Counties with the most major river floods

Ranked by major-flood crests at the county's river gauges. Harris County, TX, leads with 123.

  1. 1Harris CountyTX123
  2. 2Snohomish CountyWA109
  3. 3Cotton CountyOK93
Counties with the most major river floods
1Harris County TX12326
2Snohomish County WA1097
3Cotton County OK933
4Somerset County NJ8818
5Rock Island County IL783
6King County WA766
7Montgomery County TX7511
8Cook County IL6937
9Allegheny County PA6614
10Travis County TX6510
11Allen Parish LA615
12Henderson County IL603
13Bexar County TX599
14St. Tammany Parish LA5911
15Bucks County PA597
16Delaware County NY5721
17Passaic County NJ5710
18Clay County FL576
19Sevier County AR565
20McCurtain County OK563
21St. Louis County MO554
22Val Verde County TX549
23Cass County ND545
24Muscatine County IA543
25Hillsborough County FL5419
26Comal County TX536
27Clayton County IA5310
28Scott County IA534
29Fulton County GA5317
30Plymouth County IA519
31Victoria County TX504
32Skagit County WA492
33Dallas County TX495
34Broome County NY498
35Yankton County SD472
36Uvalde County TX476
37Wayne County IL471
38Liberty County TX476
39Cowley County KS473
40Lavaca County TX465
41Bossier Parish LA463
42Duval County FL4625
43Horry County SC436
44Frederick County MD436
45Mississippi County AR421
46Elko County NV4213
47Cherokee County OK422
48New Castle County DE4210
49Charleston County SC422
50Monmouth County NJ429
51Lawrence County AL421
52Nueces County TX417
53Lincoln County MO413
54Carter County OK411
55Gregg County TX403
56Pembina County ND393
57Rogers County OK382
58Live Oak County TX382
59Kay County OK383
60Jackson County AR371
61Caldwell County TX373
62Mason County WV373
63Chester County PA377
64Tulsa County OK377
65Spink County SD377
66Lee County IA372
67Delaware County IN361
68Louisa County IA365
69Lake County IL3611
70Wharton County TX364
71Northampton County VA363
72McMullen County TX353
73Wood County TX353
74Washington County IA351
75Randolph County AR353
76Johnston County NC355
77Meigs County OH342
78Washington County MD348
79Le Flore County OK343
80Clackamas County OR3411
81Richland County ND332
82Chicot County AR332
83Jefferson County WV333
84Karnes County TX323
85Valley County MT325
86Sussex County DE317
87Alexander County IL312
88District of Columbia DC316
89Shelby County TN3111
90Anderson County TX311
91Bradford County FL316
92Delaware County PA314
93Philadelphia County PA317
94Dubuque County IA312
95West Baton Rouge Parish LA311
96Burleigh County ND312
97Hancock County OH314
98Lawrence County IN303
99Montgomery County PA305
100Newton County TX307

Figures come from each place’s page and share its sources and rules; see the methodology.

More floods rankings