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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).
Homefacts City Report. Ennis is located in Madison County, MT. The population is 883, making Ennis the largest city in Madison County. There are 3 public schools in Ennis with an average Homefacts rating of A. The total crime rate for Ennis is very low, and there are 4 registered sex offenders residing in the city.