New Castle, DE
New Castle County in Delaware has 9 FEMA disaster declarations on record covering 1999–2021, most recently Remnants of Hurricane Ida on Oct 24, 2021 (DR-4627). Its flood risk grade is A (Low risk), ranking #174 of 3,277 U.S. counties, with 39 NFIP flood insurance claims totaling $617,579 in payouts. Flood risk is relatively low compared to the national average.
FEMA Disaster Declarations in New Castle County
The 9 most recent federally declared disasters affecting New Castle County, DE (1999–2021). Total declarations on record: 9.
| Declared | Incident Type | Title | FEMA Disaster # |
|---|---|---|---|
| Oct 24, 2021 | Hurricane | Remnants of Hurricane Ida | DR-4627 |
| Oct 2, 2020 | Hurricane | Tropical Storm Isaias | DR-4566 |
| Nov 16, 2012 | Hurricane | Hurricane Sandy | DR-4090 |
| Oct 29, 2012 | Hurricane | Hurricane Sandy | DR-3357 |
| Aug 28, 2011 | Hurricane | Hurricane Irene | DR-3336 |
| Sep 30, 2005 | Hurricane | Hurricane Katrina Evacuation | DR-3263 |
| Sep 23, 2003 | Hurricane | Tropical Storm Henri | DR-1495 |
| Sep 20, 2003 | Hurricane | Hurricane Isabel | DR-1494 |
| Sep 21, 1999 | Hurricane | Hurricane Floyd Major Disaster Declarations | DR-1297 |
Score Breakdown
The composite score of 20 is calculated from four weighted factors. See our methodology for details.
Other Counties in Delaware
More Counties in Delaware
Frequently Asked Questions
How many FEMA disaster declarations does New Castle County, DE have?
New Castle County, DE has 9 federal disaster declarations on FEMA record (1999–2021). The 5 most recent are: Remnants of Hurricane Ida (declared Oct 24, 2021, DR-4627); Tropical Storm Isaias (declared Oct 2, 2020, DR-4566); Hurricane Sandy (declared Nov 16, 2012, DR-4090); Hurricane Sandy (declared Oct 29, 2012, DR-3357); Hurricane Irene (declared Aug 28, 2011, DR-3336). Counts include flood, severe storm, hurricane, and coastal storm declarations from the OpenFEMA DisasterDeclarationsSummaries dataset.
What is the flood risk grade for New Castle County, DE?
New Castle County is graded A (composite score 20/100, low risk). It ranks #174 of 3,277 U.S. counties for flood risk in our scoring model. The grade combines NFIP claims density (40%), disaster frequency (25%), claim severity (20%), and year-over-year trend (15%).
How many NFIP flood insurance claims have been filed in New Castle County?
39 NFIP flood insurance claims have been filed in New Castle County, DE, totaling $617,579 in payouts. The average claim is $15,835. Source: FEMA FimaNfipClaims v2 dataset.
Has New Castle County, DE had any recent flood disasters?
Yes. The most recent FEMA declaration affecting New Castle County was Remnants of Hurricane Ida on Oct 24, 2021 (DR-4627). The county has 9 declared disasters in the OpenFEMA record covering 1999–2021.
The this entity record above pulls directly from FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims. What follows is the per-entity context — how this entity sits in the broader U.S. flood risk, NFIP claims, and disaster declarations distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. ZIPs, counties, and states with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: FEMA OpenFEMA datasets, 2026.