Onslow County, NC
FEMA National Risk Index scores, disaster declarations & hazard data
Onslow County has experienced 30 federally declared disasters since 1996, most recently Severe Winter Storm in 2026. Its overall natural hazard risk is rated Relatively High — higher risk than most US counties.
Onslow County's highest-rated hazards are hurricane, winter weather, and lightning, with its top risk rated "Very High" by FEMA's National Risk Index. NOAA records 65 storm events in the county over the past decade. Community vulnerability is elevated (79th 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. Onslow County has been designated in 30 declarations since 1996, covering 5 disaster types including hurricane (22), tropical storm (3), biological (2).
| Year | Type | Event name |
|---|---|---|
| 2026 | Winter Storm | Severe Winter Storm |
| 2025 | Tropical Storm | Potential Tropical Cyclone Eight |
| 2024 | Tropical Storm | Tropical Storm Debby |
| 2024 | Tropical Storm | Hurricane Helene |
| 2023 | Hurricane | Hurricane Ian |
| 2021 | Hurricane | Hurricane Isaias |
| 2020 | Hurricane | Hurricane Isaias |
| 2020 | Hurricane | Hurricane Dorian |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
Showing the 10 most recent of 30 total declarations since 1996.
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 | Relatively Low | 85.9 | 0 | 0 | — |
| Inland Flooding | Relatively Moderate | 78.6 | 31 | 0 | — |
| Coastal Flooding | Relatively Moderate | 81 | 0 | 0 | — |
| Earthquake | Relatively Low | 66.7 | — | — | — |
| Heat Wave | Relatively Moderate | 87.5 | 9 | 0 | — |
| Tornado | Relatively Moderate | 85.8 | 6 | 0 | — |
| Hurricane | Very High | 99 | 0 | 0 | — |
| Hail | Relatively Low | 44.4 | 19 | 0 | — |
| Strong Wind | Relatively Moderate | 80.6 | 0 | 0 | — |
| Winter Weather | Very High | 98.4 | 0 | 0 | — |
| Ice Storm | Relatively Moderate | 76.4 | — | — | — |
| Cold Wave | Relatively Low | 60.4 | — | — | — |
| Lightning | Relatively High | 92.4 | 2 | 2 | — |
| Drought | Relatively Low | 34.6 | 0 | 0 | — |
| Landslide | Very Low | 38.6 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Insufficient Data | — | — | — | — |
| 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
Onslow County ranks in the 79th 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 | 79th | High |
| Socioeconomic status | 76th | High |
| Household characteristics | 68th | Moderate |
| Racial & ethnic minority status | 72nd | Moderate |
| Housing type & transportation | 75th | 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 | 68th | Relatively High |
| Risk to homes | 72nd | Relatively High |
| Buildings in direct exposure zone | 63.5% | — |
NOAA tracked 65 weather events in this county over 2016–2025: 31 in 2016–20 vs 34 in 2021–25 (+10% — relatively stable).
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 Onslow County?
According to the FEMA National Risk Index, the highest-risk hazards in Onslow County, North Carolina are hurricane, winter weather, and lightning. The county's overall natural hazard risk is rated Relatively High — higher risk than most US counties.
Has Onslow County received federal disaster declarations?
Yes. Onslow County has received 30 federal disaster declarations since 1996, including declarations in 2026. The most common disaster type on record is hurricane (22 declarations).
Has Onslow County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Onslow County include Severe Winter Storm (2026), Potential Tropical Cyclone Eight (2025), Tropical Storm Debby (2024), Hurricane Helene (2024). See the declarations table above for the full history since 1996.
How does Onslow County's natural hazard risk compare to nearby counties?
Among neighboring counties, New Hanover County, NC has the highest overall natural hazard risk (Relatively High) and Jones County, NC has the lowest (Relatively Low). Onslow County is rated Relatively High overall.
How is Onslow County's composite disaster risk index calculated?
Onslow 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. Onslow County's composite score of 95 means its overall natural hazard risk is higher than 95% of US counties.