The pest control company released this year's list of cities and Chicago is at the top for the third year in a row.
The rankings are based on the number of treatments performed by Orkin from Sept. 15, 2016-Sept. 15, 2017.
Mayor Rahm Emanuel's budget for next year includes adding more city crews and an extra half a million dollars to get rid of the rats.
Full list of rattiest cities in U.S.:
1. Chicago
2. New York
3. Los Angeles
4. San Francisco - Oakland
5. Washington, DC
6. Philadelphia
7. Detroit
8. Baltimore
9. Seattle - Tacoma
10. Dallas - Ft. Worth
11. Denver
12. Minneapolis - St. Paul
13. Cleveland - Akron
14. Atlanta
15. Boston
16. Hartford - New Haven
17. Portland, OR
18. Miami - Ft. Lauderdale
19. Indianapolis
20. Houston
21. Milwaukee
22. Pittsburgh
23. New Orleans
24. Cincinnati
25. Richmond - Petersburg
26. Sacramento - Stockton
27. Kansas City
28. Charlotte
29. Norfolk - Portsmouth - Newport News
30. Buffalo
31. Columbus, OH
32. St. Louis
33. Raleigh - Durham
34. Grand Rapids - Kalamazoo
35. San Diego
36. Albany - Schenectady
37. San Antonio
38. Tampa - St. Petersburg
39. Rochester, NY
40. Nashville
41. Champaign - Springfield - Decatur
42. Greenville - Spartanburg
43. Memphis
44. Phoenix
45. Syracuse
46. West Palm Beach
47. Orlando - Daytona Beach
48. Madison
49. Flint - Saginaw
50. Green Bay - Appleton