Mumbai is one of the most populous cities in the world. As of the last official census in 2011, the city proper held approximately 12.5 million residents, with the Greater Mumbai Metropolitan Region (MMR) exceeding 20 million. It boasts a staggering population density of roughly 21,000 people per square kilometer.
The city is a melting pot of ethnicities, cultures, and religions. While Maharashtrians form the largest demographic, there are massive populations of Gujaratis, North Indians, South Indians, and Bengalis. Hinduism is the majority religion, followed by significant populations practicing Islam, Buddhism, Jainism, Christianity, Sikhism, and Zoroastrianism (the Parsi community). Marathi is the official language, though Hindi and English serve as the primary lingua francas for commerce and daily interaction.