San Diego is a city in Duval County, Texas, home to about 3,675 people across 1.9 square miles. Its ZIP code is 78384.
Homes sold for a median of $168 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside San Diego. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up San Diego’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | San Antonio International Airport (SAT)123 miles away |
|---|---|
| Closer regional airport | Corpus Christi International Airport (CRP)46 miles away |
| Nearest city of 250,000+ | Corpus Christi, TX66 miles away |
| Nearest city of 1 million+ | San Antonio, TX118 miles away |
Straight-line distances from the center of San Diego; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
San Diego had 3,748 residents in the 2020 census, down 21% since 2000.
It’s the 514th largest of 1,778 towns in Texas by population.
Duval County grew from 8,483 residents in 1900 to 9,831 in 2020.
Duval County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 97°F in summer, and winter lows average 47°F. About 27.2 inches of rain and melted snow fall in a typical year, with about 1 inches of snow.
Source: NOAA 1991–2020 climate normals, Alice, TX weather station (11 miles away).
1,977 jobs at 144 businesses in Duval County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
4 doctors and other health care providers list an office in San Diego.
Nearest hospitals
Providers with an office here
| Specialist doctors | 1 |
|---|---|
| Nurse practitioners and physician assistants | 1 |
| Mental health providers | 1 |
| Physical and occupational therapists | 1 |
| Pharmacies | 2 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by San Diego ISD. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Collins-Parr ElSan Diego | Pre-K–5 | 688 | Public | 1.0 mi |
| Bernarda Jaime J HSan Diego | 6–8 | 319 | Public | 0.8 mi |
| San Diego H SSan Diego | 9–12 | 446 | Public | 1.4 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.