The seat of Harrison County, Marshall is located just east of Longview on US 59.
Marshall is part of the Longview-Marshall, Texas metro area.
The citizens of Marshall have shown notable interest in preserving their city's past. The old courthouse on the square has housed a local museum since 1965. By 1983, fifteen homes and buildings were listed in the National Register for Historic Places, and scores of historical landmark medallions had been awarded in the city by the Texas Historical Commission. In 1976 the National Municipal League designated Marshall an All American City, one of the ten cities in the United States to receive this recognition.
The population was 24,921 in 1980 and 23,682 in 1990.