what county is longview texas
LONGVIEW, TX (GREGG COUNTY) LONGVIEW, TEXAS (Gregg County). Longview, the county seat of Gregg County, is on Interstate Highway 20 and U.S. highways 80 and 259, about 125 miles east of Dallas in eastern Gregg and western Harrison counties. In the early 1990s it was the largest city in Gregg County.