what counties is dallas in
DALLAS COUNTY. Dallas County, in north central Texas, is bordered by Kaufman and Rockwall counties to the east, Tarrant County to the west, Denton and Collin counties to the north, and Ellis County to the south. Dallas is the county seat and largest city. The county's center point is at 32Â°46' north latitude and 96Â°48' west longitude. Dallas County comprises 902 square miles of the primarily flat, heavy Blackland Prairie. Elevations in the county range from 382 to 850 feet above sea level. The Elm Fork and West Fork of the Trinity River meet near downtown Dallas. The county is drained by the Trinity River and its tributaries, including White Rock, Mountain, Fivemile, Tenmile, Muddy, Duck, Turtle, and Mesquite creeks.