"The reported rat rate increased from fewer than 10 rats per 1,000 residents in 2002 to 60 per 1,000 in 2009, according to Baltimore CitiStat.
A Baltimore City Health Department report that year noted that “the rodent infestation rate in Baltimore is six times the national average.” More recently, 19,869 residents called the city’s 311 number to complain about rats between Jan. 1, 2010, and April 4, 2013, with a slight bump from 7,579 in 2011 to 8,436 in 2012. (This compares to the District’s 311 calls regarding rodents, which rose from 2,820 in 2011 to 3,010 in 2012.) Personally, I’ve called Baltimore’s 311 number for rodent control once when my chubby, not-the-brightest-bulb dog started catching and killing the brazen creatures in my yard one summer; since then, dozens and dozens of rats have darted by, and I haven’t bothered calling."
https://www.washingtonpost.com/lifestyle/magazine/oh-rats-theres-one-aspect-of-baltimore-she-cant-get-used-to/2013/06/19/96cd18ca-c96f-11e2-9245-773c0123c027_story.html?utm_term=.74d4a44441f3 Turns our Baltimore is rat infested