How much flood risk does Cortland County actually carry?
Cortland County lands at the 71.9th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below 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 1.9 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Cortland County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Cortland 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, 21.2% of them do — 201 active policies against 950 structures FEMA counts in that zone, leaving a real compliance gap. Across all residential structures in Cortland County, not just the ones FEMA mandates, 1.3% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Cortland County compares nationally
Cortland County sits at rank 921 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 1071 of 3144 by population (1 is biggest). About 45,945 people live in Cortland County, New York, spread over 498.774 square miles.
What to do next if you own or are buying in Cortland County
Across all of Cortland County's 17,104 residential structures, 219 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 Cortland 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.