Flood map coverage in Guam

FEMA's National Flood Hazard Layer holds 43 FIRM panels for Guam from 1 digital flood map database. Computed September 29, 2026.

43FIRM panels

100%took effect before September 29, 2016

2007-09-28newest panel (6600010069D)

0LOMRs in effect

What to expect from lookups here

The Census county list has no county equivalents for Guam; the map above covers the territory.
The map that has gone longest without a new panel is Guam (660001), last revised 2007-09-28.

A real lookup in Guam

The point is the center of FIRM panel 6600010069D, Guam's most recently effective printed panel. FEMA's map puts it in zone X (area of minimal flood hazard). Recorded September 29, 2026.

Request

curl -sG https://api.floodzoneapi.com/api/v1/flood/zone \
  -H "Authorization: Bearer $FZA_KEY" \
  -d lat=13.4323 -d lon=144.6875

Response 200

{
  "query": {
    "lat": 13.4323,
    "lon": 144.6875
  },
  "location": {
    "lat": 13.4323,
    "lon": 144.6875,
    "geocoder": null,
    "precision": "input_coordinates",
    "matched_address": null,
    "candidates": null,
    "county": null,
    "county_fips": null,
    "state": null
  },
  "flood_zone": {
    "mapped": true,
    "zone": "X",
    "subtype": "AREA OF MINIMAL FLOOD HAZARD",
    "description": "Area of minimal flood hazard. Outside the Special Flood Hazard Area.",
    "sfha": false,
    "static_bfe": null,
    "depth": null,
    "dfirm_id": "660001",
    "polygon_id": "660001_444",
    "at_zone_boundary": false,
    "other_zones": []
  },
  "firm_panel": {
    "panel": "6600010069D",
    "effective_date": "2007-09-28",
    "panel_type": "Community Based, Panel Printed",
    "dfirm_id": "660001",
    "other_panels": []
  },
  "source": {
    "dataset": "FEMA National Flood Hazard Layer (NFHL)",
    "service": "https://hazards.fema.gov/arcgis/rest/services/public/NFHL/MapServer",
    "layers": [
      {
        "id": 28,
        "name": "Flood Hazard Zones"
      },
      {
        "id": 3,
        "name": "FIRM Panels"
      }
    ],
    "query_point": {
      "lat": 13.4323,
      "lon": 144.6875
    },
    "queried_at": "2026-09-29T08:36:52Z",
    "cached": true,
    "cache_ttl_seconds": 86400
  },
  "notice": "Informational. This is the zone shown on FEMA's effective flood map (NFHL) at this point. It is not a Standard Flood Hazard Determination (FEMA Form 086-0-32), a prediction of flood risk, or an insurance quote, and it does not reflect a Letter of Map Amendment issued for a single structure."
}

Every digital flood map in Guam

Dates are panel effective dates (YYYY-MM-DD). "Placeholder" means FEMA's record carries a non-date such as 9999-09-09. "Over 10 years old" counts panels effective before September 29, 2016. "LOMRs in effect" are Letters of Map Revision not yet folded into a new FIRM. The DFIRM ID appears in responses as `flood_zone.dfirm_id` and `firm_panel.dfirm_id`.
Map	DFIRM ID	ID type	Panels	Newest panel	Oldest panel	Over 10 years old	LOMRs in effect
Guam	660001	Community-numbered	43	2007-09-28	2007-09-28	43	0

Source: FEMA NFHL layers 1, 3 and 22 and the Census Bureau county gazetteer, computed September 29, 2026. All states · API reference