City vs city
O'Fallon vs Saint Louis, MO
O'Fallon currently scores 10 points higher overall than Saint Louis, with the largest gap in flood.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
O'Fallon: 46/100 · Saint Louis: 36/100
O'Fallon is 10 points higher.
Flood
O'Fallon: 44/100 · Saint Louis: 7/100
O'Fallon is 37 points higher.
O'Fallon: FEMA NFHL flood zones: 6 features intersect this tile.
Saint Louis: FEMA NFHL flood zones: 4 features intersect this tile.
Wind
O'Fallon: 16/100 · Saint Louis: 16/100
No gap.
O'Fallon: Wind exposure derived from ingested design wind / climatology tiles.
Saint Louis: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
O'Fallon: 46/100 · Saint Louis: 37/100
O'Fallon is 9 points higher.
O'Fallon: Lightning exposure derived from ingested climatology tiles.
Saint Louis: Lightning exposure derived from ingested climatology tiles.
Tornado
O'Fallon: 50/100 · Saint Louis: 35/100
O'Fallon is 15 points higher.
O'Fallon: Tornado risk derived from NOAA SPC historical reports.
Saint Louis: Tornado risk derived from NOAA SPC historical reports.
Hail
O'Fallon: 100/100 · Saint Louis: 100/100
No gap.
O'Fallon: Hail risk derived from NOAA SPC historical reports.
Saint Louis: Hail risk derived from NOAA SPC historical reports.
Storm surge
O'Fallon: Unavailable · Saint Louis: Unavailable
A score difference cannot be calculated without both sources.
O'Fallon: Storm surge model is not available for this location yet.
Saint Louis: Storm surge model is not available for this location yet.
Wildfire
O'Fallon: 41/100 · Saint Louis: 29/100
O'Fallon is 12 points higher.
O'Fallon: Wildfire exposure derived from ingested fire potential tiles.
Saint Louis: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
O'Fallon: 28/100 · Saint Louis: 28/100
No gap.
O'Fallon: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Saint Louis: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.