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| City | Castell |
| State | Texas (TX) |
| County | Llano |
| Country | United States of America |
| Timezone | Central Time (America/Chicago) |
| Latitude | 30.701013 |
| Longitude | -98.956437 |
| Population | 280 |
| Density | 5.0 /km² |
| Incorporated | N/A |
| ZIP Code(s) | 78643, 76831 |
| Area Code | 512, 737, 325 |
| County Seat | Llano |
Castell is a locality in Llano County, Texas, United States. It is a small community with a population of 280. The population density is 5.0 people per km². Castell is located at 30.7010°N, 98.9564°W. It observes the Central Time (America/Chicago) timezone. ZIP code: 76831.
Castell lies cradled by the rolling Texas Hill Country, a place where the Lampasas River, a ribbon of shimmering silver, carves its way through rugged terrain. It lies 66.1 miles west of Leander, TX (from Leander, TX: bearing 278°T), and is situated 17.2 miles west-south-west of Llano. The land here is a study in contrasts: sun-baked cedar brakes cling to rocky outcrops, their scent sharp and resinous on the warm air, while down in the river bottoms, sycamores and live oaks spread their generous shade, their leaves whispering secrets to the passing breeze. The sky above is a vast, ever-changing canvas, often a brilliant, unapologetic blue that deepens to an indigo so profound at dusk it seems to swallow the very stars, leaving only the pale glow of distant farm lights to mark the human presence in this wild, untamed expanse. The history of Castell is as deeply rooted as the ancient mesquite trees dotting its landscape, a story woven with the hardy spirit of early settlers who sought sustenance and a quiet life along the river's banks. For generations, the local economy has been shaped by the fertile soil and the gentle flow of the Lampasas, supporting ranches where cattle graze on the abundant grasses and small farms that yield crops suited to the Texas sun. While the modern world has brought its own currents, the heart of Castell still beats to a rhythm set by the land and the enduring traditions of its people, a quiet resilience evident in the weathered barns and the friendly nods exchanged on the infrequent paved road that winds through the community, a place where time itself seems to move a little slower, allowing for a deeper appreciation of the enduring beauty of the Hill Country.
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This page provides an embedded street and satellite map of Castell, Texas — switch between views using the small square in the bottom left-hand corner of the map. Coordinates: 30.701013, -98.956437. Live weather conditions are sourced directly from the National Weather Service, with current observations and a 7-day forecast also powered by Open-Meteo. Real-time local news and world news feeds keep the page current, while a Wikipedia summary or an editorially written description provides background on Castell and Llano County.
Detailed location data for Castell includes the ZIP code (78643), telephone area code (512, 737, 325), county seat of Llano County (Llano), and school district assignment. These are among the most commonly searched location details for any US city or town.
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity — ensuring the correct Castell is identified even where the name is shared across multiple counties or states. Population figures are sourced from the 2020 US Census.
| Page generated | July 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. Location verified by proximity — not name matching alone. |