Sioux, IA
Sioux County in Iowa has 6 FEMA disaster declarations on record covering 1965–2019, most recently Severe Storms and Flooding on Mar 23, 2019 (DR-4421). Its flood risk grade is A (Low risk), ranking #1481 of 3,277 U.S. counties, with 5 NFIP flood insurance claims totaling $429,057 in payouts. Flood risk is relatively low compared to the national average.
FEMA Disaster Declarations in Sioux County
The 6 most recent federally declared disasters affecting Sioux County, IA (1965–2019). Total declarations on record: 6.
| Declared | Incident Type | Title | FEMA Disaster # |
|---|---|---|---|
| Mar 23, 2019 | Flood | Severe Storms and Flooding | DR-4421 |
| Jul 24, 2014 | Flood | Severe Storms, Tornadoes, Straight-Line Winds, and Flooding | DR-4184 |
| Sep 10, 2005 | Hurricane | Hurricane Katrina Evacuation | DR-3239 |
| Jul 9, 1993 | Flood | Severe Storms & Flooding | DR-996 |
| Apr 25, 1969 | Flood | Flooding | DR-259 |
| Apr 22, 1965 | Flood | Flooding | DR-193 |
Score Breakdown
The composite score of 11 is calculated from four weighted factors. See our methodology for details.
Other Counties in Iowa
| County | Grade | Score | Claims | Disasters |
|---|---|---|---|---|
| Sac and Fox Tribe of the Mississippi in Iowa | A | 11 | 0 | 7 |
| Adams | A | 11 | 0 | 6 |
| Appanoose | A | 11 | 0 | 6 |
| Boone | A | 11 | 0 | 6 |
| Cherokee | A | 11 | 4 | 7 |
| Dallas | A | 11 | 1 | 7 |
More Counties in Iowa
Frequently Asked Questions
How many FEMA disaster declarations does Sioux County, IA have?
Sioux County, IA has 6 federal disaster declarations on FEMA record (1965–2019). The 5 most recent are: Severe Storms and Flooding (declared Mar 23, 2019, DR-4421); Severe Storms, Tornadoes, Straight-Line Winds, and Flooding (declared Jul 24, 2014, DR-4184); Hurricane Katrina Evacuation (declared Sep 10, 2005, DR-3239); Severe Storms & Flooding (declared Jul 9, 1993, DR-996); Flooding (declared Apr 25, 1969, DR-259). Counts include flood, severe storm, hurricane, and coastal storm declarations from the OpenFEMA DisasterDeclarationsSummaries dataset.
What is the flood risk grade for Sioux County, IA?
Sioux County is graded A (composite score 11/100, low risk). It ranks #1481 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 Sioux County?
5 NFIP flood insurance claims have been filed in Sioux County, IA, totaling $429,057 in payouts. The average claim is $85,811. Source: FEMA FimaNfipClaims v2 dataset.
Has Sioux County, IA had any recent flood disasters?
Yes. The most recent FEMA declaration affecting Sioux County was Severe Storms and Flooding on Mar 23, 2019 (DR-4421). The county has 6 declared disasters in the OpenFEMA record covering 1965–2019.
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.
Every number on this page links back to FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. ZIPs, counties, and states. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: FEMA OpenFEMA datasets, 2026.