These US Cities Have the Worst Mosquito Problems This Year

As warmer temperatures spread across the U.S., mosquito season is ramping up, with some cities experiencing more pests than others.

Orkin's 2026 Mosquito Cities List reveals a significant shift in activity across the country. While Los Angeles, Chicago, and New York hold the top three spots, the broader top 50 list shows mosquito activity expanding beyond traditional hotspots and reaching more regions.

For six consecutive years, from 2015 through 2020, Atlanta topped the list. Since 2021, Los Angeles has consistently ranked No. 1, showing that what was once an issue concentrated in the Southeast has evolved into a nationwide concern, with cities across every region now facing risks.

The following rankings are based on the number of new residential mosquito treatments performed by Orkin from March 18, 2025, to March 18, 2026.

The 50 Worst Cities for Mosquitoes

1. Los Angeles
2. Chicago
3. New York
4. Detroit
5. Atlanta
6. Washington, D.C.
7. Houston
8. Dallas
9. Cleveland
10. Denver
11. Raleigh, N.C.
12. Charlotte, N.C.
13. Minneapolis
14. Philadelphia
15. Indianapolis
16. Tampa, Fla.
17. Miami
18. San Francisco
19. Orlando, Fla.
20. Columbus, Ohio
21. Greenville, S.C.
22. Baltimore
23. Milwaukee
24. Seattle
25. Nashville, Tenn.
26. Oklahoma City
27. Pittsburgh
28. Grand Rapids, Mich.
29. Norfolk, Va.
30. Cincinnati
31. Richmond, Va.
32. St. Louis
33. Flint, Mich.
34. Boston
35. Knoxville, Tenn.
36. West Palm Beach, Fla.
37. Tulsa, Okla.
38. Albuquerque, N.M.
39. Sacramento, Calif.
40. Phoenix
41. San Antonio
42. Cedar Rapids, Iowa
43. Traverse City, Mich.
44. Hartford, Conn.
45. San Diego
46. Columbia, S.C.
47. Springfield, Ill.
48. Memphis, Tenn.
49. Greenville, N.C.
50. Greensboro, N.C.

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Orkin reports that Midwestern cities continue to see some of the fastest growth year over year, with Milwaukee jumping 15 spots to No. 23 and Minneapolis climbing six spots to No. 13. At the same time, some historically high-ranking cities saw declines, with Miami and Greensboro, N.C., each dropping five spots.

Several new cities appeared on this year's list, including Traverse City, Mich., Greenville, N.C., and Springfield, Ill.

To help reduce mosquito activity, Orkin recommends using the acronym BITE to remember key prevention steps:

• Block access to skin by wearing long sleeves and pants and using repellents recommended by the Centers for Disease Control and Prevention repellents.
• Install tight-fitting screens on windows and doors.
• Trim shrubs, grass, and other vegetation to reduce mosquito resting areas.
• Eliminate standing water, which is a breeding ground for mosquitoes.