How much flood risk does Castro County actually carry?
Castro County lands at the 11.2th percentile of FEMA's National Risk Index for flooding, "Very Low" territory — among the lowest flood hazard in the country — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
Castro County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Castro County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Castro County ranks
Castro County sits at rank 2810 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2628 of 3144 by population (1 is biggest). About 7,380 people live in Castro County, Texas, spread over 894.444 square miles.
Checking a specific address in Castro County
Across all of Castro County's 2,570 residential structures, 4 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 Castro County's numbers. See the data quality guide for why Castro County, like hundreds of other counties, doesn't get a clean compliance percentage.