THE COSTILLA COUNTY LAND BRIEF
Land in the
San Luis Shrublands and Hills setting.
Costilla County has 1,227.6 square miles of land in Colorado. 10 mapped landscape regions meet across Costilla County: San Luis Shrublands and Hills, San Luis Alluvial Flats and Wetlands, Crystalline Subalpine Forests, among others.
Plains and mesa tops alternate with steep tableland edges in this transition between deserts, grasslands and forested mountains. Local relief changes sharply even within the broader plateau setting.
Regional context: Arizona/New Mexico Plateau ↗ · Regional mapping across the county footprint
Where the landscape changes
Costilla County intersects 10 mapped regional units. The largest mapped shares are:
- San Luis Shrublands and Hills22.6%
- San Luis Alluvial Flats and Wetlands22.3%
- Crystalline Subalpine Forests21.1%
- Foothill Shrublands10.6%
- Salt Flats6.4%
Southern Rockies in Costilla County
Steep mountains rise through distinct vegetation bands, from lower grass and shrub country to conifers and alpine terrain. Elevation is a defining difference across Southern Rocky Mountain landscapes.
Read the regional source ↗Finding your parcel within Costilla County
The atlas lists 4 cities, towns, townships, and Census communities associated with Costilla County, including Blanca, San Acacio, San Luis. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Costilla County by land and water
The Census records 3.41 square miles of water within Costilla County, or 0.3% of its total area. That share is close to Costilla County’s 0.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Costilla County has 2,165.1 times the land area of nearby San Luis town (0.57 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Alamosa County, Conejos County, Huerfano County, Las Animas County within Colorado. A tract near one of these lines should be matched to the county identifier on its own records.

