As of the census of 2000, there were 16,045 people, 5,335 households, and 3,947families residing in the city. The population density was 891.7people per square mile (344.4Square kilometers). There were 5,618housing units at an average density of 312.2per square mile (120.6Square kilometers). Ennis is in the Northeastern region of Texas. The city is 39 miles (63km) south of Dallas and 74 miles (119km) northeast of Waco, Texas. Ennis covers 18 square miles (47Square kilometers) of land and 0.4square miles (1.0Square kilometer) of water. Ennis is a city in Ellis County, Texas, United States, and a southeastern suburb of Dallas. The population was 16,045 at the 2000 census.