US Counties With the Highest Extreme Heat Risk

These counties carry the highest extreme heat risk in the country according to FEMA's National Risk Index. Rising summer temperatures pose serious health risks, especially for the elderly and outdoor workers. Click any county for its full hazard breakdown.

#	County	State	Heat risk	Overall
1	Cook County	Illinois	10.0	8.0
2	Harris County	Texas	10.0	8.7
3	Maricopa County	Arizona	10.0	7.2
4	Kings County	New York	10.0	7.9
5	Dallas County	Texas	10.0	7.9
6	Queens County	New York	10.0	7.8
7	Clark County	Nevada	10.0	6.5
8	Tarrant County	Texas	10.0	8.0
9	New York County	New York	10.0	7.6
10	Philadelphia County	Pennsylvania	10.0	8.1
11	Bronx County	New York	10.0	7.6
12	Pima County	Arizona	10.0	6.8
13	St. Louis County	Missouri	10.0	7.9
14	Shelby County	Tennessee	10.0	7.5
15	Kern County	California	10.0	6.8
16	Oklahoma County	Oklahoma	10.0	8.0
17	Tulsa County	Oklahoma	10.0	8.1
18	Wright County	Missouri	10.0	6.9
19	Los Angeles County	California	9.9	7.6
20	San Diego County	California	9.9	7.4
21	Miami-Dade County	Florida	9.9	7.4
22	Riverside County	California	9.9	7.1
23	San Bernardino County	California	9.9	7.2
24	Bexar County	Texas	9.9	8.0
25	Broward County	Florida	9.9	6.8
26	Santa Clara County	California	9.9	6.6
27	Wayne County	Michigan	9.9	7.6
28	Franklin County	Ohio	9.9	7.7
29	Travis County	Texas	9.9	7.8
30	Hennepin County	Minnesota	9.9	7.4
31	Marion County	Indiana	9.9	7.5
32	Milwaukee County	Wisconsin	9.9	7.1
33	Hidalgo County	Texas	9.9	8.2
34	El Paso County	Texas	9.9	7.7
35	Essex County	New Jersey	9.9	7.6
36	Montgomery County	Pennsylvania	9.9	7.5
37	Baltimore County	Maryland	9.9	8.3
38	Hamilton County	Ohio	9.9	7.7
39	Hudson County	New Jersey	9.9	7.3
40	Jackson County	Missouri	9.9	7.4
41	District of Columbia County	District of Columbia	9.9	7.8
42	Monmouth County	New Jersey	9.9	7.8
43	Johnson County	Kansas	9.9	7.2
44	Sedgwick County	Kansas	9.9	7.9
45	Richmond County	New York	9.9	7.2
46	Tulare County	California	9.9	6.6
47	Pinal County	Arizona	9.9	6.3
48	Washington County	Arkansas	9.9	7.6
49	Caddo County	Louisiana	9.9	8.1
50	Mohave County	Arizona	9.9	6.7

Source: FEMA National Risk Index. Scores normalized 1–10. City scores inherit county-level FEMA data. For informational purposes only.

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