Is Oglala Lakota County, SD in a flood zone?
FEMA's National Risk Index puts Oglala Lakota County's flood hazard at the 19th percentile nationally — among the lowest flood hazard in the country — 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. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Oglala Lakota County's flood-insurance compliance gap
Oglala Lakota 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 Oglala Lakota County, not just the ones FEMA mandates, 0% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Oglala Lakota County against the rest of the country
Oglala Lakota County sits at rank 2587 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2200 of 3144 by population (1 is biggest). Oglala Lakota County, South Dakota covers 2,093.601 square miles and counts roughly 13,360 residents.
Your street may differ from Oglala Lakota County's average
Across all of Oglala Lakota County's 3,321 residential structures, 0 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 Oglala Lakota County's numbers. See the data quality guide for why Oglala Lakota County, like hundreds of other counties, doesn't get a clean compliance percentage.