Highest heat-wave-risk US counties

Counties with the highest FEMA heat-wave risk — extreme heat strains the grid and drives demand outages. Ratings from FEMA's National Risk Index.

1. 1Cook County, ILVery High
2. 2Harris County, TXVery High
3. 3Maricopa County, AZVery High
4. 4Dallas County, TXVery High
5. 5Philadelphia County, PAVery High
6. 6Clark County, NVVery High
7. 7St. Louis County, MOVery High
8. 8Kings County, NYVery High
9. 9Queens County, NYVery High
10. 10Pima County, AZVery High
11. 11St. Louis city, MOVery High
12. 12Los Angeles County, CARelatively High
13. 13Riverside County, CARelatively High
14. 14San Bernardino County, CARelatively High
15. 15Orange County, CARelatively High
16. 16Alameda County, CARelatively High
17. 17Santa Clara County, CARelatively High
18. 18San Diego County, CARelatively High
19. 19King County, WARelatively High
20. 20Miami-Dade County, FLRelatively High
21. 21Contra Costa County, CARelatively High
22. 22Broward County, FLRelatively High
23. 23Bexar County, TXRelatively High
24. 24Shelby County, TNRelatively High
25. 25Fresno County, CARelatively High
26. 26Palm Beach County, FLRelatively High
27. 27Tarrant County, TXRelatively High
28. 28Hidalgo County, TXRelatively High
29. 29Wayne County, MIRelatively High
30. 30Kern County, CARelatively High
31. 31Collin County, TXRelatively High
32. 32Hillsborough County, FLRelatively High
33. 33New York County, NYRelatively High
34. 34Jefferson Parish, LARelatively High
35. 35San Joaquin County, CARelatively High
36. 36Pierce County, WARelatively High
37. 37Multnomah County, ORRelatively High
38. 38Milwaukee County, WIRelatively High
39. 39Bronx County, NYRelatively High
40. 40Hennepin County, MNRelatively High
41. 41Jefferson County, KYRelatively High
42. 42Orleans Parish, LARelatively High
43. 43Franklin County, OHRelatively High
44. 44Cuyahoga County, OHRelatively High
45. 45East Baton Rouge Parish, LARelatively High
46. 46Oklahoma County, OKRelatively High
47. 47Tulsa County, OKRelatively High
48. 48Snohomish County, WARelatively High
49. 49Bergen County, NJRelatively High
50. 50Travis County, TXRelatively High

Source: FEMA National Risk Index. Risk ratings reflect expected annual loss from the hazard, not a forecast. See each county page for its full hazard profile + a decade of outage history.