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Ennis is a city in Ellis County, Texas, United States, and a southeastern suburb of Dallas.The population was 18,513 at the 2010 census.nnis is a city in Ellis County, Texas, United States, and a southeastern suburb of Dallas.
Compare Ennis, TX Demographics To Other Cities. Ennis population breakdown by race. In Ennis, 36.8% of people are of Hispanic or Latino origin. Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.