Manassas city, VA flood risk explained
Flood hazard in Manassas city sits at the 31.7th national percentile, 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 2 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 Manassas city'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, 0.4% of all residential structures in Manassas city carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Manassas city ranks
Among the 3144 US counties FEMA scores for flood hazard, Manassas city ranks 2204 — 1 being the highest hazard nationally — and 1126 by population among all 3144 counties covered here, where 1 is the largest. Manassas city, Virginia covers 9.843 square miles and counts roughly 43,616 residents.
Your street may differ from Manassas city's average
43 of Manassas city's 11,906 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Manassas city's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Manassas city'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.