Henderson, Nevada is 6.8 times larger than West Covina, California.
Area: 283 km2 calculated
Henderson, officially the City of Henderson, is a city in Clark County, Nevada. It is the second largest city in Nevada, after Las Vegas, with an estimated population of 265,679 in 2012. The city is part of the Las Vegas metropolitan area, which spans the entire Las Vegas Valley. Wikipedia
Area: 42 km2 calculated
West Covina is a city in Los Angeles County, California, located 19 miles east of Downtown Los Angeles in the eastern San Gabriel Valley and is part of Greater Los Angeles. The population for the city was 106,098 at the 2010 census. Wikipedia