How much flood risk does Brazoria County actually carry?
Brazoria County lands at the 94.4th percentile of FEMA's National Risk Index for flooding, "Relatively High" territory — well above the national norm for flood hazard — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.9 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Brazoria County's flood-insurance compliance gap
42.8% of the homes FEMA requires to carry flood insurance in Brazoria County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 11,347 policies against 26,528 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Brazoria County, not just the ones FEMA mandates, 22.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Brazoria County ranks
Brazoria County sits at rank 192 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 185 of 3144 by population (1 is biggest). Brazoria County, Texas covers 1,363.318 square miles and counts roughly 413,224 residents.
Checking a specific address in Brazoria County
27,418 of Brazoria County's 121,737 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Brazoria County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.