BALTIMORE, MD – Charm City is once again among America's "Rattiest Cities," according to a new report from pest control company Orkin, although it has shown progress in each of the past two years. Baltimore comes in at No. 9 on the company's 2018 rankings released Monday.

This is the fourth year that Orkin has compiled the rankings, which are based on the number of rodent treatments the company performed from Sept. 15, 2017 to Sept. 15, 2018. It includes both residential and commercial treatments. Baltimore dropped one slot from last year, when it was ranked eighth; two years ago it was No. 6 on the Orkin list. The city has undertaken several rat control measures, including the issuance of municipal garbage cans to contain waste.

For the fourth year in a row, Chicago was No. 1 on the list. Here are the 10 "Rattiest Cities" in the U.S. for 2018, according to Orkin:

Chicago Los Angeles New York Washington, DC San Francisco Detroit Philadelphia Cleveland Baltimore Denver See the full list of "rattiest cities" here. Those concerned about rat infestations should call Baltimore City at 311 or submit an online service request.



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As the weather turns cold, rodents seek shelter in warm areas with readily-available food and water. The National Pest Management Association estimates rodents enter an estimated 21 million homes in the U.S. each winter.

"Rodents don't need much of an invitation to enter your home," said Chelle Hartzer, an Orkin entomologist, in a news release. "A rat can squeeze through an opening as small as a quarter, while a mouse can wedge its way into a hole smaller than a dime." Rats and mice will chew through electrical wires, gas lines and support beams in buildings. It's estimated 25 percent of unexplained fires start from rodent chewing.