Boise, Idaho is 84% larger than Eugene, Oregon.
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: 112 km2 calculated
Eugene is a major city of the Pacific Northwest located in the State of Oregon. It is the third-largest city in the state and the county seat of Lane County. Wikipedia