Harlowton is a city in and the
county seat of
Wheatland County,
Montana,
United States. The population was 997 at the
2010 census. The city was once the eastern terminus of electric operations (1914–74) of the
Milwaukee Road railroad's "Pacific Extension" route, which went all the way to
Avery, Idaho. Here, steam or diesel locomotives were changed or hooked up to electric locomotives. Harlowton was founded in 1900 as a station stop on the
Montana Railroad, a predecessor to the Milwaukee, and was named for Richard A. Harlow, the Montana Railroad's president.