Harris County, Texas is 19 times larger than Denton, Texas.
Area: 247 km2 calculated
Denton is a city in the U.S. state of Texas and the county seat of Denton County. As of the 2010 United States Census, its population was 113,383, making it the 27th most populous city in Texas and the 11th-largest city in the Dallas–Fort Worth metroplex. Wikipedia
Area: 4,589 km2 calculated
Harris County is a county in the U.S. state of Texas. As of the 2010 census, the population was 4,092,459, making it the most populous county in Texas and the third-most populous in the United States. Wikipedia