Singapore

Almost six million people live in Singapore, which gives eight thousand people per square kilometer.

An excerpt from the article 33 facts about Singapore
Singapore is a mixture of cultures – 75% are Chinese, 14% Malays, 8% Indians, many Europeans and Americans. The New Year is celebrated four times a year. There is a diversity of religions, and there are four official languages: Mandarin, English, Malay, and Tamil.