Challenge Dallas County is located in the northwest portion of Texas and covers 880 square miles. Its county seat is Dallas, which is the largest city in the county, the third-largest city in Texas, and the eighth-largest city in the United States. As of the 2010 census, the county had an official population of 2,368,139, and is the ninth most populous county in the United States. Dallas County operates the largest public defender office in

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