According to the U.S. Fish and Wildlife Service, Montana is home to one of the largest populations of bald eagles in the lower 48 states. However, it's difficult to provide an exact number of bald eagles in Montana, as the population can vary from year to year and is affected by factors such as habitat availability, food availability, and weather conditions.
In general, bald eagles in Montana are most commonly found near large bodies of water, such as rivers and lakes, where they can find their primary food source of fish. The state conducts annual surveys to estimate the number of bald eagles, and the latest survey conducted in 2020 estimated a total of 875 breeding pairs of bald eagles in Montana.
It's worth noting that the bald eagle population in Montana and across the United States has made a significant recovery in recent decades, thanks in part to conservation efforts and the banning of the pesticide DDT, which had a significant impact on bald eagle populations in the past.