Data downloads & API

All SkyGround data is available for download and programmatic access. Every record pre-merges FEMA risk scores for all 18 hazard types, NOAA storm event counts, deaths and damage for 11 tracked hazards, CDC Social Vulnerability Index, federal disaster declarations, USFS wildfire projections, and space weather data — one row per county, no joins required.

County dataset (CSV)

Flat file covering all 3,232 US counties and county-equivalents. FEMA NRI hazard scores, NOAA storm events with deaths and property damage, CDC SVI (2022), disaster declaration history, USFS wildfire projections, and geomagnetic latitude.

104 fields · 3,232 rows · UTF-8 · Updated with each data refresh

Download CSV

CSV field reference

Field	Description	Source
fips	5-digit county FIPS code (state + county)	Census / FEMA
county	County name (without type suffix)	FEMA NRI
county_type	Jurisdiction type: County, Parish, Borough, Census Area, Municipio, etc.	FEMA NRI
state	Full state name	FEMA NRI
state_abbr	2-letter state abbreviation	FEMA NRI
population	County population used by FEMA NRI	FEMA NRI
overall_score	Composite NRI score (0–100 percentile). Blank = insufficient data.	FEMA NRI v1.20.0
overall_rating	Composite NRI rating band: Very Low / Relatively Low / Relatively Moderate / Relatively High / Very High / Insufficient Data / Not Applicable	FEMA NRI v1.20.0
wildfire_score / wildfire_rating inland_flooding_score / inland_flooding_rating coastal_flooding_score / coastal_flooding_rating earthquake_score / earthquake_rating heat_wave_score / heat_wave_rating tornado_score / tornado_rating hurricane_score / hurricane_rating hail_score / hail_rating strong_wind_score / strong_wind_rating winter_weather_score / winter_weather_rating ice_storm_score / ice_storm_rating cold_wave_score / cold_wave_rating lightning_score / lightning_rating drought_score / drought_rating landslide_score / landslide_rating avalanche_score / avalanche_rating tsunami_score / tsunami_rating volcanic_activity_score / volcanic_activity_rating	NRI score (0–100 percentile) and rating band for each of the 18 hazard types. Blank score = Insufficient Data or Not Applicable.	FEMA NRI v1.20.0
noaa_events_wildfire_2016_2026 noaa_events_inland_flooding_2016_2026 noaa_events_heat_wave_2016_2026 noaa_events_tornado_2016_2026 noaa_events_drought_2016_2026 noaa_events_hail_2016_2026 noaa_events_hurricane_2016_2026 noaa_events_landslide_2016_2026 noaa_events_lightning_2016_2026 noaa_events_strong_wind_2016_2026 noaa_events_winter_weather_2016_2026	Recorded event counts per hazard, 2016–2026. 10 hazards are county-level (CZ_TYPE=C); heat wave is zone-level (CZ_TYPE=Z), assigned to counties via a zone-to-county crosswalk. 6 hazards use zone-level reporting with no crosswalk and are excluded (see methodology).	NOAA Storm Events Database
noaa_deaths_*_2016_2026 (same 11 hazards)	Total direct + indirect deaths attributed to each hazard in the county, 2016–2026	NOAA Storm Events Database
noaa_injuries_*_2016_2026 (same 11 hazards)	Total direct + indirect injuries attributed to each hazard, 2016–2026	NOAA Storm Events Database
noaa_property_damage_usd_*_2016_2026 (same 11 hazards)	Property damage in USD per hazard, 2016–2026. Parsed from NOAA coded format ("5.00K" → 5000, "1.50M" → 1500000)	NOAA Storm Events Database
fema_declarations_total	Total federal disaster declarations listing this county, all years on record	FEMA OpenFEMA
fema_declarations_first_year fema_declarations_last_year	Year range of declaration history	FEMA OpenFEMA
fema_declarations_most_recent_type fema_declarations_most_recent_year	Incident type and year of most recent declaration	FEMA OpenFEMA
svi_overall	Overall Social Vulnerability Index percentile (0–1). Higher = more vulnerable. Null for US territories not covered by CDC SVI.	CDC/ATSDR SVI 2022
svi_socioeconomic	SVI Theme 1 — Socioeconomic status (poverty, unemployment, income, education)	CDC/ATSDR SVI 2022
svi_household	SVI Theme 2 — Household characteristics (age, disability, single-parent households, English language proficiency)	CDC/ATSDR SVI 2022
svi_minority	SVI Theme 3 — Racial & ethnic minority status	CDC/ATSDR SVI 2022
svi_housing	SVI Theme 4 — Housing type & transportation (mobile homes, crowding, multi-unit structures, vehicle access)	CDC/ATSDR SVI 2022
usfs_bp_national_rank	National percentile rank (0–1) for wildfire burn probability. Higher = more likely to burn relative to all US counties. From USFS Wildfire Risk to Communities model.	USFS Wildfire Risk to Communities
usfs_risk_national_rank	National percentile rank (0–1) for risk to homes from wildfire. Accounts for burn probability, flame length, and structure exposure.	USFS Wildfire Risk to Communities
usfs_buildings_fraction_direct_exposure	Fraction of the county's buildings in the direct fire exposure zone (flame contact or ember cast likely).	USFS Wildfire Risk to Communities
geomagnetic_latitude	Approximate geomagnetic latitude of county centroid (dipole model, ~1° accuracy for CONUS). See methodology.	Census Bureau centroid + IGRF dipole
aurora_kp_threshold	Lowest planetary K-index at which aurora is typically visible from this county (null if geomagnetic latitude is too low for aurora even at Kp 9)	NOAA SWPC Kp table + geomagnetic latitude
skyground_url	Permalink to this county's page on SkyGround	SkyGround

Per-county JSON API

Each county has a static JSON endpoint at a stable URL. No authentication, no rate limits, no API key required — these are pre-built static files.

