Jasper County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 35,710. Its county seat is Jasper. The county was created as a municipality in Mexico in 1834, and in 1837 was organized as a county in the Republic of Texas. It is named for William Jasper, an American Revolutionary War hero.GeographyAccording to the U.S. Census Bureau, the county has a total area of, of which is land and (3.2%) is covered by water.Major highways20px U.S. Highway 6920px U.S. Highway 9625px U.S. Highway 19020px State Highway 6220px State Highway 6320px Recreational Road 255