Guide · Flood zones
What flood zone AE, X or VE means in Florida
AE, A, AH, AO and VE all sit inside FEMA's Special Flood Hazard Area, land with a 1% chance of flooding in any year, and there a federally backed mortgage requires flood insurance. AE, AH and VE come with a base flood elevation; A does not, and VE adds storm waves. X is outside that area (shaded X is the 0.2% band, unshaded X lies above it), and D means FEMA never studied the risk.
The letters, one by one
A zone is a label FEMA prints on its Flood Insurance Rate Map. The first letter tells you the risk class: an A or a V is high risk, X is not. The second letter tells you how much FEMA studied the place. These are FEMA's own definitions, from its glossary and FloodSmart, set beside how many Florida parcels each zone covers on our map.
| Zone | What FEMA says it is | Base flood elevation | Florida parcels |
|---|---|---|---|
| AE | The floodplain where detailed study produced flood heights. It replaced the old A1 to A30 labels. | Shown | 1,135,892 |
| A | A 1% yearly chance of flooding, but no detailed analysis was done. | Not shown | 265,221 |
| AH | Shallow flooding that ponds, usually 1 to 3 feet deep. | Shown | 217,941 |
| AO | Shallow flooding that runs off as a sheet, shown as a depth instead of a height. | Depth in feet | 3,765 |
| VE | Coastal land with a 1% yearly chance of flooding plus the added hazard of storm waves. | Shown | 37,625 |
| X | Outside the high-risk area. Shaded X lies between the 1% and 0.2% (500-year) lines; unshaded X is higher than the 0.2% flood. | None | 7,446,943 |
| D | Possible flood risk that has not been determined, because no analysis was made. | None | 13,788 |
Counted by the zone under each parcel on 31 October 2026. In all, 1,660,452 parcels fall in a high-risk zone, 18.0% of the 9,199,799 we place on the flood map.
Base flood elevation, in plain words
FEMA calls the 1% annual chance flood the base flood. Its base flood elevation is the height the water would reach in it, printed on the map for zones like AE, AH and VE. What matters for a building is how far its lowest floor sits above or below that line. A surveyor measures that on an elevation certificate; the map alone cannot tell you.
Zone A has no such height. FEMA did not run a detailed analysis there, so its map gives neither a depth nor an elevation. FEMA puts the odds for A and VE the same way: a 26% chance of flooding over a 30-year mortgage.
Where you meet each zone in Florida
The coast and the interior get very different maps. Near salt water, the floodplain is mostly AE with a strip of VE on the open shore. Inland, a large share of the floodplain is plain A, which means the risk is mapped but its depth is not.
| County | Parcels mapped | In a high-risk zone | Share of those in zone A |
|---|---|---|---|
| Monroe (the Keys) | 81,468 | 91.9% | 0% |
| Lee | 463,747 | 30.7% | 1.7% |
| Pinellas | 326,477 | 25.2% | 3.8% |
| Polk | 414,796 | 11.7% | 74.8% |
| Marion | 280,214 | 5.5% | 67.3% |
| Alachua | 100,471 | 5.1% | 70.0% |
| Orange | 437,032 | 4.9% | 28.8% |
- VE appears in 35 counties. Monroe has the most parcels in it (7,038), then Franklin (4,460) and Wakulla (2,719) on the Big Bend coast.
- D is rare and concentrated: 11,818 of the state's 13,788 D parcels are in Charlotte County.
- AO is rarer still. Palm Beach County holds 1,861 of the 3,765 parcels in it.
What the zone means for a purchase
- Any A or V zone: in a community that takes part in the National Flood Insurance Program, flood insurance is mandatory for a federally backed mortgage, as FloodSmart states it.
- X or D: no federal requirement, though FEMA still recommends a policy. A buyer's own loan terms can ask for one anyway.
- AE, AH or VE: ask the seller for an elevation certificate, and compare the lowest floor with the base flood elevation.
- Zone A: there is no published height to compare with, so ask the county's floodplain office what it requires before you plan to build.
To look the zone up for one address, and to check the storm surge and evacuation zones beside it, see how to check a Florida property's flood zone and storm surge zone.
Where this stops
- Our zone field holds FEMA's letter only. It does not split shaded from unshaded X, and it does not show the base flood elevation itself: read those on FEMA's map panel.
- A Letter of Map Change can take one building out of the high-risk area after the map was printed. Those letters sit with FEMA, not on the flood layer.
- A zone describes the land, not the building. Two houses on the same street in AE can sit at very different heights.
On Map Views
A parcel's report gives its FEMA zone, says whether it lies in the 100-year floodplain, and lists each zone's share of the lot when the line crosses it. The flood layer draws the zones over streets or the county's aerials, and the FIRM panel layer shows which panel to open on FEMA's site.
FEMA's effective Flood Insurance Rate Map is the authority on a parcel's zone. Our layer is drawn from FEMA's National Flood Hazard Layer; check the panel on FEMA's Map Service Center before a purchase or a policy depends on it.