At a Glance

Beijing:
Population: 17,430,000
Size: 16,801.25 square km
Language: Mandarin
People: Han Chinese, Manchu, Hui
Religion: Atheist, Confucianism, Buddhist, Taoism, Muslim, Christian
Time: Greenwich Mean Time plus eight hours. When it's noon in New York, it's midnight in Beijing. The whole country is standardized to Beijing time.
Currency: Currency is the yuan in mainland China and the Hong Kong dollar in Hong Kong. Banking hours are often irregular, but the general rule is 8-11:30am, and 2-4:30pm, open daily.
Electricity: 220 volts, plugs are generally flat two-prongs.

Xi’an:
Population: 2,670,000
Size: 9,983 square km
Language: Mandarin
People: Han Chinese, Manchu, Hui
Religion: Buddhism, Daojiao, Roman Catholic, Muslim
Time: Greenwich Mean Time plus eight hours. When it's noon in New York, it's midnight in Beijing. The whole country is standardized to Beijing time.
Currency: Currency is the yuan in mainland China and the Hong Kong dollar in Hong Kong. Banking hours are often irregular, but the general rule is 8-11:30am, and 2-4:30pm, open daily.
Electricity: 220 volts, plugs are generally flat two-prongs.

Shanghai:
Population: 18,670,000
Size: 7,037.50 square km
Language: Mandarin
People: Han Chinese, Manchu, Hui
Religion: Buddhism, Taoism, Muslim, Christian
Time: Greenwich Mean Time plus eight hours. When it's noon in New York, it's midnight in Beijing. The whole country is standardized to Beijing time.
Currency: Currency is the yuan in mainland China and the Hong Kong dollar in Hong Kong. Banking hours are often irregular, but the general rule is 8-11:30am, and 2-4:30pm, open daily.
Electricity: 220 volts, plugs are generally flat two-prongs.

Guilin:
Population: 1.34 million
Language: Mandarin
People: Zhuang, Yao, Hui, Miao, Han, Dong
Religion: Buddhism, Muslim, Christian
Time: Greenwich Mean Time plus eight hours. When it's noon in New York, it's midnight in Beijing. The whole country is standardized to Beijing time.
Currency: Currency is the yuan in mainland China and the Hong Kong dollar in Hong Kong. Banking hours are often irregular, but the general rule is 8-11:30am, and 2-4:30pm, open daily.
Electricity: 220 volts, plugs are generally flat two-prongs.

Hong Kong:
Population: 6,921,700
Size: 1,104 square km
Language: Cantonese, English
People: Cantonese
Religion: Buddhism, Christian, Taoism, Mormon, Jewish
Time: Greenwich Mean Time plus eight hours. When it's noon in New York, it's midnight in Beijing. The whole country is standardized to Beijing time.
Currency: Currency is the yuan in mainland China and the Hong Kong dollar in Hong Kong. Banking hours are often irregular, but the general rule is 8-11:30am, and 2-4:30pm, open daily.
Electricity: 220 volts, plugs are generally flat two-prongs.