According to rankings on Monday from WalletHub. San Diego is ranked the sixth-best large city to live in. 62 cities were ranked with over 300,000 people based on several factors which include education systems, economy, livability & health. Sub-categories included diversity, traffic, affordability, while health took account of air & water quality, crime rates & life expectancy. San Diego's school system tied for first, along with Austin, Raleigh, Honolulu and Lexington, Kentucky. The rankings only applied to actual city boundaries and did not evaluate surrounding metro areas.