Fontana, California is 45% larger than Orange, California.
Area: 106 km2 calculated
Fontana is a city of 200,762 residents in San Bernardino County, California. Founded by Azariel Blanchard Miller in 1913, it remained essentially rural until World War II, when entrepreneur Henry J. Kaiser built a large steel mill in the area. Wikipedia
Area: 73 km2 calculated
The city of Orange is located in Orange County, California. It is approximately 3 miles north of the county seat, Santa Ana. Orange is unusual in that many of the homes in its Old Town District were built prior to 1920. Wikipedia