Los Angeles County, California is 4.1 times larger than Orange County, Florida.
Area: 10,580 km2 calculated
Los Angeles County, also known as L.A. County, officially the County of Los Angeles, is a county in the U.S. state of California. As of the 2010 U.S. Census, the county has a population of 9,818,605, making it the most populous county in the United States. 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