Dayton, Ohio is 2.6 times larger than Sunnyvale, California.
Area: 149 km2 calculated
Dayton is the sixth largest city in the U.S. state of Ohio and is the county seat of Montgomery County. Wikipedia
Area: 57 km2 calculated
Sunnyvale, officially the City of Sunnyvale, is a city located in Santa Clara County, California. As of the 2010 United States Census, the population was 140,095. The city is one of the major cities that make up the Silicon Valley located in the San Francisco Bay Area. Wikipedia