Philadelphia has more mouse sightings per housing unit than any other U.S. city, according to an analysis by Bloomberg of the 2013 Census Bureau American Housing Survey. 

Almost one in five housing units in the city had evidence of mice in the 12 months previous to the survey. Boston and Baltimore occupy the second and third place respectively.

When it comes to roaches, less than 10 percent oh housing units in Philadelphia had evidence of these insects. In this category, Tampa takes the first place, followed by Houston, Miami and Orlando.