Fort Collins is the Home Rule Municipality that is the county seat and the most populous municipality of Larimer County, Colorado, United States. Situated on the Cache La Poudre River along the Colorado Front Range, Fort Collins is located 65 miles north of the Colorado State Capitol in Denver. With a 2016 estimated population of 161,000, it is the fourth most populous city in Colorado after Denver, Colorado Springs, and Aurora. Fort Collins is a midsize college city, home to Colorado State University.