Cass County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 28,454. The county seat is Linden. The county was named for United States Senator Lewis Cass (D-Michigan), who favored the U.S. annexation of Texas in the mid-19th century.

Linden is a city in and the county seat of Cass County, Texas, United States. At the 2020 United States census, its population was 1,825. Linden is named after the city of Linden in Perry County, Tennessee.