San Diego ZIP Codes — Duval County, TX

There is one unique ZIP code in San Diego, Texas and it is 78384. Area code: 361.

ZIP codes

591.38

sq mi land

1.45

sq mi water

361

area code

San Diego, TX ZIP code map

About San Diego, TX

San Diego, Texas, is a charming city located in Duval County, known for its rich cultural heritage and friendly community. Nestled in the heart of South Texas, it offers a unique blend of small-town charm and access to larger urban centers. The city serves as a hub for various activities and events that showcase the spirit of its residents.

Location & geography

San Diego is situated approximately 50 miles northwest of Corpus Christi and about 15 miles southwest of the city of Freer. The total land area of San Diego encompasses 591.38 square miles, with an additional water area of 1.45 square miles that contributes to its diverse geography. The terrain is largely flat, with open spaces that make it ideal for agriculture and outdoor activities.

Community & economy

The character of San Diego is shaped by its friendly residents and a strong sense of community. The local economy relies on industries such as agriculture, ranching, and small businesses that provide services to residents and visitors alike. Daily life in San Diego includes engaging in community events, enjoying local cuisine, and participating in cultural celebrations that reflect the city's heritage.

Transportation

San Diego is accessible via several highways, including U.S. Highway 83, which connects the city to other parts of Texas. The nearest airport is in the city of Corpus Christi, providing regional travel options for residents and visitors. Public transportation options are limited, making personal vehicles the primary mode of travel in and around the city.

History

San Diego was founded in the late 19th century and has a history closely tied to agriculture and ranching. Over the years, the city has experienced growth that has transformed it into a vital community within Duval County. Notable events in its history include its role as a cultural center for Hispanic heritage in South Texas.

Did you know?

One surprising fact about San Diego is that it is home to the historic San Diego's La Gente de la Tierra festival, which celebrates the city's rich Hispanic culture. Additionally, the city boasts a friendly, welcoming atmosphere that makes it a hidden gem in South Texas.

ZIP codes for San Diego, TX (1)

ZIP code	City	County	Map
78384	San Diego	Duval	View map

Demographics & statistics

5,510

Population

36.0

Median age

$44,324

Median household income

$18,687

Per capita income

$61,100

Median home value

Median monthly rent

76.9%

Home ownership

22.6%

Poverty rate

10.7%

Unemployment

1,962

Housing units

6.5%

Bachelor's or higher

Age distribution

Male Female

183

Under 5

159

203

5–9

177

284

10–14

247

262

15–19

228

120

20–24

104

317

25–34

275

607

35–44

526

264

45–54

229

193

55–59

167

107

60–64

247

65–74

214

115

75–84

100

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,474	26.8%
18 and over	4,036	73.2%
65 and over	766	13.9%
Median age	36.0 years

Race & ethnicity

White 71.7%

Two or more races 12.9%

Hispanic or Latino 12.7%

Black or African American 1.5%

Other race 0.6%

American Indian / Alaska Native 0.5%

Group	Count	%
White	4,527	71.7%
Two or more races	816	12.9%
Hispanic or Latino	801	12.7%
Black or African American	92	1.5%
Other race	41	0.6%
American Indian / Alaska Native	34	0.5%

Household income

Under $10k 7.2%

$10k–$15k 8.4%

$15k–$25k 10.6%

$25k–$35k 16.2%

$35k–$50k 12.0%

$50k–$75k 16.7%

$75k–$100k 16.0%

$100k–$150k 7.4%

$150k–$200k 3.1%

$200k+ 2.3%

Range	% of households
Under $10k	7.2%
$10k–$15k	8.4%
$15k–$25k	10.6%
$25k–$35k	16.2%
$35k–$50k	12.0%
$50k–$75k	16.7%
$75k–$100k	16.0%
$100k–$150k	7.4%
$150k–$200k	3.1%
$200k+	2.3%
Median income	$44,324

Housing

Home values

Under $50k 38.5%

$50k–$100k 25.7%

$100k–$150k 17.9%

$150k–$200k 8.4%

$200k–$300k 8.0%

$500k–$1M 1.4%

Housing overview

Metric	Value
Median home value	$61,100
Median rent / month	$0
Owner occupied	76.9%
Renter occupied	23.1%
Vacant	31.8%
Single-family detached	82.6%
Large apartment buildings	0.0%
Mobile homes	9.7%
Median rooms	5.4
Avg household size (owned)	2.84

