Geography of Marion County
Marion County sits at roughly 32.80° N and 94.36° W in the East Texas region of Texas, spanning 381 square miles of terrain that includes the landscape characteristic of the area — from open ranchland and farmland to small-town main streets. The county's centroid is near Jefferson, and the county shares boundaries with 4 neighboring counties.
Population & demographics
With approximately 9,896 residents across 381 square miles, Marion County has a population density of about 26.0 people per square mile. Like much of West and South Texas, the county is sparsely populated, with wide-open country between settlements.
County seat: Jefferson
Jefferson serves as the seat of government for Marion County. The county courthouse, commissioners court, district clerk, and primary public records are located here. As with all 254 Texas counties, the county seat is the anchor of civic life and the principal address for elections, permits, and court filings.
History & name origin
Marion County was established in 1860 and was named for Francis Marion (1732–1795), American Revolutionary War general. It was carved from territory previously part of Cass County.
Marion County, Texas — frequently asked questions
Quick answers about Marion County geography, population, county seat, neighboring counties, and how to use the maps on this page. Every answer is generated from the official U.S. Census data backing this site.
Where is Marion County, Texas located?+
Marion County is located in the East Texas region of Texas at approximately 32.798° N, 94.357° W. It is one of the 254 counties of Texas and carries U.S. Census FIPS code 48315. The interactive map on this page renders the official U.S. Census TIGER boundary for Marion County over real-world OpenStreetMap, Esri satellite, and topographic basemaps.
How big is Marion County in square miles?+
Marion County covers approximately 381 square miles of land in the East Texas region — a compact county by Texas standards. By land area it ranks 244th out of 254 Texas counties. The full bounding box of the county is rendered to scale on the interactive map and matches the U.S. Census TIGER 2023 polygon.
What is the population of Marion County, Texas?+
Marion County has a population of approximately 9,896 residents. With 381 square miles of land, that works out to a population density of about 26.0 people per square mile, which is rural for a Texas county. That makes Marion County the 164th most populous of the 254 counties in Texas.
What is the county seat of Marion County?+
Jefferson is the county seat of Marion County, Texas, which was organized in 1860 and named for Francis Marion (1732–1795), American Revolutionary War general. Marion County was originally carved out of Cass County. County government offices, courthouses, and most public records for Marion County are located in Jefferson.
Which Texas counties border Marion County?+
Marion County shares borders with Harrison, Morris, Cass, and Upshur counties. These 4 neighboring counties are highlighted on the schematic boundary map and linked at the bottom of this page so you can quickly compare population, area, and county seats across the East Texas region.
Where can I download or print a map of Marion County?+
A free, print-ready PDF map of Marion County is available from the "Download PDF" button at the top of this page. The printable layout uses authentic U.S. Census TIGER boundary geometry for Marion County, includes a Texas locator inset, and is sized for standard 8.5" × 11" Letter paper. For interactive use, the live Leaflet map on this page supports OpenStreetMap, Esri satellite, Esri topographic, and Carto light basemaps with zoom, scale bar, and fullscreen.
What is the FIPS code for Marion County, Texas?+
The full 5-digit U.S. Census FIPS code for Marion County is 48315, made up of Texas state code 48 and the 3-digit county code 315. This is the same FIPS code used by the U.S. Census Bureau TIGER/Line files, the American Community Survey, and most federal datasets that key on county.