- The name derived from Mumba or Maha-Amba (Koli goddess Mumbadevi) and Aai ("mother" in the language of Marathi, The mother tongue of the Kolis).
- Built on what was once an archipelago of seven islands: Bombay Island, Parel, Mazagaon, Mahim, Colaba, Worli, and Old Woman's Island (also known as Little Colaba).
- The wealthiest city in India, and has highest GDP of any city in South, West or Central Asia.
- Located on the western coast of India, 2nd most populous metropolitan area in India, and 5th most populous city in the world.
- Having a population of 20.7 million (census 2011), it is one of the most populous urban regions in the world.
- The city also houses India's Hindi (Bollywood) and Marathi film and television industry.
- It is home to some of India's premier scientific and nuclear institutes like BARC, NPCL, IREL, TIFR, AERB, AECI, and the Department of Atomic Energy.
- The city houses important financial institutions such as the Reserve Bank of India, the Bombay Stock Exchange, the National Stock Exchange of India, the SEBI and the corporate headquarters of numerous Indian & MNCs.
- Ranked 6th among top ten global cities on billionaire count, 48th on the Worldwide Centres of Commerce Index 2008, 7th in the list of "Top Ten Cities for Billionaires" by Forbes magazine.
- India’s FINANCIAL, COMMERCIAL AND ENTERTAINMENT CAPITAL, generating 5% of India's GDP and accounting for 25% of industrial output, 70% of maritime trade in India (Mumbai Port Trust & JNPT), and 70% of capital transactions to India's economy.
- India's largest city (by population), serves as an economic hub of India, contributing 10% of factory employment, 25% of industrial output, 33% of income tax collections, 60% of customs duty collections, 20% of central excise tax collections, 40% of India's foreign trade and INR4000 crore (US$650 million) in corporate taxes.