Year built

Era	%
2020 or later	0.0%
2010–2019	0.8%
2000–2009	14.6%
1990–1999	9.8%
1980–1989	17.6%
1970–1979	18.3%
1960–1969	10.0%
1950–1959	17.2%
1940–1949	7.1%
1939 or earlier	4.6%

Bedrooms

Size	% of units
No bedroom (studio)	4.6%
1 bedroom	10.0%
2 bedrooms	25.5%
3 bedrooms	41.9%
4 bedrooms	15.4%
5+ bedrooms	2.6%

Vehicles per household

Vehicles	% of households
No vehicle	12.0%
1 vehicle	32.2%
2 vehicles	35.3%
3 or more	20.5%

Heating fuel

Fuel type	%
Utility gas	24.4%
Electricity	70.4%
Propane / LP gas	2.3%
Solar	0.6%
No fuel used	2.3%

Households & families

Household type	Count	%
Married-couple family	450	28.3%
Cohabiting couple	133	8.4%
Male householder, no spouse	352	22.2%
Female householder, no spouse	654	41.2%
Households with children under 18	521	32.8%
Households with seniors (65+)	595	37.4%
Average household size	3.10

Marital status

Status	Male	Female
Never married	51.9%	42.8%
Married	33.1%	25.0%
Separated	3.0%	1.7%
Widowed	4.5%	11.8%
Divorced	7.4%	18.8%

Education

Less than 9th grade 14.8%

Some HS, no diploma 12.0%

HS graduate 29.9%

Some college, no degree 27.6%

Associate's degree 9.3%

Bachelor's degree 5.6%

Graduate / professional 0.9%

Metric	%
HS diploma or higher	73.2%
Bachelor's or higher	6.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	169	10.4%
Kindergarten	89	5.5%
Elementary school	775	47.7%
High school	465	28.6%
College / grad school	126	7.8%

Employment

Industry of employment

Education & healthcare 28.6%

Agriculture & mining 19.0%

Retail trade 10.7%

Other services 10.7%

Manufacturing 7.1%

Public administration 5.7%

Construction 5.5%

Arts, food & hospitality 4.7%

Professional & management 4.2%

Finance & real estate 2.9%

Transportation & utilities 1.0%

Occupation

Category	%
Management, business & arts	27.3%
Service	20.1%
Sales & office	23.0%
Natural resources & construction	22.1%
Production & transportation	7.5%

Employment type

Type	%
Private sector	85.1%
Government	14.9%
Self-employed	0.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	61.4%
Carpool	22.0%
Public transit	0.0%
Walk	1.2%
Other means	5.0%
Avg commute (minutes)	34.6

Poverty

All people 22.6%

Under 18 years 26.0%

18 and over 21.2%

Married-couple families 8.9%

Female-led households 17.1%

Income support

Source	% of households
Social Security	41.9%
Retirement income	7.6%
Supplemental Security	9.8%
Cash public assistance	3.8%
Food stamps / SNAP	34.3%

Health indicators

Condition	%
High blood pressure	36.2%
High cholesterol	34.7%
Heart disease	7.7%
Stroke	3.7%
Asthma	9.0%
Arthritis	22.5%
Kidney disease	4.1%
Pulmonary disease	6.6%
Cancer	4.6%

Behavior / access	%
Binge drinking	16.1%
No physical activity	40.0%
Less than 7 hrs sleep	35.8%
Fair or poor health	30.1%
Poor mental health	16.3%
Poor physical health	15.5%
No health insurance	49.5%
Visited doctor (checkup)	69.3%
Visited dentist	39.1%
Cholesterol screening	84.7%
Teeth loss	19.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	136	3.4%

Disability	%
Any disability	20.5%
Under 18	15.1%
18–64 years	19.0%
65 and over	38.4%

Health insurance coverage

Type	%
Private insurance	38.7%
Public insurance	50.3%
Uninsured under 19	3.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	5,168	93.8%
Spanish	426	8.2%
Other Indo-European	426	8.2%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	5,425	98.5%
Born in same state	5,414	98.3%
Born in different state	5,155	93.6%
Foreign born	11	0.2%
Naturalized citizen	85	1.5%
Not a US citizen	58	68.2%

Ancestry

Ancestry	Count	%
Arab	135	2.5%
French	65	1.2%
English	60	1.1%

Ancestry	Count	%
Polish	22	0.4%
Italian	12	0.2%

Technology access

Metric	% of households
Computer access	28.8%
Internet access	69.7%

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

Frequently asked questions

What ZIP codes does San Diego, TX have?

San Diego, TX has one ZIP code: 78384. Each ZIP code serves a distinct delivery area within the city and surrounding region.