Top counties by landslide risk

Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.

3,144 counties scored 3 rated Very High Showing top 50

#	County	State	NRI score	Rating	NOAA events 2016–2026
1	Santa Barbara County	CA	100	Very High	8
2	Snohomish County	WA	100	Very High	1
3	Monterey County	CA	99.9	Relatively High	29
4	San Bernardino County	CA	99.9	Very High	42
5	Island County	WA	99.9	Relatively High	0
6	Alameda County	CA	99.8	Relatively High	14
7	Sonoma County	CA	99.8	Relatively High	58
8	Macon County	NC	99.8	Relatively High	1
9	Petersburg Borough	AK	99.7	Relatively High	0
10	Orange County	CA	99.7	Relatively High	8
11	San Mateo County	CA	99.7	Relatively High	18
12	Santa Clara County	CA	99.7	Relatively High	24
13	Humboldt County	CA	99.6	Relatively High	1
14	Mendocino County	CA	99.6	Relatively High	0
15	Honolulu County	HI	99.6	Relatively High	7
16	Mariposa County	CA	99.5	Relatively High	30
17	San Diego County	CA	99.5	Relatively High	21
18	Hawkins County	TN	99.5	Relatively High	2
19	Fairbanks North Star Borough	AK	99.4	Relatively High	0
20	San Luis Obispo County	CA	99.4	Relatively High	3
21	Mesa County	CO	99.4	Relatively High	15
22	Contra Costa County	CA	99.3	Relatively High	9
23	Los Angeles County	CA	99.3	Relatively High	24
24	Santa Cruz County	CA	99.3	Relatively High	47
25	Sitka City and Borough	AK	99.2	Relatively High	0
26	Marin County	CA	99.2	Relatively High	21
27	Kitsap County	WA	99.2	Relatively High	0
28	Garfield County	CO	99.1	Relatively High	30
29	Pike County	KY	99.1	Relatively High	8
30	Copiah County	MS	99.1	Relatively High	0
31	King County	WA	99	Relatively High	1
32	Thurston County	WA	99	Relatively High	0
33	Greenbrier County	WV	99	Relatively High	1
34	Vernon County	WI	99	Relatively High	0
35	Anchorage Municipality	AK	98.9	Relatively High	0
36	Idaho County	ID	98.9	Relatively High	1
37	Buncombe County	NC	98.9	Relatively High	1
38	Lake County	CA	98.8	Relatively High	0
39	Carbon County	MT	98.8	Relatively High	0
40	Watauga County	NC	98.8	Relatively High	3
41	Napa County	CA	98.7	Relatively High	19
42	Riverside County	CA	98.7	Relatively High	25
43	Trinity County	CA	98.7	Relatively High	0
44	Del Norte County	CA	98.6	Relatively High	1
45	Hardin County	TN	98.6	Relatively High	0
46	Washington County	UT	98.6	Relatively High	2
47	Kern County	CA	98.5	Relatively High	51
48	Ramsey County	MN	98.5	Relatively High	0
49	San Juan County	UT	98.5	Relatively High	24
50	San Francisco County	CA	98.4	Relatively High	1

Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties — a score of 95 means this county's expected annual loss from landslide exceeds 95% of all other counties. See the methodology page for definitions. Download the full CSV for all 3,144 scored counties.

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