Chicago has long been known as the Windy City, but it has another nickname it would probably prefer not to have — the rattiest city. According to national pest control company Orkin, Chicago has more rats than any other city in the country. The ranking is based on the amount of residential and commercial rat and mice treatments it performed over the past 12 months. New York came in second place, followed by Washington, DC, Los Angeles, and the San Francisco Bay Area. Of the 50 cities that were ranked, Salt Lake City was found to have the least rodent activity.