Henderson, Nevada is 2 times larger than Santa Clarita, 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: 139 km2 calculated
Santa Clarita, officially the City of Santa Clarita, is the third largest city in Los Angeles County, California, United States and the eighteenth largest city in the state of California, based on the population estimate from the California Department of Finance. Wikipedia