At the Time of writing this Blog, their are 1890 Coins of Cryptocurrency in CoinMarketCap.
Screenshot Source CoinMarketCap.
Focus On this Screenshot or visit to website of CoinMarket, you will see at bottom of the list their are many Coins which are just listed there but they don't even have actual price as I circled in this Screenshot. Some of them has their actual price but They have unknown Supply. So with unknown Supply their Market Valume is already unknown.