(KTLA/NEXSTAR) – It’s their world. We just live in it.

Orkin has released its 2023 list of the “rattiest cities” in the U.S., which ranks 50 of the nation’s busiest metro regions by “the number of new rodent treatments” performed over a period of 12 months. Specifically, Orkin studied new rodent treatments executed between Sept. 1, 2022, and Aug. 31, 2023, at both residential and commercial properties.

Perhaps not surprisingly, Chicago was ranked as the No. 1 “rattiest” city for a ninth consecutive year. Another Illinois city, Champaign, also made the top 50 ranks at No. 41. However, it is an improvement from placing 33rd last year.

Rounding out the top five “rattiest” cities were Los Angeles, New York, Washington D.C. and San Francisco — the usual suspects, as Orkin’s previous reports have suggested.

A complete list of the 50 “rattiest” cities can be found below:

  1. Chicago
  2. Los Angeles
  3. New York
  4. Washington, D.C.
  5. San Francisco
  6. Philadelphia
  7. Baltimore
  8. Denver
  9. Detroit
  10. Cleveland-Akron
  11. Minneapolis-St. Paul
  12. Seattle
  13. Boston
  14. Atlanta
  15. Indianapolis
  16. Pittsburgh
  17. Hartford, Connecticut
  18. Columbus, Ohio
  19. Miami-Ft. Lauderdale
  20. Houston
  21. Charlotte
  22. Dallas-Ft. Worth
  23. Raleigh-Durham
  24. Milwaukee
  25. Grand Rapids
  26. Portland, Oregon
  27. Norfolk-Portsmouth, Virginia
  28. San Diego
  29. Richmond-Petersburg, Virginia
  30. New Orleans
  31. Cincinnati
  32. Greenville-Spartanburg, South Carolina
  33. Sacramento
  34. Kansas City
  35. Nashville
  36. Tampa-St. Pete
  37. Orlando-Daytona Beach
  38. Buffalo
  39. St. Louis
  40. Phoenix
  41. Champaign, Illinois
  42. Albany-Troy, New York
  43. Flint, Michigan
  44. Burlington, Vermont-Plattsburgh, New York
  45. Albuquerque, New Mexico
  46. Rochester, New York
  47. South Bend, Indiana
  48. Syracuse, New York
  49. Charleston-Huntington, West Virginia
  50. Greensboro, North Carolina

Orkin added that fall and winter — specifically October through February — are when rodents most often make their way into residences, with an estimated 21 million seeking food and shelter during the colder months

“Rodents multiply swiftly and when an infestation is left unattended, they can cause extensive damage to homes and yards,” Ben Hottel, an Orkin entomologist, said in a news release announcing the 2023 list. “Rats are capable of squeezing into spaces through holes as small as a quarter, which makes it especially important to seal cracks from the outside.”

Rats can also carry diseases including hantavirus, leptospirosis and even monkeypox, according to the CDC.

To prevent rat infestation in your home, Orkin recommends keeping food sealed and stored, removing clutter — especially cardboard, which they chew and use for their nests — maintaining the landscaping around your home, and inspecting for rodents frequently.

On the other hand, for those looking to celebrate their “rattiest city” title as they would a sports championship, Orkin has taken the liberty of designing a colorful T-shirt to specifically celebrate Chicago’s unparalleled run at the top of the rankings.