El Paso, Texas is 3.4 times larger than Boise, Idaho.
Area: 207 km2 calculated
Boise is the capital and most populous city of the U.S. state of Idaho, as well as the county seat of Ada County. Located on the Boise River in southwestern Idaho, the population of Boise at the 2010 Census was 205,671, the 99th largest in the nation. Its estimated population in 2013 was 214,237. Wikipedia
Area: 701 km2 calculated
El Paso is the county seat of El Paso County, Texas, United States, and lies in far West Texas. As of July 1, 2013, the population estimate from the U.S. Census was 674,433, making it the 19th most populous city in the United States. Its U.S. Wikipedia