Cook County, Illinois vs. Orange County, California: Comparea Area Comparison

Area: 2,468 km² calculated

Population: 5,231,351 (2012)

Cook County is a county in the United States state of Illinois. As of the 2010 census, the population was 5,194,675. Wikipedia

Area: 2,064 km² calculated

Population: 3,090,132 (2012)

Orange County is a county in the U.S. state of California. As of the 2010 census, the population was 3,010,232 making it the third-most populous county in California, the sixth-most populous in the United States, and it more populous than twenty-one U.S. states. Its county seat is Santa Ana. Wikipedia