The city, along with its Arkansas counterpart forms the core of the Texarkana, Texas–Texarkana, Arkansas Metropolitan Statistical Area, encompassing all of Bowie County, Texas and Miller County, Arkansas.

Texarkana, Texas, is located at the junction of Interstate 30 and US highways 59, 67, 71, and 82 in extreme northeast Texas on the Texas-Arkansas border, at 33°26′14″N 94°4′3″W / 33.43722°N 94.0675°W / 33.43722; -94.0675 (33.437170, -94.067394). It is in the Central time zone.

According to the United States Census Bureau, the city has a total area of 25.7 square miles (66.6 km²), of which, 25.6 square miles (66.4 km²) of it is land and 0.1 square miles (0.3 km²) of it (0.39%) is water.

As of the census of 2000, there were 34,782 people, 13,569 households, and 8,941 families residing in the city. The population density was 1,357.3 people per square mile (524.0/km²). There were 15,105 housing units at an average density of 589.4/sq mi (227.5/km²). The racial makeup of the city was 59.18% White, 37.05% African American, 0.34% Native American, 0.73% Asian, 0.05% Pacific Islander, 1.43% from other races and 1.22% from two or more races. Hispanic or Latino of any race were 2.91% of the population.

There were 13,569 households out of which 31.5% had children under the age of 18 living with them, 42.5% were married couples living together, 19.3% have a female householder with no husband present and 34.1% were non-families. 29.9% of all households were made up of individuals and 12.1% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 3.01.

In the city the population was spread out with 26.0% under the age of 18, 10.0% from 18 to 24, 27.6% from 25 to 44, 20.7% from 45 to 64, and 15.7% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 89.0 males. For every 100 females age 18 and over, there were 84.4 males.

The median income for a household in the city was $29,727, and the median income for a family was $38,505. Males had a median income of $34,155 versus $21,143 for females. The per capita income for the city was $17,815. About 19.4% of families and 24.0% of the population were below the poverty line, including 34.8% of those under age 18 and 13.2% of those age 65 or over.

The Texas Department of Criminal Justice (TDCJ) operates the Texarkana District Parole Office in Texarkana.

The Texas Sixth Court of Appeals is located in the Bi-State Justice Building.

The United States Postal Service operates the Texarkana Post Office in Texarkana, Texas. In addition it operates the Downtown Texarkana Post Office in Texarkana, Arkansas.