How much flood risk does Gillespie County actually carry?
Gillespie County lands at the 68.1th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below 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 3 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.
Who actually carries the flood insurance FEMA requires
Gillespie 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 Gillespie County, not just the ones FEMA mandates, 1.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Gillespie County compares nationally
Gillespie County sits at rank 1047 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1504 of 3144 by population (1 is biggest). Gillespie County, Texas covers 1,058.205 square miles and counts roughly 28,159 residents.
Checking a specific address in Gillespie County
Across all of Gillespie County's 12,539 residential structures, 153 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 Gillespie County's numbers. See the data quality guide for why Gillespie County, like hundreds of other counties, doesn't get a clean compliance percentage.