Flood zones explained: what each letter on the map means and what it costs
Pick a state and a zone type: the median single-family bill in that zone on July 31, 2026, against the same zone in the whole country.
Median yearly cost, A zones, Florida
$1,161
Single-family policies in force on July 31, 2026, OpenFEMA.
| Same zone type, whole country | $1,197 |
| V zones in Florida | $2,387 |
| X, B, C zones in Florida | $822 |
The zone no longer sets the price under Risk Rating 2.0; it still decides whether a lender must require a policy.
Compiled by Radif Partners · Where the numbers come from · FEMA and OpenFEMA files, rules read in 42 U.S.C. and 44 CFR · not a quote
A flood zone is the letter FEMA gives an area on its Flood Insurance Rate Map. Zones starting with A or V form the Special Flood Hazard Area, land with at least a 1% chance of flooding in any year, which FEMA translates as a 26 % chance over a 30-year mortgage. V zones add wave action on the coast. X (shaded) and B mark moderate hazard, X (unshaded) and C minimal hazard, and D an area nobody has studied. Since Risk Rating 2.0 the letter no longer sets the premium, but it still shows in the bills: on July 31, 2026, the median single-family bill was $1,197 in A zones, $1,796 in V zones and $958 in X, B and C zones. The low-risk letters are not dry ground either: X zones held 43 % of policies and produced 28 % of the single-family claims paid for floods of 2016 to 2025.
Where the letters come from
Every community in the federal program has a Flood Insurance Rate Map, drawn by FEMA from river and coastal studies. The map splits the land into zones, each named by a letter or a short code defined in 44 CFR 64.3. The letters answer two questions: how often water is expected to reach the area, and whether the water arrives with breaking waves. The FEMA glossary groups them into three families: high hazard (the Special Flood Hazard Area, or SFHA), moderate hazard and minimal hazard, plus one family for land never studied.
The SFHA is the area a flood with a 1% chance of being equaled or exceeded in a given year would cover. That flood is the base flood, often called the 100-year flood, a name that misleads: it can happen two years running. Over the 30 years of a typical mortgage, FEMA puts the chance of at least one such flood at 26 %.
The A zones: rivers, lakes and sheltered coast
A zones are high-hazard areas without breaking waves. The plain letter A means FEMA mapped the flood extent without computing a water height. AE (and the older A1 to A30) adds a base flood elevation, the height water is expected to reach, which lets an insurer compare it with the floor of the house. AO marks shallow water, one to three feet deep, or flow paths that cannot be predicted; AH marks the same shallow depths with a computed water elevation. A99 is an area behind a levee or dam still being built but far enough along to count for insurance. AR is an area whose levee lost its accreditation and is being restored.
A zones carry most of the program: 1,553,429 single-family policies on July 31, 2026, 55 % of the total, with a median bill of $1,197.
The V zones: the coastal high hazard area
V and VE zones are the coastal high hazard area: land reached by tidal floods with velocity, where the water moves and strikes rather than only rises. VE has a computed elevation, plain V does not. The price follows that exposure. Only 43,156 single-family policies sit in V zones, yet their median bill, $1,796, is the highest of any zone type, and the same policies at their full-risk price would have a median of $2,619, 1.5 times the current one. Many V-zone bills still have years of capped increases ahead.
X, B, C and D: outside the high-hazard line
X (shaded), formerly B, covers land between the 1% and the 0.2% annual chance flood, the so-called 500-year flood, and areas of future-conditions flood hazard. X (unshaded), formerly C, is land above the 0.2% flood. Older maps still print B and C, and the policy file groups them with X. Zone D means the hazard is possible but no flood hazard analysis was done.
On July 31, 2026, 1,216,179 single-family policies were in X, B or C zones, with a median bill of $958. Those owners buy without a lender forcing them, which is why the median is close to its full-risk level ($1,001): few of these policies were ever deeply discounted.
What the zone decides, and what it no longer does
Under Risk Rating 2.0, FEMA prices each building from its own distance to water, flood types, elevation and rebuilding cost, so two houses on either side of a zone line can pay nearly the same, and two houses in the same AE zone can pay very different amounts. The zone keeps two roles. It decides whether a federally regulated or insured lender must require a policy, explained on the flood insurance requirement page. And a new map that moves a building into an A or V zone opens a short window with a one-day wait and a Newly Mapped discount.
| Zone type | Policies 2026 | Share | Median bill 2026 | Full-risk median | Paid claims 2016 to 2025 |
|---|---|---|---|---|---|
| A | 1,553,429 | 55 % | $1,197 | $1,626 | 262,137 |
| V | 43,156 | 2 % | $1,796 | $2,619 | 8,348 |
| X, B, C | 1,216,179 | 43 % | $958 | $1,001 | 107,488 |
Where the claims come from
Read the last column against the second. A zones hold 55 % of the policies and 69 % of the paid claims, which fits their higher hazard. X zones hold 43 % of the policies and still 28 % of the claims. The share swings by state: in Texas, X zones produced 55 % of the paid single-family claims. Claim size depends on the zone too. In Florida, the median paid claim was $68,132 in A zones, $36,806 in V zones and $26,617 in X zones.
Median claim against your bill, by state
Median single-family claim paid in Texas, 2016 to 2025
$71,152
| Years of the bill entered that one median claim equals | 66 |
| Median claim, whole country | $42,494 |
| Average claim, whole country | $70,978 |
To see the zone mix of one place, the ZIP code lookup gives the median bill of a ZIP or county; FloodSmart explains how to find the zone printed for an address.