High-Speed Internet in Castroville, TX $65/month Flat Rate

Zip codes served: 78009

Castroville is one of the more complicated coverage situations in our territory — the older neighborhoods closer to the historic district have seen AT&T fiber expansion on some streets, while outlying areas along FM 471 and outside the city limits remain satellite-or-nothing. STI's fixed wireless covers the majority of 78009, including neighborhoods that AT&T hasn't reached.

If you work remotely or run a business out of Castroville, the difference between AT&T fiber and STI isn't huge on speed — but STI has no annual contract and no installation fees. If AT&T hasn't run fiber to your street yet, STI is 400 Mbps now, not whenever the fiber truck shows up.

Castroville's proximity to San Antonio (30 minutes on US-90) means a lot of residents commute and work hybrid. Reliable upload speed — for video calls, shared drives, VPNs — matters as much as download. STI delivers 25 Mbps up consistently. That's what remote work actually runs on.

The Little Alsace of Texas

Castroville was founded in 1844 by empresario Henri Castro, who brought Alsatian immigrant families from the France-Germany border region to settle the Medina River valley — the only Alsatian colony ever established in the United States. That heritage still shapes the town: half-timbered stone cottages, Alsatian street names, and a downtown that looks more like eastern France than South Texas.

Medina County's Original County Seat

Before Hondo existed as a town, Castroville was the county seat of Medina County — a title it held from incorporation in 1850 until an 1892 election moved the courthouse to Hondo. Today Castroville sits on US 90 about 16 miles east of our home base, with the Medina River running through the middle of town and Medina Valley ISD serving local students. It's one of the more established, service-dense parts of our coverage area.

Castroville incorporated on January 16, 1850, making it one of the older incorporated towns in this part of Texas, and its population has grown to just under 3,000 residents as of the 2020 census. That combination of historic charm and steady growth means more households every year need real broadband — not the copper DSL infrastructure built decades before anyone imagined streaming video or working from home.