Montague is a city in Muskegon County in the U.S. state of Michigan. The population was 2,417 at the 2020 census. The city is politically indep…Montague is a city in Muskegon County in the U.S. state of Michigan. The population was 2,417 at the 2020 census. The city is politically independent from Montague Township, which borders it on three sides.