ZIP 63373
St. Charles County, MO

The heaviest year

1993 is the heaviest year on file: 272 paid claims, 24.4% of the ZIP's total. The rest is spread across the other 36 years on file. The largest named event in the record is Midwest Flooding, with 209 claims.

149 of those claims — 13.4% — were filed since 2017. The bulk of this ZIP's record is older than that.

Named event	Paid claims	Share of record
Midwest Flooding	209	18.8%
Not a named storm	61	5.5%

Where the claims sat on the map

Of the 1,102 claims here that record a rated flood zone, 25 — 2.3% — were on properties rated outside the mapped high-risk area, in a B, C or X zone. Claims here concentrate inside the mapped high-risk area, which is what the maps intend. Flood insurance is not required outside the high-risk zone, and most properties there do not carry it — so these counts come from the minority who did.

The water near this ZIP

The closest gauges publishing official flood thresholds are Mississippi River at Grafton (3.5 mi), Missouri River at St. Charles (10.7 mi) and Mississippi River at Alton (11.2 mi). A gauge describes one point on one river — it will not see street drainage, sewer backup, storm surge or flash flooding.

Read current gauge conditions for 63373 →

What this does not say

These are paid National Flood Insurance Program claims, nothing more. They count insured properties whose owners filed and were paid, so they are a floor on how often this ZIP has flooded — never a measure of how likely it is to flood next. Uninsured flooding leaves no trace here at all.

The figures are aggregates published by FEMA. No individual claim, address or policyholder appears on this page or in the data behind it. Nothing here is a forecast, a warning, or advice about insurance.