While Mandarin is the official language of China, Cantonese is the dominant dialect in the Guangdong province, including Zhongshan.
It's important to note that:
* Other dialects might be spoken by smaller communities within Zhongshan, such as Hakka or Teochew.
* Mandarin is also understood and used, particularly in formal settings and for communication with people from other parts of China.
However, Cantonese remains the most widely spoken and understood language in Zhongshan.