Yongcheng (China) is 8 times larger than Lancaster, California.
Area: 256 km2 calculated
Lancaster is a charter city in northern Los Angeles County, in the Antelope Valley of the western Mojave Desert in Southern California. Lancaster currently ranks as the 30th largest city in California, and the 148th largest city in the United States. Wikipedia
Area: 2,053 km2 calculated
Yongcheng is a county-level city in Shangqiu, Henan, in the People's Republic of China. It is the former site of Shiyuan, the capital of Han-era Liang. It includes the excavated mausoleum of the fabulously wealthy Liu Wu, prince of Liang, now a museum famed for its murals. Wikipedia