Louisiana coastal flooding risk
Jefferson Parish has the highest coastal flooding risk in Louisiana, scoring 95.6 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Jefferson Parish | 95.6 | Very High |
| 2 | St. Charles Parish | 95.4 | Very High |
| 3 | Terrebonne Parish | 94 | Relatively High |
| 4 | St. Mary Parish | 93 | Relatively High |
| 5 | St. Martin Parish | 87 | Relatively High |
| 6 | Cameron Parish | 84.6 | Relatively High |
| 7 | Calcasieu Parish | 84 | Relatively High |
| 8 | St. James Parish | 83.4 | Relatively High |
| 9 | Plaquemines Parish | 83 | Relatively High |
| 10 | St. Tammany Parish | 82.6 | Relatively High |
| 11 | Lafourche Parish | 81.8 | Relatively Moderate |
| 12 | Orleans Parish | 81.2 | Relatively Moderate |
| 13 | Livingston Parish | 79.8 | Relatively Moderate |
| 14 | Ascension Parish | 79.2 | Relatively Moderate |
| 15 | Assumption Parish | 78 | Relatively Moderate |
| 16 | St. John the Baptist Parish | 75.4 | Relatively Moderate |
| 17 | St. Bernard Parish | 74.4 | Relatively Moderate |
| 18 | Iberia Parish | 72 | Relatively Moderate |
| 19 | Tangipahoa Parish | 69.4 | Relatively Moderate |
| 20 | Vermilion Parish | 66.2 | Relatively Moderate |
| 21 | Iberville Parish | 65.6 | Relatively Moderate |
| 22 | East Baton Rouge Parish | 54.6 | Relatively Low |
| 23 | Jefferson Davis Parish | 45.6 | Relatively Low |
| 24 | Acadia Parish | 45.4 | Relatively Low |
| 25 | Lafayette Parish | 45 | Relatively Low |
| 26 | St. Landry Parish | 41.8 | Very Low |
| 27 | Allen Parish | 30.6 | Very Low |
| 28 | Beauregard Parish | 22.6 | Very Low |
| 29 | West Baton Rouge Parish | 16 | Very Low |
| 30 | Avoyelles Parish | 0 | No Rating |
| 31 | Concordia Parish | 0 | No Rating |
| 32 | East Feliciana Parish | 0 | No Rating |
| 33 | Evangeline Parish | 0 | No Rating |
| 34 | Pointe Coupee Parish | 0 | No Rating |
| 35 | West Feliciana Parish | 0 | No Rating |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Coastal Flooding risk nationally:
Other hazard risks in Louisiana:
Frequently asked questions
What is the highest coastal flooding risk county in Louisiana?
Jefferson Parish, LA has the highest coastal flooding risk in Louisiana, with a FEMA National Risk Index score of 95.6 out of 100 (rated "Very High").
How many counties in Louisiana are rated Very High for coastal flooding risk?
2 of 35 scored Louisiana counties are rated "Very High" for coastal flooding risk by FEMA's National Risk Index.
What causes coastal flooding risk in Louisiana?
Coastal flooding scores cover storm surge, wave action, and tidal flooding along the Gulf, Atlantic, and Pacific coasts, and Great Lakes shoreline. Inland flooding is scored separately. Counties with "Not Applicable" ratings have no significant coastal exposure. Coastal flood events are reported at zone level in NOAA Storm Events and are not included in county-level counts.