Property Flood
Zone Lookup Open on RapidAPI

A point on the map. An answer you can inspect.

FEMA flood zone data for a single address.

Turn a U.S. street address or latitude and longitude into the effective FEMA flood zone, Special Flood Hazard Area flag, and matching map panel. Every answer names its source and capture time.

Get an API keySee a response

Independent service using FEMA data. Not affiliated with or endorsed by FEMA.

Map facts, with the edges left visible.

The API reports what FEMA’s current effective map returns at the point. It also preserves uncertainty instead of converting missing data into a reassuring label.

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Address or coordinates

Use a street address through the U.S. Census Geocoder, or provide verified latitude and longitude directly.

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Zone and SFHA flag

Get the FEMA zone code, zone subtype, and Special Flood Hazard Area flag when a polygon covers the point.

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Matching FIRM panel

Get the panel number and effective date when FEMA returns a unique panel matching that zone’s map ID.

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Traceable source

Each answer includes FEMA source links, capture time, and a request ID. Unmapped, unknown, and ambiguous results are explicit.

One request. A useful answer.

The same endpoint accepts either a street address or a point. The example below uses a point in Washington, DC.

Read the OpenAPI reference
GET/v1/flood-zone?lat=38.8987&lon=-77.0352
{
  "result": {
    "status": "mapped",
    "floodZone": "X",
    "zoneSubtype": "AREA OF MINIMAL FLOOD HAZARD",
    "specialFloodHazardArea": false,
    "mapPanel": {
      "number": "1100010018C",
      "effectiveDate": "2010-09-27"
    }
  },
  "source": {
    "name": "FEMA National Flood Hazard Layer",
    "capturedAt": "..."
  }
}

Direct from the effective map.

Flood zone polygons and FIRM panels come from FEMA’s National Flood Hazard Layer map service. Address coordinates come from the U.S. Census Geocoder. We cache complete map answers for up to 24 hours and show when FEMA was queried.

FEMA NFHL map serviceFEMA Map Service CenterU.S. Census Geocoder

Start free. Scale when you need to.

Every plan returns the same fields. Monthly request limits are hard caps; there are no overage charges at launch. RapidAPI shows the current subscription terms.

Basic

Free

100 requests / month

Pro

$9 / month

2,000 requests / month

Ultra

$29 / month

10,000 requests / month

Mega

$99 / month

50,000 requests / month

See plans on RapidAPI

One lookup is one request. Upstream data and map coverage can change.

Before you use a result

Flood maps are one input to property research. These distinctions matter.

Is this a formal flood determination?

No. This independent lookup provides informational map context. It is not a Standard Flood Hazard Determination, insurance quote, or lending decision.

What do “unmapped” and “unknown” mean?

Unmapped means FEMA's availability and zone layers returned no polygon at the point. Unknown means no zone polygon was returned but map coverage may exist or could not be verified. Neither establishes low flood risk. Check the FEMA Map Service Center and local sources.

How precise is an address lookup?

The Census Geocoder can place an address along a street segment. Near a flood zone boundary, use verified parcel or rooftop coordinates and review FEMA’s map.

What if FEMA’s polygons overlap?

The API returns ambiguous with candidate zones and does not choose a single flood zone. A panel is returned only when it uniquely matches the selected zone’s map ID.