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Click for Google Map. Our GPS coordinates: 45deg 20' 29.50 N 111deg 42' 50.12 W. Ennis is located in southwestern Montana an hour from Bozeman to the northeast and Yellowstone National Park to the south. US Highway 287 runs through Ennis. To the north is I-90 (45 miles) and to the south is Yellowstone National Park (70 miles).
In 1872 the Houston and Central Texas Railroad (H&TC) arrived at the spot that then became Ennis. The city is named for Cornelius Ennis, an official of the railroad.Ennis served as Mayor of Houston (1856â57), and as a director of the Houston Tap and Brazoria Railway and H&TC.nnis is a city in Ellis County, Texas, United States, and a southeastern suburb of Dallas.