North Slope Borough, AK flood risk explained
Flood hazard in North Slope Borough sits at the 2.6th national percentile, not rated by FEMA’s risk index; split between inland river flooding (about once every 28 years) and coastal storm surge (about once every Infinity 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
FEMA hasn't published a residential structure count for North Slope Borough's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 0.1% of all residential structures in North Slope Borough carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How North Slope Borough compares nationally
Among the 3144 US counties FEMA scores for flood hazard, North Slope Borough ranks 3067 — 1 being the highest hazard nationally — and 2368 by population among all 3144 counties covered here, where 1 is the largest. North Slope Borough, Alaska covers 88,792.783 square miles and counts roughly 10,663 residents.
Your street may differ from North Slope Borough's average
FEMA counts 1,337 residential structures in North Slope Borough overall, 1 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where North Slope Borough's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. North Slope Borough's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.