

116

175

60–64

116

167

65–74

110

111

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	699	16.9%
18 and over	3,448	83.1%
65 and over	558	13.5%
Median age	39.3 years

Race & ethnicity

White 48.8%

Hispanic or Latino 22.3%

Two or more races 18.3%

Other race 6.1%

Black or African American 4.3%

American Indian / Alaska Native 0.1%

Group	Count	%
White	2,605	48.8%
Hispanic or Latino	1,187	22.3%
Two or more races	977	18.3%
Other race	327	6.1%
Black or African American	232	4.3%
American Indian / Alaska Native	6	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	40.4%	45.6%	39.5%
$50k – $100k	36.3%	27.8%	30.1%
$100k – $200k	19.4%	18.7%	22.6%
Over $200k	3.9%	7.9%	7.8%

Under $10k 2.7%

$10k–$15k 2.3%

$15k–$25k 17.5%

$25k–$35k 4.8%

$35k–$50k 9.0%

$50k–$75k 20.0%

$75k–$100k 10.5%

$100k–$150k 12.9%

$150k–$200k 11.1%

$200k+ 9.1%

Range	% of households
Under $10k	2.7%
$10k–$15k	2.3%
$15k–$25k	17.5%
$25k–$35k	4.8%
$35k–$50k	9.0%
$50k–$75k	20.0%
$75k–$100k	10.5%
$100k–$150k	12.9%
$150k–$200k	11.1%
$200k+	9.1%
Median income	$61,577

Housing

Home values

Under $50k 25.9%

$50k–$100k 22.7%

$100k–$150k 10.1%

$150k–$200k 14.9%

$200k–$300k 14.9%

$300k–$500k 4.6%

$500k–$1M 5.6%

$1M+ 1.3%

Housing overview

Metric	Value
Median home value	$110,900
Median rent / month	$829
Owner occupied	78.1%
Renter occupied	21.9%
Vacant	27.0%
Single-family detached	71.6%
Large apartment buildings	2.4%
Mobile homes	17.0%
Median rooms	5.0
Avg household size (owned)	2.55

Year built

Era	%
2020 or later	0.0%
2010–2019	17.2%
2000–2009	7.6%
1990–1999	7.8%
1980–1989	11.2%
1970–1979	17.7%
1960–1969	10.4%
1950–1959	7.9%
1940–1949	6.9%
1939 or earlier	13.2%

Bedrooms

Size	% of units
No bedroom (studio)	3.1%
1 bedroom	15.3%
2 bedrooms	17.2%
3 bedrooms	48.2%
4 bedrooms	11.8%
5+ bedrooms	4.4%

Vehicles per household

Vehicles	% of households
No vehicle	4.7%
1 vehicle	33.4%
2 vehicles	34.5%
3 or more	27.3%

Heating fuel

Fuel type	%
Utility gas	17.0%
Electricity	74.6%
Propane / LP gas	7.0%
Fuel oil	1.3%

Households & families

Household type	Count	%
Married-couple family	578	48.0%
Cohabiting couple	78	6.5%
Male householder, no spouse	326	27.1%
Female householder, no spouse	221	18.4%
Households with children under 18	305	25.4%
Households with seniors (65+)	361	30.0%
Average household size	2.45

Marital status

Status	Male	Female
Never married	49.8%	32.6%
Married	32.0%	45.2%
Separated	5.7%	3.3%
Widowed	4.3%	9.1%
Divorced	8.1%	9.7%

Education

Less than 9th grade 13.3%

Some HS, no diploma 16.9%

HS graduate 33.9%

Some college, no degree 16.1%

Associate's degree 4.6%

Bachelor's degree 11.8%

Graduate / professional 3.5%

Metric	%
HS diploma or higher	69.8%
Bachelor's or higher	15.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	61	8.3%
Elementary school	351	47.8%
High school	284	38.7%
College / grad school	38	5.2%

Employment

Industry of employment

Education & healthcare 19.2%

Retail trade 16.6%

Agriculture & mining 13.8%

Arts, food & hospitality 8.4%

Public administration 7.9%

Manufacturing 7.2%

Professional & management 6.4%

Information 5.9%

Transportation & utilities 5.3%

Construction 5.2%

Finance & real estate 2.9%

Other services 0.9%

Wholesale trade 0.3%

Occupation

Category	%
Management, business & arts	26.7%
Service	21.9%
Sales & office	20.0%
Natural resources & construction	14.5%
Production & transportation	16.9%

Employment type

Type	%
Private sector	71.8%
Government	21.8%
Self-employed	6.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	77.5%
Carpool	15.8%
Public transit	0.0%
Walk	0.8%
Work from home	5.7%
Other means	0.3%
Avg commute (minutes)	22.3

Poverty

All people 20.4%

Under 18 years 22.1%

18 and over 20.0%

Married-couple families 1.9%

Female-led households 47.7%

Income support

Source	% of households
Social Security	32.6%
Retirement income	22.1%
Supplemental Security	3.4%
Cash public assistance	1.3%
Food stamps / SNAP	15.9%

Health indicators

Condition	%
Obesity	37.8%
High blood pressure	37.1%
High cholesterol	36.3%
Diabetes	15.3%
Heart disease	8.1%
Stroke	3.7%
Asthma	8.8%
Arthritis	24.6%
Kidney disease	3.7%
Pulmonary disease	7.7%
Cancer	6.3%

Behavior / access	%
Smoking	18.6%
Binge drinking	16.5%
No physical activity	32.9%
Less than 7 hrs sleep	33.7%
Depression	20.3%
Fair or poor health	23.8%
Poor mental health	15.0%
Poor physical health	13.7%
No health insurance	39.5%
Visited doctor (checkup)	70.8%
Visited dentist	47.6%
Cholesterol screening	87.6%
Teeth loss	19.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	271	7.9%

Disability	%
Any disability	16.8%
Under 18	1.7%
18–64 years	17.8%
65 and over	38.2%

Health insurance coverage

Type	%
Private insurance	60.1%
Public insurance	23.7%
No insurance	25.4%
Uninsured under 19	15.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	4,099	98.8%
Spanish	762	18.6%
Other Indo-European	706	17.2%
Asian & Pacific Islander	24	0.6%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	3,373	81.3%
Born in same state	3,362	81.1%
Born in different state	2,961	71.4%
Foreign born	11	0.3%
Naturalized citizen	774	18.7%
Not a US citizen	124	16.0%

Ancestry

Ancestry	Count	%
Italian	200	4.8%
Arab	146	3.5%
French	105	2.5%

Ancestry	Count	%
Polish	47	1.1%
German	6	0.1%
Irish	2	0%

Technology access

Metric	% of households
Computer access	29.0%
Internet access	89.3%

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

Frequently asked questions about ZIP code 78118

What city is ZIP code 78118 in?

ZIP code 78118 is primarily assigned to Karnes City, Texas.

What county is ZIP code 78118 in?

ZIP code 78118 falls within Karnes County, Texas.

What is the poverty rate in ZIP code 78118?

20% of residents in ZIP code 78118 live below the poverty line, above the national average.

What is the typical home value in ZIP code 78118?

The median home value in ZIP code 78118 is $110,900.

What is the population of ZIP code 78118?

ZIP code 78118 has an estimated population of 4,147 residents, with a density of 22 people per square mile.

What is the median household income in ZIP code 78118?

The median household income in ZIP code 78118 is $61,577, below the national median of ~$75,000.

What timezone is ZIP code 78118 in?

ZIP code 78118 observes the CST timezone.