How much flood risk does Anchorage Municipality actually carry?
Anchorage Municipality lands at the 28th 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 coastal storm surge rather than inland rivers — FEMA's model puts a surge event here at about once every 83 years. 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 Anchorage Municipality
Anchorage Municipality 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 Anchorage Municipality, not just the ones FEMA mandates, 0.4% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Anchorage Municipality ranks
Anchorage Municipality sits at rank 2313 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 254 of 3144 by population (1 is biggest). About 289,600 people live in Anchorage Municipality, Alaska, spread over 1,706.802 square miles.
What to do next if you own or are buying in Anchorage Municipality
Across all of Anchorage Municipality's 77,875 residential structures, 305 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 Anchorage Municipality's numbers. See the data quality guide for why Anchorage Municipality, like hundreds of other counties, doesn't get a clean compliance percentage.