San Diego, Texas
San Diego is the seat of Duval County, in the South Texas brush country west of Corpus Christi and northeast of Laredo. The town sits amid the ranching lands and mesquite country of the region, an area with deep roots in Spanish and Mexican land grants that predate the county itself. It served as an early trade and county center as the surrounding country was settled through the nineteenth century.
Place essentials
Official Census snapshot- Census place type
- City
- July 2025 population
- 3,503
- Change from 2020 base
- -6.4%
- Land area
- 1.9 sq. mi.
- County footprint
- Duval County and Jim Wells County
Place type, county footprint, and land area use the Census Bureau's January 1, 2025 geography. Population uses Vintage 2025 estimates through July 1, 2025; change compares that estimate with the April 1, 2020 estimates base. Geography file | Population file
San Diego crosses county lines, so the appraisal district and tax office depend on the parcel address. School, city-limit, MUD, PID, and other special-district lines can be different too. Start with the full county list below instead of treating one county as the answer.
Official routes
Use the office for the parcel address; a mailing city is not always the governing city.
County context
What to know around San Diego
County lines carry much of the property, land, water, and outdoors context around San Diego.
County History
Duval County Was Named for a Victim of the Goliad Massacre
Duval County was created in 1858 and named for Burr H. Duval, a soldier killed during the Texas Revolution.
Property Tax
Who Sets Your Property Tax Bill in Duval County
In San Diego, the office that decides what your land is worth sits a few blocks from the one that takes your money, and you can't argue your bill at the second.
County Seat History
Alice took three names before the post office made one stick
The railroad junction was called Bandana and then Kleberg before an 1888 post office fixed the name Alice on the map.
Nearby
Places near San Diego
Nearby counties
Local notes for nearby counties
Next steps for San Diego
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