Portland, Oregon is 2.5 times larger than Oakland, California.
Area: 150 km2 calculated
Population: 400,740 (2012)
Oakland is a major West Coast port city in the U.S. state of California. The Port of Oakland is the busiest port for San Francisco Bay and all of Northern California. Wikipedia
Area: 376 km2 calculated
Population: 603,106 (2012)
Portland is the largest city by population in the U.S. state of Oregon, near the confluence of the Willamette and Columbia rivers. Wikipedia