Writing
Guides and notes
Working code for geocoding, Census geography, and property data — the things people actually ask us how to do.
Enrich a CSV of addresses with Census demographics (Python)
Turn a CSV of US addresses into rooftop coordinates, the 15-digit Census block, and official Census demographics in about 40 lines of Python.
Geocode a large address list (there is no batch endpoint, and that is fine)
How to push a few hundred thousand addresses through a per-address geocoding API without tripping rate limits, using deduplication, a bounded worker pool, and a resumable cache.
Cache-first geocoding, and when to re-geocode
A geocode is a slow, paid, mostly-idempotent lookup. Treat it like one - store the result, key it properly, and re-run it only when something that matters has actually changed.
Add rooftop geocoding to a Django app
A model field, a service function, a management command for backfill, and the mistakes that make geocoding slow or wrong in a Django request cycle.
Follow along with your own key
Every guide runs on the free tier — 5,000 geocodes a month.
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