The information contained in this map is for REFERENCE ONLY. The flood areas shown were provided by FEMA as a non-NFHL dataset. For official flood map products and detailed information you can visit the FEMA web site at

To search for your address, enter the house number and the first part of the street name. (ex: 100 N or 2650 Tri) The search will find the closest matching addresses to what you type so you do not need to enter the full street address. When you see the address you want to look-up, just select it from the list. You can also just zoom and pan around to find the area you want to look at.

Signs available to raise awareness of flood risks

Do live near a flood plain? You can help spread the word about flood risks The State of Missouri is offering unique flood awareness signs that can be posted to help educate the public on the risks of flooding. To see if you qualify, please contact the City of O’Fallon’s Flood Plain Administrator Jeannie Greenlee at

Floodplain Map Legend

Learn more about Floodplain Management