Disaster-history hazard lens
River, flash, coastal, and other flooding. Compare official county histories below while keeping FEMA administrative declarations separate from NOAA observed-event reports.
Data updated Aug 21, 2026
These counts do not measure current danger, probability, severity, loss, or personal exposure. A higher rank means only that a county has more records within the same official source and exact coverage window. FEMA and NOAA counts are never added together.
Administrative records
Federal administrative declarations that include a county designation and map to this hazard category. A declaration is a government action, not a physical-event census.
47 counties have a positive flood count in this source.
Coverage: Jan 1, 1964 – Aug 21, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
Observed-event reports
Distinct NOAA Storm Events records explicitly coded to a county and mapped to this hazard category. Forecast-zone and marine-zone records are excluded from county totals.
53 counties have a positive flood count in this source.
Coverage: Jan 1, 1996 – Mar 19, 2024
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Anchorage Municipality, Alaska | 1 |
Coverage: Jan 1, 1996 – Sep 25, 2025
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Providence County, Rhode Island | 146 |
Coverage: Jan 1, 1996 – Apr 12, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | King County, Washington | 8 |
Coverage: Jan 1, 1996 – Apr 16, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Chittenden County, Vermont | 60 |
Coverage: Jan 1, 1996 – May 3, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Clark County, Nevada | 398 |
Coverage: Jan 1, 1996 – May 10, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Cumberland County, Maine | 70 |
Coverage: Jan 1, 1996 – May 15, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Honolulu County, Hawaii | 229 |
| 2 | Hillsborough County, New Hampshire | 82 |
| 3 | Cass County, North Dakota | 74 |
Coverage: Jan 1, 1996 – May 18, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Cook County, Illinois | 400 |
Coverage: Jan 1, 1996 – May 19, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Middlesex County, Massachusetts | 225 |
| 2 | Hartford County, Connecticut | 145 |
| 3 | Wayne County, Michigan | 59 |
| 4 | Kent County, Michigan | 22 |
Coverage: Jan 1, 1996 – May 20, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Montgomery County, Maryland | 428 |
| 2 | Bergen County, New Jersey | 376 |
Coverage: Jan 1, 1996 – May 24, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Philadelphia County, Pennsylvania | 220 |
Coverage: Jan 1, 1996 – May 25, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Maricopa County, Arizona | 661 |
| 2 | Laramie County, Wyoming | 92 |
Coverage: Jan 1, 1996 – May 26, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Fresno County, California | 344 |
| 2 | Los Angeles County, California | 244 |
| 3 | Ventura County, California | 97 |
| 4 | Multnomah County, Oregon | 13 |
Coverage: Jan 1, 1996 – May 27, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Fairfax County, Virginia | 517 |
| 2 | New Castle County, Delaware | 227 |
| 3 | Jefferson County, Kentucky | 222 |
| 4 | Greenville County, South Carolina | 104 |
| 5 | Marion County, Indiana | 103 |
| 6 | Milwaukee County, Wisconsin | 70 |
| 7 | Hennepin County, Minnesota | 54 |
Coverage: Jan 1, 1996 – May 28, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Kanawha County, West Virginia | 193 |
| 2 | East Baton Rouge Parish, Louisiana | 115 |
| 3 | Bernalillo County, New Mexico | 97 |
| 4 | Harrison County, Mississippi | 79 |
Coverage: Jan 1, 1996 – May 29, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Oklahoma County, Oklahoma | 209 |
| 2 | Kings County, New York | 83 |
| 3 | Salt Lake County, Utah | 43 |
| 4 | Yellowstone County, Montana | 37 |
| 5 | Ada County, Idaho | 23 |
Coverage: Jan 1, 1996 – May 30, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Wake County, North Carolina | 289 |
| 2 | El Paso County, Colorado | 201 |
| 3 | Douglas County, Nebraska | 87 |
Coverage: Jan 1, 1996 – May 31, 2026
Rankings compare only this source and exact coverage window. Equal counts share a rank.
| Rank | County | County-event records |
|---|---|---|
| 1 | Pulaski County, Arkansas | 271 |
| 2 | Polk County, Iowa | 268 |
| 3 | Harris County, Texas | 226 |
| 4 | Minnehaha County, South Dakota | 225 |
| 5 | Shelby County, Tennessee | 214 |
| 6 | Miami-Dade County, Florida | 169 |
| 7 | Jefferson County, Alabama | 153 |
| 8 | Franklin County, Ohio | 147 |
| 9 | Fulton County, Georgia | 116 |
| 10 | Johnson County, Kansas | 99 |
| 11 | St. Louis County, Missouri | 81 |
