Portland, Oregon is 3.4 times larger than Simi Valley, California.
Area: 376 km2 calculated
Portland is the largest city by population in the U.S. state of Oregon, near the confluence of the Willamette and Columbia rivers. Wikipedia
Area: 112 km2 calculated
Simi Valley is a city located in the valley of the same name, Simi Valley, in the southeast corner of Ventura County, California, United States. Situated 30 miles from Downtown Los Angeles, Simi Valley is part of the Greater Los Angeles Area. Wikipedia