As of 2015, top sites offering the best ad listings for private car sales include Cars.com and AutoTrader.com. Both sites make it easy to either search for a car to buy or list a car for sale. Craigslist is also popular for searching and listing in specific cities.
Some private car sales listing sites require a payment upfront to list an ad. Craigslist offers free listings in local areas but does come with some risks associated with buyer and seller trustworthiness. It is common to run into scams on Craigslist, but many postings are legitimate and safe. Users commonly consider AutoTrader and Cars.com to be more trustworthy for car sales than Craigslist postings.