Where are the Flood Insurance Policies in the US?

Only 390 counties in the US hold about 90% of the National Flood Insurance Program (NFIP) flood insurance policies.

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To put that in perspective, there are about 3,144 county and county equivalent areas in the US.  Therefore, about 12% of the counties hold about 90% of the flood insurance policies.  And there are about 169 million people living in those counties, which is 54% of the US population.