How much flood risk does Calvert County actually carry?
Calvert County lands at the 59.4th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard driven by coastal storm surge rather than inland rivers — FEMA's model puts a surge event here at about 3.6 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Calvert County
Out of 560 homes FEMA counts inside Calvert County's mapped flood zone, 354 carry the flood policy federal law requires there — 63.2% compliance, short of full coverage. Across all residential structures in Calvert County, not just the ones FEMA mandates, 2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Calvert County compares nationally
Calvert County sits at rank 1334 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 650 of 3144 by population (1 is biggest). About 94,913 people live in Calvert County, Maryland, spread over 213.19 square miles.
What to do next if you own or are buying in Calvert County
Across all of Calvert County's 35,014 residential structures, 699 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Calvert County's numbers. Because storm surge plays a real role here, the guide to coastal vs. inland flood hazard is worth reading alongside this page.