Illinois: 102 counties covered

Across 102 Illinois counties with a FEMA flood score, the average national percentile is 52.4 — but that average hides real spread between counties, which is why each one gets its own page rather than a single statewide number.

• Cook County — 99.9th percentile, Very High
• DuPage County — 98th percentile, Relatively High
• Lake County — 97.2th percentile, Relatively High
• Will County — 97.9th percentile, Relatively High
• Kane County — 95.5th percentile, Relatively High
• McHenry County — 93.1th percentile, Relatively Moderate
• Winnebago County — 94.4th percentile, Relatively High
• Madison County — 92.3th percentile, Relatively Moderate
• St. Clair County — 94.5th percentile, Relatively High
• Champaign County — 90.4th percentile, Relatively Moderate
• Sangamon County — 91.2th percentile, Relatively Moderate
• Peoria County — 88.7th percentile, Relatively Moderate
• McLean County — 85.2th percentile, Relatively Moderate
• Kendall County — 79.7th percentile, Relatively Moderate
• Rock Island County — 79.5th percentile, Relatively Moderate
• Tazewell County — 84.4th percentile, Relatively Moderate
• LaSalle County — 88.2th percentile, Relatively Moderate
• Kankakee County — 92.5th percentile, Relatively Moderate
• DeKalb County — 83th percentile, Relatively Moderate
• Macon County — 83.3th percentile, Relatively Moderate
• Vermilion County — 76.5th percentile, Relatively Moderate
• Williamson County — 69.9th percentile, Relatively Low
• Adams County — 60.7th percentile, Relatively Low
• Whiteside County — 70.1th percentile, Relatively Low
• Grundy County — 66.5th percentile, Relatively Low
• Boone County — 63.9th percentile, Relatively Low
• Jackson County — 76.5th percentile, Relatively Moderate
• Ogle County — 77th percentile, Relatively Moderate
• Knox County — 49.4th percentile, Relatively Low
• Henry County — 51.5th percentile, Relatively Low
• Coles County — 74.5th percentile, Relatively Moderate
• Macoupin County — 68.7th percentile, Relatively Low
• Stephenson County — 77.9th percentile, Relatively Moderate
• Woodford County — 51.5th percentile, Relatively Low
• Clinton County — 64th percentile, Relatively Low
• Franklin County — 65.7th percentile, Relatively Low
• Marion County — 68.1th percentile, Relatively Low
• Jefferson County — 59th percentile, Relatively Low
• Livingston County — 81.1th percentile, Relatively Moderate
• Monroe County — 32.3th percentile, Very Low
• Effingham County — 49.2th percentile, Relatively Low
• Lee County — 62.5th percentile, Relatively Low
• Christian County — 41.5th percentile, Relatively Low
• Morgan County — 61.2th percentile, Relatively Low
• Fulton County — 57.6th percentile, Relatively Low
• Bureau County — 63.4th percentile, Relatively Low
• Randolph County — 57.8th percentile, Relatively Low
• Montgomery County — 58.7th percentile, Relatively Low
• Logan County — 53.7th percentile, Relatively Low
• McDonough County — 21.1th percentile, Very Low
• Iroquois County — 79.6th percentile, Relatively Moderate
• Saline County — 57.4th percentile, Relatively Low
• Jo Daviess County — 58.5th percentile, Relatively Low
• Fayette County — 49.5th percentile, Relatively Low
• Jersey County — 18th percentile, Very Low
• Shelby County — 48.3th percentile, Relatively Low
• Perry County — 49.8th percentile, Relatively Low
• Douglas County — 60.1th percentile, Relatively Low
• Crawford County — 43.7th percentile, Relatively Low
• Hancock County — 24.2th percentile, Very Low
• Union County — 38.9th percentile, Relatively Low
• Piatt County — 43.7th percentile, Relatively Low
• Bond County — 30.5th percentile, Very Low
• Edgar County — 30th percentile, Very Low
• Warren County — 11th percentile, Very Low
• Wayne County — 35.4th percentile, Relatively Low
• Carroll County — 46.5th percentile, Relatively Low
• Richland County — 41.3th percentile, Relatively Low
• De Witt County — 30.3th percentile, Very Low
• Mercer County — 9.2th percentile, Very Low
• Clark County — 31th percentile, Very Low
• Lawrence County — 58.2th percentile, Relatively Low
• Moultrie County — 49.1th percentile, Relatively Low
• Pike County — 33.7th percentile, Very Low
• Massac County — 43th percentile, Relatively Low
• Washington County — 39th percentile, Relatively Low
• Ford County — 35.6th percentile, Relatively Low
• White County — 44.3th percentile, Relatively Low
• Johnson County — 37.9th percentile, Relatively Low
• Clay County — 38.9th percentile, Relatively Low
• Cass County — 28.1th percentile, Very Low
• Mason County — 47.2th percentile, Relatively Low
• Menard County — 29.4th percentile, Very Low
• Marshall County — 35.1th percentile, Relatively Low
• Greene County — 13.2th percentile, Very Low
• Wabash County — 25.8th percentile, Very Low
• Cumberland County — 33.5th percentile, Very Low
• Jasper County — 28.4th percentile, Very Low
• Hamilton County — 12.5th percentile, Very Low
• Schuyler County — 8.2th percentile, Very Low
• Brown County — 4.1th percentile, Very Low
• Henderson County — 24.7th percentile, Very Low
• Edwards County — 21.5th percentile, Very Low
• Putnam County — 19.6th percentile, Very Low
• Stark County — 11.2th percentile, Very Low
• Scott County — 5.1th percentile, Very Low
• Pulaski County — 15.1th percentile, Very Low
• Gallatin County — 36th percentile, Relatively Low
• Alexander County — 40.5th percentile, Relatively Low
• Calhoun County — 16.1th percentile, Very Low
• Pope County — 17.2th percentile, Very Low
• Hardin County — 15.5th percentile, Very Low