If it seems like there's a fascination with bed bugs, well, there's a reason. They'd been pretty much vanquished from the sheets of most homes until recently. And now, we have not one but two companies tracking their movements: Orkin and Terminix, both exterminators.

So, for the third year in a row, Baltimore topped Orkin’s Top 50 Bed Bug Cities list, released today. New York moved up two spots, while Atlanta and Philadelphia joined the top 10, replacing San Francisco and Dallas, respectively.

Just last month, Terminix named Washington D.C. the capital for bed bugs, but its survey was based on states and the district.

In the Orkin report, five cities moved into the top 50 this year, including Lansing, Mich., Orlando, Fla., Davenport, Iowa, Ft. Wayne, Ind. and Youngstown, Ohio. Houston dropped nine positions, while Greenville, S.C., rose seven positions, entering the top 20.

The list is based on treatment data from the metro areas where Orkin performed the most bed bug treatments from December 1, 2017 – November 30, 2018. The ranking includes both residential and commercial treatments.

1. Baltimore2. Washington, D.C.
3. Chicago
4. Los Angeles
5. Columbus, Ohio
6. New York (+2)
7. Cincinnati (-1)
8. Detroit (-1)
9. Atlanta (+4)
10. Philadelphia (+2)
11. Cleveland-Akron (+3)
12. San Francisco (-3)
13. Raleigh-Durham, N.C. (+2)
14. Indianapolis (-3)
15. Dallas (-5)
16. Norfolk, Va. (+2)
17. Richmond, Va. (-1)
18. Greenville, S.C. (+7)
19. Charlotte, N.C.
20. Grand Rapids, Mich. (+3)
21. Buffalo, N.Y. (-1)
22. Knoxville, Tenn. (-1)
23. Nashville, Tenn. (-1)
24. Champaign, Ill. (+2)
25. Pittsburg (-1)
26. Houston (-9)
27. Denver (+1)
28. Milwaukee (+1)
29. Miami (+8)
30. St. Louis (+5)
31. Charleston, W.Va.
32. Lansing, Mich. (new to list)
33. Syracuse, N.Y.
34. Phoenix (-7)
35. Tampa, Fla. (+14)
36. Greensboro, N.C. (+10)
37. Omaha, Neb. (+2)
38. Boston (-6)
39. Seattle (-3)
40. Las Vegas (+5)
41. Orlando, Fla. (new to list)
42. Davenport, Iowa (new to list)
43. Hartford, Conn. (-13)
44. Cedar Rapids, Iowa (-4)
45. Dayton, Ohio (-11)
46. Honolulu (-3)
47. Flint, Mich. (-9)
48. Ft. Wayne, Ind. (new to list)
49. San Diego (-8)
50. Youngstown, Ohio (new to list)

“Bed bugs are the number one urban pest in many cities today,” said Chelle Hartzer, an Orkin entomologist. “They are master hitchhikers, so no one is immune. Sanitation has nothing to do with prevention: from public transit to five-star resorts, bed bugs have been and can be found everywhere humans are.”