THE SEBASTIAN LAND BRIEF
Land in the
Lower Rio Grande Valley setting.
Sebastian CDP has 1.67 square miles of land in Willacy County. Its Census reference point is in Lower Rio Grande Valley, within Western Gulf Coastal Plain.
Low coastal plains extend along the western Gulf, contrasting with more irregular inland country. Grassland was the principal natural cover, with river corridors and coastal features adding local variation.
Regional context: Western Gulf Coastal Plain ↗ · Classification at the Census reference point
Sebastian and Willacy County
Sebastian is associated with Willacy County in the Census boundary data. Start with the parcel’s tax bill to match the property to that jurisdiction, then confirm which government handles its land use.
Sebastian by land and water
The Census records <0.01 square miles of water within Sebastian, or 0.2% of its total area. It is 24.6 percentage points lower than the 24.7% recorded for Willacy County. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Sebastian CDP has 30.6% of the land area of nearby Yznaga CDP (5.45 square miles). These areas describe boundaries, not comparable property prices.

