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Highest risk cities in Illinois

Highest flood risk cities in Illinois

Ranked city list for flood-prone areas, based on 1454/1454 eligible cities evaluated. Open any city to view local risk details and live outlook context.

P85-based state reference

Flood score

52/100

Updated Thu, Sep 24, 8:59 PM.

1454/1454 eligible cities evaluated

Open flood outlook Browse all IL cities

More state ranking pages

Highest overall weather risk cities Highest wind risk cities Highest air quality risk cities Highest lightning risk cities Highest wildfire risk cities Highest tornado risk cities

National comparisons:

Which state has the highest hurricane risk? →Which states have the highest AQI risk? →Which states have the highest wildfire risk? →Safest states for severe weather →States with the lowest flood exposure →

Ranked cities

Top 25 cities by flood score from 1454 evaluated locations.

Open any city for full details

#1

Cairo, IL

48 points above the state reference

#2

Hillsdale, IL

48 points above the state reference

#3

Meredosia, IL

48 points above the state reference

#4

Mound City, IL

48 points above the state reference

#5

Olmsted, IL

48 points above the state reference

#6

Lawrenceville, IL

47 points above the state reference

#7

Liverpool, IL

47 points above the state reference

#8

Hennepin, IL

45 points above the state reference

#9

Erie, IL

43 points above the state reference

#10

Ina, IL

43 points above the state reference

#11

Nason, IL

43 points above the state reference

#12

Hillview, IL

40 points above the state reference

#13

Deer Grove, IL

38 points above the state reference

#14

New Haven, IL

38 points above the state reference

#15

Harrisburg, IL

36 points above the state reference

#16

Muddy, IL

36 points above the state reference

#17

Naples, IL

36 points above the state reference

#18

Valley City, IL

36 points above the state reference

#19

Bluffs, IL

32 points above the state reference

#20

Germantown, IL

32 points above the state reference

#21

Oxville, IL

32 points above the state reference

#22

Carrier Mills, IL

31 points above the state reference

#23

Bartelso, IL

27 points above the state reference

#24

Colp, IL

27 points above the state reference

#25

Eldred, IL

27 points above the state reference

How this ranking works

Rankings use HomeRiskIQ weather risk data across1454/1454 eligible cities evaluated.

Scores are normalized to a 0-100 scale. The state benchmark is a p85-based state reference, not an arithmetic average.

City entries link to hazard-specific pages where available, otherwise to the city overview.