Havre is the county seat and largest city in Hill County, Montana, United States. Havre is nicknamed the crown jewel of the Hi-Line. It is said t…Havre is the county seat and largest city in Hill County, Montana, United States. Havre is nicknamed the crown jewel of the Hi-Line. It is said to be named after the city of Le Havre in France. As of the 2020 census the population was 9,362.