Flood zone
The letter code FEMA assigns to an area on a flood map to describe its mapped flood risk.
FEMA’s Flood Insurance Rate Maps divide land into zones. The ones a land buyer meets most often:
A and AE — inside the Special Flood Hazard Area. AE means FEMA has calculated a base flood elevation there; plain A means it has not, which leaves you or your engineer to work one out. V and VE are coastal areas that also face wave action. X (shaded), sometimes shown as B, is moderate risk, roughly the 0.2%-annual-chance or “500-year” floodplain. X (unshaded), sometimes C, is minimal mapped risk. D means the risk has not been studied.
Why it matters
The zone decides whether flood insurance is mandatory for a mortgage, how a building must be constructed, and often what the insurance costs. Remember what the map is: a model at a fixed date and scale. Zone X does not mean a parcel cannot flood — many flood insurance claims come from outside mapped high-risk areas.
Sources
Related terms
- Special Flood Hazard Area (SFHA)
Land FEMA maps as having at least a 1% chance of flooding in any given year — the "100-year floodplain".
- Base flood elevation (BFE)
The height floodwater is expected to reach in a 1%-annual-chance flood, used to set building heights.
Articles on this topic
- How to research a property yourself, step by stepMay 20, 2026
- Why you should analyze land before you buy itMarch 12, 2026
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