Flathead Valley Population 2025. Decennial census, flathead county’s housing supply grew by 6.2% from 2010 to 2020 while the population grew by 14.8%. In this article, we'll explore the population statistics for flathead county, montana, including popular demographics data like median age, number of households, household income,.
Understand the shifts in demographic trends with these charts visualizing decades of population data. Resident population in flathead county, mt was 113.67900 thous.