How many people in China are surnamed Lou?

Donggang city in Dandong, Liaoning, Yanjin County in Xinxiang, Tongxu County in Kaifeng, Changge County in Xuchang, Yuzhou City in Xuchang, Yanling County in Xinyang City, Yuanyang County, Minggang District, Puyang City, Linying County in Luohe City, Suixian County in Shangqiu City, Yexian County in Pingdingshan City, Luohe City and yongcheng city City, Renhuai County in Zunyi City, Tongzi County and Anshun City in Guizhou Province. Ruian, Xiaoshan, Jinhua, Longquan, Taizhou, Dongyang and Shaoxing in Zhejiang Province, and Pingyin, Qixia, Xintai, Wulian, Rizhao, Tengzhou, Laizhou, Zhucheng, Linyi, Zoucheng, Zhangqiu, Rongcheng, Donge, Liaocheng and Nanjing in Jiangsu Province. Suifenhe city in Heilongjiang Province, Wansheng District in Chongqing, Jiujiang and Linchuan counties in Jiangxi Province, Jingzhou and Xiaogan cities in Hubei Province, Hefei, Tianchang, mingguang city, Sixian, Suzhou, Chuzhou and Chaohu cities in Anhui Province, Shilin District in Kunming City, Yunnan Province, Longling County in Baoshan City, Dunhua City, Hekou City and Ji 'an City in Jilin Province, Liuyang City and Loudi City in Hunan Province.