THE DALLAS COUNTY LAND BRIEF
Land in the
Northern Blackland Prairie setting.
Dallas County has 873.2 square miles of land in Texas. 2 mapped landscape regions meet across Dallas County: Northern Blackland Prairie, Floodplains and Low Terraces.
Fine-textured clay soils distinguish the Blackland Prairie landscape from surrounding Texas regions. Its historic prairie setting now includes a mixture of agricultural areas and expanding developed corridors.
Regional context: Texas Blackland Prairies ↗ · Regional mapping across the county footprint
Where the landscape changes
Dallas County intersects 2 mapped regional units. The largest mapped shares are:
- Northern Blackland Prairie93.9%
- Floodplains and Low Terraces6.1%
Finding your parcel within Dallas County
The atlas lists 32 cities, towns, townships, and Census communities associated with Dallas County, including Dallas, Grand Prairie, Irving. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Dallas County by land and water
The Census records 35.5 square miles of water within Dallas County, or 3.9% of its total area. That share is close to Dallas County’s 3.9%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Dallas County has 2.6 times the land area of nearby Dallas city (339.7 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Collin County, Denton County, Ellis County, Kaufman County, Rockwall County, Tarrant County within Texas. A tract near one of these lines should be matched to the county identifier on its own records.

