THE MARION COUNTY LAND BRIEF
Land in the
Tertiary Uplands setting.
Marion County has 380.9 square miles of land in Texas. 2 mapped landscape regions meet across Marion County: Tertiary Uplands, Floodplains and Low Terraces.
The Piney Woods occupy irregular plains at the western edge of the southern forest belt. Pine and hardwood landscapes alternate with wider river corridors such as the Red River valley.
Regional context: South Central Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Marion County intersects 2 mapped regional units. The largest mapped shares are:
- Tertiary Uplands86.6%
- Floodplains and Low Terraces13.4%
Finding your parcel within Marion County
The atlas lists 2 cities, towns, townships, and Census communities associated with Marion County, including Jefferson, Pine Harbor. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Marion County by land and water
The Census records 39.4 square miles of water within Marion County, or 9.4% of its total area. That share is close to Marion County’s 9.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Marion County has 85.6 times the land area of nearby Jefferson city (4.45 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Cass County, Harrison County, Morris County, Upshur County within Texas. A tract near one of these lines should be matched to the county identifier on its own records.

