Geography thumb|right|Uptown Dallas with Downtown Dallas on the end thumb|Named after a Dallas philanthropist, the Margaret Hunt Hill Bridge spans the Trinity River. Dallas is situated in the Southern United States, in North Texas. It is the county seat of Dallas County and portions of the city extend into neighboring Collin, Denton, Kaufman, and Rockwall counties. Many suburbs surround Dallas; three enclaves are within the city boundaries—Cockrell Hill, Highland Park, and University Park. According to the United States Census Bureau, the city has a total area of ; of Dallas is land and of it (11.75%) is water. Dallas makes up one-fifth of the much larger urbanized area known as the Dallas–Fort Worth metroplex, in which one quarter of all Texans live.
geography thumb|right|uptown dallas with downtown dallas on the end thumb|named after a dallas philanthropist the margaret hunt hill bridge spans the trinity river dallas is situated in the southern united states in north texas it is the county seat of dallas county and portions of the city extend into neighboring collin denton kaufman and rockwall counties many suburbs surround dallas; three enclaves are within the city boundaries—cockrell hill highland park and university park according to the united states census bureau the city has a total area of ; of dallas is land and of it (1175%) is water dallas makes up one-fifth of the much larger urbanized area known as the dallas–fort worth metroplex in which one quarter of all texans live