How much flood risk does Worcester County actually carry?
Worcester County lands at the 95.3th percentile of FEMA's National Risk Index for flooding, "Relatively High" territory — well above 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 3.8 times a year. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Worcester County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Worcester County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 64.9% of them do — 655 active policies against 1,010 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Worcester County, not just the ones FEMA mandates, 0.5% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Worcester County compares nationally
Worcester County sits at rank 160 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 69 of 3144 by population (1 is biggest). Worcester County, Massachusetts is home to about 881,248 people across 1,510.67 square miles of land.
Your street may differ from Worcester County's average
Across all of Worcester County's 209,146 residential structures, 1,081 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 Worcester County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.