GET https://skyground.app/api/county/{fips}.json

Replace {fips} with any 5-digit county FIPS code. Example: /api/county/06037.json (Los Angeles County, CA)

Example response (Los Angeles County, CA)

{
  "fips": "06037",
  "county": "Los Angeles",
  "county_type": "County",
  "state": "California",
  "state_abbr": "CA",
  "population": 9829544,
  "skyground_url": "https://skyground.app/risk/los-angeles-county-ca",
  "nri": {
    "version": "1.20.0",
    "release": "2025-12",
    "overall": { "score": 95.2, "rating": "Very High" },
    "hazards": {
      "wildfire":         { "score": 98.1, "rating": "Very High" },
      "inland_flooding":  { "score": 78.4, "rating": "Relatively High" },
      "coastal_flooding": { "score": 71.2, "rating": "Relatively Moderate" },
      "earthquake":       { "score": 96.3, "rating": "Very High" },
      "heat_wave":        { "score": 85.0, "rating": "Relatively High" },
      "tornado":          { "score": 12.1, "rating": "Very Low" }
    }
  },
  "noaa_storm_events": {
    "year_range": [2016, 2026],
    "note": "County-level records only (CZ_TYPE=C). Earthquakes not tracked by NOAA.",
    "by_hazard": {
      "wildfire":         { "events": 42, "deaths": 5, "injuries": 12, "property_damage_usd": 4200000000, "crop_damage_usd": 0 },
      "inland_flooding":  { "events": 87, "deaths": 3, "injuries": 8,  "property_damage_usd": 120000000,  "crop_damage_usd": 0 },
      "coastal_flooding": { "events": 12, "deaths": 0, "injuries": 1,  "property_damage_usd": 5000000,    "crop_damage_usd": 0 },
      "heat_wave":        { "events": 14, "deaths": 9, "injuries": 31, "property_damage_usd": 0,          "crop_damage_usd": 0 },
      "tornado":          { "events": 3,  "deaths": 0, "injuries": 0,  "property_damage_usd": 25000,      "crop_damage_usd": 0 }
    }
  },
  "fema_declarations": {
    "total": 88,
    "first_year": 1969,
    "last_year": 2025,
    "most_recent": { "year": 2025, "type": "Fire", "title": "WILDFIRES AND STRAIGHT-LINE WINDS" },
    "by_type": { "Fire": 61, "Flood": 10, "Severe Storm(s)": 8, "Earthquake": 6, "Other": 3 }
  },
  "social_vulnerability": {
    "year": 2022,
    "source": "CDC/ATSDR",
    "overall": 0.7321,
    "socioeconomic": 0.6892,
    "household": 0.7104,
    "minority": 0.9143,
    "housing": 0.6530
  },
  "climate_projections": {
    "wildfire": {
      "bp_national_rank": 0.8870,
      "risk_national_rank": 0.9120,
      "buildings_fraction_direct_exposure": 0.2341
    },
    "flood": null,
    "heat": null,
    "sources": {
      "wildfire": { "name": "USFS Wildfire Risk to Communities", "citation": "RDS-2020-0016-2 (2020)" },
      "flood":    { "name": "First Street Foundation", "status": "pending_research_agreement" },
      "heat":     { "name": "First Street Foundation", "status": "pending" }
    }
  },
  "space_weather": {
    "geomagnetic_latitude": 40.4,
    "aurora_kp_threshold": null,
    "aurora_storm_label": null
  }
}

Joining with other datasets

CDC SVI (2022) and USFS Wildfire Risk to Communities projections are already included in the download. The fips field also joins cleanly with:

EPA EJScreen — environmental burden percentiles (ID field)
Census ACS — demographics, income, housing (GEOID field)
USDA ERS Rural-Urban Continuum Codes — county classification (FIPS field)
FEMA NFIP Claims — flood insurance claim history (countyCode field)
SBA Disaster Loans — disaster loan amounts (countyFIPSCode field)
First Street Foundation — flood and heat risk projections to 2050 (requires research agreement at firststreet.org/data-access)

All FIPS codes use the standard 5-digit format (zero-padded state + county), consistent with Census Bureau conventions.

Citation

When using this data, cite the underlying sources directly. The primary source for risk scores is FEMA's National Risk Index (v1.20.0, December 2025, hazards.fema.gov/nri). You may additionally reference SkyGround as the presentation and aggregation source: SkyGround (skyground.app).