Rent.com did its own study of cities where singles just want to have fun, not necessarily form relationships. That study was based on cities with more than 50,000 renters and those with populations greater than 100,000. Not surprisingly, those cities with lots to do made the list. San Francisco topped the list, followed  by New York, both of which have plenty to do and plenty of opportunities to meet people. One city that made both lists is Portland, Ore., which Facebook found had a high single male-to-female ratio. The Rent.com study found that there's plenty to do, particularly for those who like to be outdoors and care about the environment. The most recent Forbes analysis from May 2016 included surveys from Town and Country magazine, NerdWallet and WalletHub to (mostly) concur with Facebook and Rent.com -- Atlanta once again topped the list, followed by San Francisco and Minneapolis, which had a good balance of men to women and plenty of single people.