Dallas is the county seat of Dallas County. Portions of the city extend into neighboring Collin, Denton, Kaufman, and Rockwall counties. According to the United States Census Bureau, the city has a total area of 385 square miles (997.1 km2), 342.5 square miles (887.1 km2) of it being land and 42.5 square miles (110.1 km2) of it (11.03%) 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.
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