Avinger is a town in Cass County, in the U.S. state of Texas. The population was 444 at the 2010 census.
State Representative David Simpson, a Republican from Longview, served from 1993 to 1998 as the mayor of Avinger.
The town was established in 1876.
Avinger is located in southwestern Cass County at 32°53′54″N 94°33′16″W (32.898288, -94.554464). Texas State Highway 49 passes through the town center, leading northwest 9 miles (14 km) to Hughes Springs and southeast 16 miles (26 km) to Jefferson. Texas State Highway 155 crosses Highway 49 southeast of the town center and leads northeast 14 miles (23 km) to Linden, the Cass County seat, and southwest 27 miles (43 km) to Gilmer.
According to the United States Census Bureau, Avinger has a total area of 2.0 square miles (5.1 km2), of which 0.01 square miles (0.03 km2), or 0.56%, is water.
As of the census of 2000, there were 464 people, 203 households, and 132 families residing in the town. The population density was 248.2 people per square mile (95.8/km2). There were 236 housing units at an average density of 126.3 per square mile (48.7/km2). The racial makeup of the town was 75.43% White, 22.63% African American, 0.43% from other races, and 1.51% from two or more races. Hispanic or Latino of any race were 1.94% of the population.