Fort Worth, Texas is 7.3 times larger than Fort Collins, Colorado.
Area: 138 km2 calculated
Fort Collins is a Home Rule Municipality in and the county seat 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. Wikipedia
Area: 1,011 km2 calculated
Fort Worth is the 17th-largest city in the United States of America and the fifth-largest city in the state of Texas. Wikipedia