Indiana inland flooding risk
Marion County has the highest inland flooding risk in Indiana, scoring 98.3 out of 100 — rated "Relatively High" by FEMA's National Risk Index. Recorded inland flooding events across Indiana have decreased 39% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Marion County | 98.3 | Relatively High | 33 |
| 2 | Lake County | 96.2 | Relatively High | 33 |
| 3 | Allen County | 93.5 | Relatively High | 9 |
| 4 | Hamilton County | 91.1 | Relatively Moderate | 17 |
| 5 | Vanderburgh County | 89.8 | Relatively Moderate | 65 |
| 6 | St. Joseph County | 85.4 | Relatively Moderate | 11 |
| 7 | Vigo County | 85.1 | Relatively Moderate | 14 |
| 8 | Elkhart County | 84.1 | Relatively Moderate | 12 |
| 9 | Madison County | 82.6 | Relatively Moderate | 5 |
| 10 | Delaware County | 82.5 | Relatively Moderate | 21 |
| 11 | Clark County | 81.2 | Relatively Moderate | 26 |
| 12 | Hendricks County | 81 | Relatively Moderate | 8 |
| 13 | Monroe County | 80.8 | Relatively Moderate | 9 |
| 14 | Porter County | 80 | Relatively Moderate | 20 |
| 15 | Tippecanoe County | 79.7 | Relatively Moderate | 4 |
| 16 | Wayne County | 79.7 | Relatively Moderate | 31 |
| 17 | Johnson County | 78.9 | Relatively Moderate | 6 |
| 18 | Bartholomew County | 78 | Relatively Moderate | 13 |
| 19 | LaPorte County | 74.6 | Relatively Moderate | 2 |
| 20 | Floyd County | 74.2 | Relatively Moderate | 9 |
| 21 | Grant County | 73.4 | Relatively Moderate | 0 |
| 22 | Morgan County | 70.9 | Relatively Low | 10 |
| 23 | Warrick County | 68.9 | Relatively Low | 52 |
| 24 | Dubois County | 66.1 | Relatively Low | 40 |
| 25 | LaGrange County | 65.6 | Relatively Low | 1 |
| 26 | Miami County | 65.1 | Relatively Low | 0 |
| 27 | Howard County | 64.5 | Relatively Low | 7 |
| 28 | Cass County | 64.1 | Relatively Low | 2 |
| 29 | Kosciusko County | 63.7 | Relatively Low | 4 |
| 30 | Daviess County | 62.2 | Relatively Low | 12 |
| 31 | Adams County | 61.3 | Relatively Low | 3 |
| 32 | Jackson County | 57.6 | Relatively Low | 11 |
| 33 | Hancock County | 57.1 | Relatively Low | 5 |
| 34 | Boone County | 56.8 | Relatively Low | 8 |
| 35 | Harrison County | 56.7 | Relatively Low | 7 |
| 36 | Jefferson County | 55.9 | Relatively Low | 6 |
| 37 | Lawrence County | 55.9 | Relatively Low | 11 |
| 38 | Henry County | 54.8 | Relatively Low | 5 |
| 39 | Ripley County | 53.8 | Relatively Low | 93 |
| 40 | Knox County | 53.4 | Relatively Low | 23 |
| 41 | Franklin County | 52.7 | Relatively Low | 42 |
| 42 | Dearborn County | 52.6 | Relatively Low | 34 |
| 43 | Shelby County | 52.5 | Relatively Low | 8 |
| 44 | Greene County | 52 | Relatively Low | 5 |
| 45 | DeKalb County | 51.8 | Relatively Low | 1 |
| 46 | Posey County | 51.2 | Relatively Low | 90 |
| 47 | Owen County | 49.4 | Relatively Low | 6 |
| 48 | Perry County | 49 | Relatively Low | 11 |
| 49 | Fayette County | 48.7 | Relatively Low | 20 |
| 50 | White County | 48.6 | Relatively Low | 1 |
| 51 | Noble County | 48.4 | Relatively Low | 1 |
| 52 | Huntington County | 48.3 | Relatively Low | 0 |
| 53 | Putnam County | 48.1 | Relatively Low | 4 |
| 54 | Orange County | 47.6 | Relatively Low | 3 |
| 55 | Washington County | 47.4 | Relatively Low | 16 |
| 56 | Wabash County | 47.3 | Relatively Low | 1 |
| 57 | Carroll County | 47.2 | Relatively Low | 4 |
| 58 | Randolph County | 47 | Relatively Low | 5 |
| 59 | Spencer County | 45.5 | Relatively Low | 22 |
| 60 | Jasper County | 44.9 | Relatively Low | 7 |
| 61 | Marshall County | 44.9 | Relatively Low | 4 |
| 62 | Jennings County | 44.4 | Relatively Low | 7 |
| 63 | Montgomery County | 42.8 | Relatively Low | 6 |
| 64 | Crawford County | 40.9 | Relatively Low | 10 |
| 65 | Steuben County | 38.2 | Relatively Low | 0 |
| 66 | Brown County | 38 | Relatively Low | 9 |
| 67 | Wells County | 37.7 | Relatively Low | 1 |
| 68 | Gibson County | 36.9 | Relatively Low | 123 |
| 69 | Jay County | 36.8 | Relatively Low | 2 |
| 70 | Decatur County | 36.5 | Relatively Low | 12 |
| 71 | Clinton County | 34.9 | Very Low | 8 |
| 72 | Parke County | 34.4 | Very Low | 4 |
| 73 | Whitley County | 34.3 | Very Low | 4 |
| 74 | Clay County | 34.2 | Very Low | 5 |
| 75 | Vermillion County | 33 | Very Low | 3 |
| 76 | Rush County | 28.5 | Very Low | 5 |
| 77 | Martin County | 28.3 | Very Low | 7 |
| 78 | Starke County | 27.5 | Very Low | 1 |
| 79 | Pike County | 26.8 | Very Low | 70 |
| 80 | Scott County | 23.9 | Very Low | 3 |
| 81 | Sullivan County | 23 | Very Low | 6 |
| 82 | Switzerland County | 21.5 | Very Low | 22 |
| 83 | Fountain County | 21.1 | Very Low | 2 |
| 84 | Fulton County | 20.5 | Very Low | 1 |
| 85 | Newton County | 19.3 | Very Low | 5 |
| 86 | Tipton County | 18.9 | Very Low | 1 |
| 87 | Blackford County | 18.7 | Very Low | 0 |
| 88 | Pulaski County | 18.4 | Very Low | 1 |
| 89 | Warren County | 12.3 | Very Low | 0 |
| 90 | Union County | 9.5 | Very Low | 11 |
| 91 | Benton County | 8.5 | Very Low | 2 |
| 92 | Ohio County | 7.8 | Very Low | 5 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Inland Flooding risk nationally:
Other hazard risks in Indiana:
Frequently asked questions
What is the highest inland flooding risk county in Indiana?
Marion County, IN has the highest inland flooding risk in Indiana, with a FEMA National Risk Index score of 98.3 out of 100 (rated "Relatively High").
What causes inland flooding risk in Indiana?
Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.