Sebastian is a community in Willacy County, Texas, home to about 1,021 people across 1.7 square miles. Its ZIP code is 78594.
Homes sold for a median of $97 per square foot in the three months ending August 2026.
Mostly Sebastian; also Zapata Ranch
Each card is that ZIP code’s whole market, including any part outside Sebastian. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | San Antonio International Airport (SAT)224 miles away |
|---|---|
| Closer regional airport | Valley International Airport (HRL)13 miles away |
| Nearest city of 250,000+ | Corpus Christi, TX105 miles away |
| Nearest city of 1 million+ | San Antonio, TX219 miles away |
Straight-line distances from the center of Sebastian; 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.
Sebastian had 1,684 residents in the 2020 census, down 10% since 2000.
It’s the 1007th largest of 1,778 towns in Texas by population.
Willacy County grew from 10,499 residents in 1930 to 20,164 in 2020.
Willacy County, 1930–2020
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 49°F. About 24.7 inches of rain and melted snow fall in a typical year, with about 0 inches of snow.
Source: NOAA 1991–2020 climate normals, Santa Rosa 3 Wnw, TX weather station (7 miles away).
3,004 jobs at 189 businesses in Willacy County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
2 doctors and other health care providers list an office in Sebastian.
Nearest hospitals
Providers with an office here
| Mental health providers | 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.
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Shares ZIP codes with Zapata Ranch.
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.