Most Flood-Prone Counties in North Dakota

Based on NOAA Storm Events Database records from 1996 to 2025, these are the North Dakota counties with the most recorded flood events. Cass County tops the list with 87 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.

Rank	County	Total Events	River Floods	Flash Floods
1	Cass County	87	37	50
2	Richland County	83	39	44
3	Grand Forks County	80	26	54
4	Benson County	65	44	21
5	Ramsey County	62	45	17
6	Nelson County	59	44	15
7	Pembina County	56	43	13
8	Walsh County	56	39	17
9	Sargent County	45	23	22
10	Ransom County	44	26	18
11	Traill County	36	22	14
12	Burleigh County	35	13	22
13	Barnes County	31	14	17
14	Steele County	28	16	12
15	Eddy County	26	10	16
16	Ward County	25	10	15
17	Cavalier County	24	17	7
18	Stutsman County	24	6	18
19	Towner County	22	14	8
20	Morton County	22	13	9
21	Griggs County	20	13	7
22	McHenry County	17	10	7
23	Wells County	17	6	11
24	Bottineau County	16	9	7
25	Mountrail County	16	9	7
26	Sioux County	14	6	8
27	Dickey County	13	5	8
28	Dunn County	13	9	4
29	Rolette County	13	4	9
30	LaMoure County	12	4	8
31	McLean County	12	6	6
32	Mercer County	12	8	4
33	Williams County	12	8	4
34	Oliver County	11	6	5
35	Renville County	11	4	7
36	Grant County	10	5	5
37	Emmons County	9	3	6
38	Hettinger County	9	5	4
39	Kidder County	8	3	5
40	McKenzie County	8	8	0
41	Foster County	7	3	4
42	Stark County	7	3	4
43	Golden Valley County	6	2	4
44	Billings County	6	3	3
45	Logan County	6	3	3
46	McIntosh County	5	3	2
47	Pierce County	5	3	2
48	Bowman County	4	3	1
49	Adams County	4	3	1
50	Burke County	3	2	1
51	Sheridan County	2	1	1
52	Divide County	2	2	0
53	Slope County	1	1	0

Source: NOAA Storm Events Database (1996–2025).

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