Most Flood-Prone Counties in Ohio

Based on NOAA Storm Events Database records from 1996 to 2025, these are the Ohio counties with the most recorded flood events. Hamilton County tops the list with 208 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.

Rank	County	Total Events	River Floods	Flash Floods
1	Hamilton County	208	62	146
2	Washington County	194	161	33
3	Scioto County	141	67	74
4	Franklin County	136	69	67
5	Warren County	134	70	64
6	Belmont County	132	34	98
7	Clermont County	120	32	88
8	Cuyahoga County	114	17	97
9	Athens County	113	60	53
10	Meigs County	105	72	33
11	Noble County	100	45	55
12	Brown County	99	41	58
13	Tuscarawas County	97	29	68
14	Montgomery County	95	48	47
15	Gallia County	94	52	42
16	Vinton County	93	49	44
17	Adams County	93	33	60
18	Hocking County	92	52	40
19	Lawrence County	92	48	44
20	Ross County	92	52	40
21	Coshocton County	86	16	70
22	Mercer County	86	59	27
23	Logan County	84	45	39
24	Licking County	83	47	36
25	Butler County	83	28	55
26	Fairfield County	77	36	41
27	Lorain County	75	11	62
28	Muskingum County	75	21	54
29	Highland County	70	22	48
30	Clark County	70	38	32
31	Shelby County	68	47	21
32	Darke County	67	37	30
33	Monroe County	67	19	48
34	Auglaize County	67	40	27
35	Columbiana County	67	20	47
36	Guernsey County	67	27	40
37	Greene County	66	40	26
38	Pickaway County	62	34	28
39	Pike County	62	33	29
40	Stark County	60	11	49
41	Summit County	59	5	54
42	Perry County	56	14	42
43	Preble County	56	18	38
44	Carroll County	54	12	42
45	Clinton County	54	27	27
46	Delaware County	53	35	18
47	Trumbull County	53	12	41
48	Richland County	50	11	39
49	Jackson County	50	19	31
50	Harrison County	49	8	41
51	Miami County	49	26	23
52	Ashland County	47	9	38
53	Union County	46	31	15
54	Medina County	45	5	40
55	Ashtabula County	44	3	41
56	Hardin County	42	26	16
57	Hancock County	41	19	22
58	Erie County	40	8	26
59	Lake County	40	14	26
60	Jefferson County	39	5	34
61	Morgan County	38	22	16
62	Champaign County	37	25	12
63	Fayette County	36	17	19
64	Huron County	35	4	31
65	Lucas County	33	5	22
66	Crawford County	33	7	26
67	Holmes County	33	4	29
68	Portage County	32	4	28
69	Marion County	32	17	15
70	Wayne County	31	4	27
71	Knox County	29	9	20
72	Seneca County	28	5	23
73	Geauga County	27	0	27
74	Ottawa County	27	7	14
75	Wood County	27	12	15
76	Wyandot County	26	6	20
77	Morrow County	24	8	16
78	Sandusky County	24	8	12
79	Mahoning County	23	5	18
80	Madison County	21	11	10
81	Henry County	15	5	10
82	Paulding County	15	4	11
83	Fulton County	14	2	12
84	Van Wert County	14	4	10
85	Putnam County	13	5	8
86	Defiance County	12	2	10
87	Allen County	11	2	9
88	Williams County	5	1	4

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

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