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Address → Census block API

Turn any address into its Census block — in one API call

Weganar returns the 15-digit 2020 Census block GEOID (and tract, block group, and county FIPS) for every US address, at rooftop accuracy. Skip the flaky federal batch geocoder and the PostGIS pipeline. One POST, one JSON response, results you own.

Get 5,000 free geocodes/month

The problem

HMDA reporting, CRA analysis, fair-lending review, demographic enrichment, public-health research — all need addresses tied to Census geographies. Today that means the Census Bureau's geocoder (slow, rate-limited, down at filing season), a home-grown PostGIS + TIGER pipeline you maintain forever, or Google/Mapbox (which don't return Census geography at all, and you can't store what they do return).

The fix

The 15-digit block GEOID on every rooftop/parcel result — state (2) + county (3) + tract (6) + block (4). Slice it for tract or block group; the county FIPS is right there in fips. Rooftop accuracy, production reliability, and results you can store in your warehouse indefinitely.

curl -X POST "https://weganar.com/api/v1/geocode" \
  -H "X-API-Key: gck_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"address": "1600 Pennsylvania Ave NW, Washington, DC 20500"}'
{
  "standardizedAddress": "1600 PENNSYLVANIA AVE NW, WASHINGTON, DC 20500",
  "lat": 38.897675,
  "lon": -77.036547,
  "fips": "11001",
  "censusBlock": "110010062021031",
  "locationCode": "ROOFTOP"
}

Why Weganar for Census geocoding

  • Census block on ~100% of rooftop/parcel results. Not a paid add-on, not a separate call.
  • Rooftop accuracy. Block assignment is only as good as the point — we place at the rooftop, not the street centroid.
  • You own the output. No caching restrictions — store GEOIDs in your warehouse indefinitely.
  • Enrich in the same place. /api/v1/demographics returns 2020 Census + ACS data for the same address on credits.

Built for the compliance use case

HMDA and fair-lending workflows need the tract/block for every application address, reproducibly, at filing volume. Weganar gives you a stable, storable GEOID per address and a clear audit trail (matchCode, pointReason) for how each point was resolved. Informational geocoding for analysis and enrichment — confirm suitability for your specific regulatory filing requirements.

Start free — Census block included

5,000 geocodes/month, no card. Every result carries the block GEOID.

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