There is no town by the name of Montana in South Dakota. Montana and South Dakota are separate states in the USA. Each of them occupies a wide range of both latitude and longitude.
The longitude of Montana ranges from about 104°W to 116°W.
Latitude: 45°59′56″NLongitude: 112°31′27″W
Montana
Montana
The center of the intersection of Tainter St and Oak Ave in St. Helena, California, at the northeast corner of the St. Helena Catholic Church, is located at 38.50373° north latitude 122.46981° west longitude. Other spots around town have different coordinates.
It is in the north of the USA. The longitude: N2345 S4563 latitude is : W1234 E4512
Eastern Montana, between Fallon and Glendive.
Montana
That point is located about 2.35 miles northwest of the small town of Pompey's Pillar, along I-94 in southern Montana.
Latitude: 46°35′44.9″NLongitude: 112°1′37.31″W
That point is on the Wyoming/Montana line, about 3.3 miles south-southeast of Ridge, Montana.