Mercer County, MO
FEMA National Risk Index scores, disaster declarations & hazard data
Mercer County has experienced 20 federally declared disasters since 1973, most recently Severe Storms, Straight-Line Winds, Tornadoes, And Flooding in 2026. Its overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Mercer County's highest-rated hazards are landslide, drought, and wildfire, with its top risk rated "Relatively Low" by FEMA's National Risk Index. NOAA records 21 storm events in the county over the past decade.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Mercer County has been designated in 20 declarations since 1973, covering 6 disaster types including severe storm (11), severe ice storm (3), biological (2).
| Year | Type | Event name |
|---|---|---|
| 2026 | Severe Storm | Severe Storms, Straight-Line Winds, Tornadoes, And Flooding |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
| 2015 | Severe Storm | Severe Storms, Tornadoes, Straight-Line Winds, And Flooding |
| 2011 | Severe Storm | Severe Winter Storm |
| 2010 | Severe Storm | Severe Storms, Flooding, And Tornadoes |
| 2009 | Severe Ice Storm | Severe Winter Storm |
| 2008 | Severe Ice Storm | Severe Winter Storms |
| 2008 | Severe Ice Storm | Severe Winter Storms |
Showing the 10 most recent of 20 total declarations since 1973.
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 | 48.3 | 0 | 0 | — |
| Inland Flooding | Very Low | 17.9 | 5 | 0 | — |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Very Low | 17.2 | — | — | — |
| Heat Wave | Relatively Low | 46.3 | 1 | 0 | — |
| Tornado | Relatively Low | 44 | 2 | 0 | — |
| Hurricane | Very Low | 11.4 | 0 | 0 | — |
| Hail | Relatively Low | 42.5 | 13 | 0 | — |
| Strong Wind | Relatively Low | 20.5 | 0 | 0 | — |
| Winter Weather | Very Low | 17.1 | 0 | 0 | — |
| Ice Storm | Very Low | 9.1 | — | — | — |
| Cold Wave | Relatively Low | 34.8 | — | — | — |
| Lightning | Very Low | 9.4 | 0 | 0 | — |
| Drought | Relatively Moderate | 77.4 | 0 | 0 | — |
| Landslide | Relatively Low | 79 | 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
Mercer County ranks in the 49th percentile (Low) 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 | 49th | Low |
| Socioeconomic status | 47th | Low |
| Household characteristics | 70th | Moderate |
| Racial & ethnic minority status | 16th | Very low |
| Housing type & transportation | 49th | Low |
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 | 61st | Relatively High |
| Risk to homes | 59th | Relatively Moderate |
| Buildings in direct exposure zone | 81.9% | — |
NOAA tracked 21 weather events in this county over 2016–2025: 8 in 2016–20 vs 13 in 2021–25 .
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 Mercer County?
According to the FEMA National Risk Index, the highest-risk hazards in Mercer County, Missouri are landslide, drought, and wildfire. The county's overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Has Mercer County received federal disaster declarations?
Yes. Mercer County has received 20 federal disaster declarations since 1973, including declarations in 2026. The most common disaster type on record is severe storm (11 declarations).
Has Mercer County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Mercer County include Severe Storms, Straight-Line Winds, Tornadoes, And Flooding (2026). See the declarations table above for the full history since 1973.
How does Mercer County's natural hazard risk compare to nearby counties?
Among neighboring counties, Harrison County, MO has the highest overall natural hazard risk (Very Low) and Putnam County, MO has the lowest (Very Low). Mercer County is rated Very Low overall.
How is Mercer County's composite disaster risk index calculated?
Mercer 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. Mercer County's composite score of 12 means its overall natural hazard risk is higher than 12% of US counties.