Johnson, IA
Johnson County in Iowa has 13 FEMA disaster declarations on record covering 1965–2013, most recently Severe Storms, Straight-Line Winds, and Flooding on May 31, 2013 (DR-4119). Its flood risk grade is A (Low risk), ranking #622 of 3,277 U.S. counties, with 3 NFIP flood insurance claims totaling $43,339 in payouts. Flood risk is relatively low compared to the national average.
FEMA Disaster Declarations in Johnson County
The 13 most recent federally declared disasters affecting Johnson County, IA (1965–2013). Total declarations on record: 13.
| Declared | Incident Type | Title | FEMA Disaster # |
|---|---|---|---|
| May 31, 2013 | Flood | Severe Storms, Straight-Line Winds, and Flooding | DR-4119 |
| Sep 10, 2005 | Hurricane | Hurricane Katrina Evacuation | DR-3239 |
| Jun 19, 2002 | Flood | Severe Storms and Flooding | DR-1420 |
| Jul 2, 1998 | Flood | Severe Storms, Tornadoes and Flooding | DR-1230 |
| Jul 9, 1993 | Flood | Severe Storms & Flooding | DR-996 |
| Jul 12, 1991 | Flood | Severe Storms & Flooding | DR-911 |
| Sep 6, 1990 | Flood | Severe Storms & Flooding | DR-879 |
| May 26, 1990 | Flood | Severe Storms & Flooding | DR-868 |
| Jun 24, 1974 | Flood | Severe Storms & Flooding | DR-443 |
| May 23, 1973 | Flood | Severe Storms & Flooding | DR-386 |
| Aug 18, 1972 | Flood | Severe Storms & Flooding | DR-348 |
| Aug 14, 1969 | Flood | Heavy Rains & Flooding | DR-269 |
| Apr 22, 1965 | Flood | Flooding | DR-193 |
Score Breakdown
The composite score of 15 is calculated from four weighted factors. See our methodology for details.
Other Counties in Iowa
| County | Grade | Score | Claims | Disasters |
|---|---|---|---|---|
| Allamakee | A | 15 | 0 | 13 |
| Clayton | A | 16 | 3 | 15 |
| Des Moines | A | 14 | 25 | 14 |
| Buchanan | A | 14 | 6 | 12 |
| Butler | A | 14 | 9 | 12 |
| Louisa | A | 14 | 1 | 12 |
More Counties in Iowa
Frequently Asked Questions
How many FEMA disaster declarations does Johnson County, IA have?
Johnson County, IA has 13 federal disaster declarations on FEMA record (1965–2013). The 5 most recent are: Severe Storms, Straight-Line Winds, and Flooding (declared May 31, 2013, DR-4119); Hurricane Katrina Evacuation (declared Sep 10, 2005, DR-3239); Severe Storms and Flooding (declared Jun 19, 2002, DR-1420); Severe Storms, Tornadoes and Flooding (declared Jul 2, 1998, DR-1230); Severe Storms & Flooding (declared Jul 9, 1993, DR-996). Counts include flood, severe storm, hurricane, and coastal storm declarations from the OpenFEMA DisasterDeclarationsSummaries dataset.
What is the flood risk grade for Johnson County, IA?
Johnson County is graded A (composite score 15/100, low risk). It ranks #622 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 Johnson County?
3 NFIP flood insurance claims have been filed in Johnson County, IA, totaling $43,339 in payouts. The average claim is $14,446. Source: FEMA FimaNfipClaims v2 dataset.
Has Johnson County, IA had any recent flood disasters?
Yes. The most recent FEMA declaration affecting Johnson County was Severe Storms, Straight-Line Winds, and Flooding on May 31, 2013 (DR-4119). The county has 13 declared disasters in the OpenFEMA record covering 1965–2013.
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.