US Address Geocoder – Census Tract & Flood

What it does

US Address Geocoder – Census Tract & Flood turns US street addresses into coordinates and Census geographies with the official US Census Bureau geocoder: the standardised matched address, latitude/longitude, state and county FIPS codes, census tract, block group and block, the congressional and state legislative districts, place, ZCTA, metro area and school district. Add the FEMA flood zone of each address (zone, Special Flood Hazard Area flag, base flood elevation, FIRM panel and its effective date) with one switch. Built for real estate, insurance, lending, public-sector and data teams who need tract-level joins or flood screening without a GIS stack. $3 per 1,000 matched addresses, plus $2 per 1,000 flood zones; addresses the Census cannot match are free.

Price per delivered record

Apify free plan: up to 10 items per run. Paid plans have no per-run cap; set maxTotalChargeUsd to cap spend.

Call it from code, an agent or the Console

This API is private on Apify for now. Email us and we will publish it for you, usually within two working days. The calls below work once it is public. contact@sfoln.com

curl -X POST "https://api.apify.com/v2/actors/sfoln~us-address-enrichment/run-sync-get-dataset-items" \
  -H "Authorization: Bearer $APIFY_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"addresses":["1600 Pennsylvania Ave NW, Washington, DC 20500"]}'

{
  "mcpServers": {
    "apify": {
      "type": "http",
      "url": "https://mcp.apify.com?tools=sfoln/us-address-enrichment"
    }
  }
}

POST https://api.apify.com/v2/actors/sfoln~us-address-enrichment/runs?maxTotalChargeUsd=1
GET  https://api.apify.com/v2/actor-runs/{runId}            # until status is SUCCEEDED
GET  https://api.apify.com/v2/datasets/{defaultDatasetId}/items?format=json

Authenticate with an Apify API token. MCP clients can instead sign in with OAuth when prompted. Example prompt for an agent: Find the census tract, county FIPS code, congressional district and FEMA flood zone of 1600 Pennsylvania Ave NW, Washington, DC 20500.

Input fields

US addresses (or latitude,longitude points) to geocode with the US Census Bureau geocoder. Each input produces one dataset record with a `status` field; only matched addresses are charged.

{
  "addresses": [
    "1600 Pennsylvania Ave NW, Washington, DC 20500"
  ]
}

One record per input item

Records land in the run's dataset; a synchronous call returns them directly. Each has a status (ok is charged; everything else is free) and a charged flag. The run's OUTPUT record totals items and charges.

{
  "input": "1600 Pennsylvania Ave NW, Washington, DC 20500",
  "status": "ok",
  "charged": true,
  "chargedEvent": "address",
  "chargedAddOns": [
    "flood-zone"
  ],
  "source": "us-census-geocoder",
  "fetchedAt": "2026-10-14T22:38:12.176Z",
  "inputType": "address",
  "matchType": "exact",
  "matchedAddress": "1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500",
  "latitude": 38.898702605245,
  "longitude": -77.035189204737,
  "addressComponents": {
    "houseNumber": "1600",
    "street": "PENNSYLVANIA AVE NW",
    "streetName": "PENNSYLVANIA",
    "city": "WASHINGTON",
    "state": "DC",
    "zip": "20500"
  },
  "tigerLineId": "76225813",
  "tigerLineSide": "L",
  "stateFips": "11",
  "stateCode": "DC",
  "stateName": "District of Columbia",
  "countyFips": "11001",
  "countyName": "District of Columbia",
  "tractGeoid": "11001980000",
  "tractCode": "980000",
  "blockGroupGeoid": "110019800001",
  "blockGroupCode": "1",
  "blockGeoid": "110019800001034",
  "blockCode": "1034",
  "congressionalDistrict": {
    "geoid": "1198",
    "code": "98",
    "name": "Delegate District (at Large)",
    "congress": 120
  },
  "stateLegislativeDistrictUpper": {
    "geoid": "11002",
    "code": "002",
    "name": "Ward 2"
  },
  "stateLegislativeDistrictLower": null,
  "place": {
    "geoid": "1150000",
    "code": "50000",
    "name": "Washington city",
    "type": "incorporated_place"
  },
  "countySubdivision": {
    "geoid": "1100150000",
    "code": "50000",
    "name": "Washington city"
  },
  "zcta": "20006",
  "cbsa": {
    "geoid": "47900",
    "code": "47900",
    "name": "Washington-Arlington-Alexandria, DC-VA-MD-WV Metro Area",
    "type": "metropolitan"
  },
  "csa": {
    "geoid": "548",
    "code": "548",
    "name": "Washington-Baltimore-Arlington, DC-MD-VA-WV-PA CSA"
  },
  "metropolitanDivision": {
    "geoid": "4790047764",
    "code": "47764",
    "name": "Washington, DC-MD Metro Division"
  },
  "schoolDistrict": {
    "geoid": "1100030",
    "code": "00030",
    "name": "District of Columbia Public Schools",
    "type": "unified"
  },
  "urbanArea": {
    "geoid": "92242",
    "code": "92242",
    "name": "Washington--Arlington, DC--VA--MD Urban Area"
  },
  "puma": {
    "geoid": "1100106",
    "code": "00106",
    "name": "District of Columbia (South Central) PUMA"
  },
  "censusRegion": "South",
  "censusDivision": "South Atlantic",
  "vintage": "Current_Current",
  "floodZone": {
    "zone": "X",
    "zoneSubtype": "AREA OF MINIMAL FLOOD HAZARD",
    "sfha": false,
    "riskLevel": "minimal",
    "baseFloodElevation": null,
    "depth": null,
    "elevationUnit": null,
    "verticalDatum": null,
    "dfirmId": "110001",
    "panel": "1100010018C",
    "panelEffectiveDate": "2010-09-27",
    "panelType": "Countywide, Panel Printed",
    "otherZones": []
  }
}

Questions

Which addresses can it geocode?

Street addresses in the 50 states, DC and Puerto Rico that are in the Census Bureau's address ranges (TIGER/Line). PO boxes, rural route boxes and addresses outside the US are not matched; they come back as no_match and are not charged.

What does matchType mean?

exact: the match agrees with every part you gave (house number, street, directional, street type, city or ZIP, state). non_exact: the Census corrected or completed something, for example a missing street type or a different ZIP, so check matchedAddress. tie: the address fits several places (not charged; the candidates are listed). no_match: nothing found (not charged).

Is a ZCTA the same as a ZIP code?

Almost: a ZIP Code Tabulation Area is the Census Bureau's area approximation of a 5-digit ZIP code, so it can differ from the ZIP in the mailing address (addressComponents.zip).

How precise is the flood zone?

It is the FEMA National Flood Hazard Layer zone at the geocoded point. Census coordinates are interpolated along the street segment, so they can be a few lots away from the building; near a zone boundary otherZones lists the neighbouring zone.

Related APIs

• geocode-address Geocoding API – Address to Coordinates$0.80 / 1,000
• npi-lookup NPI Lookup & OIG Exclusion Check$2 / 1,000
• weather-forecast Weather Forecast API$1 / 1,000
• historical-weather Historical Weather Data API$0.20 / 1,000

This page for agents

• /actors/us-address-enrichment.json — this API as JSON
• /actors/us-address-enrichment.md — this API as Markdown
• /catalog.json — the whole catalogue