Orange County, Florida is 31% larger than Jacksonville, Florida.
Area: 1,988 km2 calculated
Jacksonville is the largest city in the U.S. state of Florida by population and the largest city by area in the contiguous United States. It is the county seat of Duval County, with which the city government consolidated in 1968. Wikipedia
Area: 2,599 km2 calculated
Orange County is a county located in the State of Florida. As of the 2010 census, the population was 1,145,956, making it the fifth-most populous county in Florida. The county seat is Orlando. Orange County is included in the Orlando-Kissimmee-Sanford, FL Metropolitan Statistical Area. Wikipedia