Jefferson County, MS
FEMA National Risk Index scores, disaster declarations & hazard data
Jefferson County has experienced 26 federally declared disasters since 1965, most recently Severe Winter Storm in 2026. Its overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Jefferson County's highest-rated hazards are heat wave, hurricane, and landslide, with its top risk rated "Relatively Low" by FEMA's National Risk Index. Recorded storm events have decreased 33% over the past five years compared to the prior five-year period. Community vulnerability is elevated (90th percentile nationally), suggesting residents may face greater difficulty recovering from major disasters.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Jefferson County has been designated in 26 declarations since 1965, covering 7 disaster types including hurricane (11), severe storm (6), flood (3).
| Year | Type | Event name |
|---|---|---|
| 2026 | Winter Storm | Severe Winter Storm |
| 2026 | Winter Storm | Severe Winter Storm |
| 2023 | Severe Storm | Severe Storms, Straight-Line Winds, And Tornadoes. |
| 2022 | Hurricane | Hurricane Ida |
| 2021 | Severe Ice Storm | Severe Winter Storms |
| 2021 | Hurricane | Hurricane Ida |
| 2021 | Hurricane | Hurricane Delta |
| 2020 | Hurricane | Hurricane Sally |
| 2020 | Hurricane | Hurricane Marco And Tropical Storm Laura |
| 2020 | Biological | Covid-19 Pandemic |
Showing the 10 most recent of 26 total declarations since 1965.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Very Low | 27.6 | 0 | 0 | — |
| Inland Flooding | Very Low | 16.9 | 2 | 0 | $6K |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Very Low | 29 | — | — | — |
| Heat Wave | Relatively Low | 70.5 | 0 | 0 | — |
| Tornado | Relatively Low | 36 | 7 | 0 | $450K |
| Hurricane | Relatively Low | 65.1 | 0 | 0 | — |
| Hail | Relatively Low | 47.8 | 11 | 0 | $70K |
| Strong Wind | Relatively Low | 29 | 0 | 0 | — |
| Winter Weather | Very Low | 5.1 | 0 | 0 | — |
| Ice Storm | Relatively Low | 38.6 | — | — | — |
| Cold Wave | Very Low | 19 | — | — | — |
| Lightning | Very Low | 18.4 | 0 | 0 | — |
| Drought | Relatively Low | 52.4 | 0 | 0 | — |
| Landslide | Relatively Low | 62.4 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Not Applicable | — | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Jefferson County ranks in the 90th percentile (High) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 90th | High |
| Socioeconomic status | 91st | High |
| Household characteristics | 58th | Moderate |
| Racial & ethnic minority status | 99th | High |
| Housing type & transportation | 86th | High |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 63rd | Relatively High |
| Risk to homes | 60th | Relatively High |
| Buildings in direct exposure zone | 93.7% | — |
NOAA tracked 20 weather events in this county over 2016–2025: 12 in 2016–20 vs 8 in 2021–25 (-33% — frequency decreasing).
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Jefferson County?
According to the FEMA National Risk Index, the highest-risk hazards in Jefferson County, Mississippi are heat wave, hurricane, and landslide. The county's overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Has Jefferson County received federal disaster declarations?
Yes. Jefferson County has received 26 federal disaster declarations since 1965, including declarations in 2026. The most common disaster type on record is hurricane (11 declarations).
Has Jefferson County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Jefferson County include Severe Winter Storm (2026), Severe Winter Storm (2026). See the declarations table above for the full history since 1965.
How does Jefferson County's natural hazard risk compare to nearby counties?
Among neighboring counties, Copiah County, MS has the highest overall natural hazard risk (Relatively Low) and Tensas Parish, LA has the lowest (Very Low). Jefferson County is rated Very Low overall.
How is Jefferson County's composite disaster risk index calculated?
Jefferson County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Jefferson County's composite score of 11 means its overall natural hazard risk is higher than 11% of US counties.