Free, documented Opportunity Zone data compiled from the official Treasury, IRS, CDFI Fund and Census files. Use it with attribution to opportunityzones.help.
Tables
| File | What it holds | Size |
|---|
Models and calendars
- OZ 2.0 vs paying tax now (Excel model): the same math as the benefit calculator, with live formulas.
API and MCP
The same data is available as a JSON API and as an MCP server for AI agents. See the API documentation.
Known limitations
- 2018 zones are 2010 census tracts; the 2027 round uses 2020 tracts. Tract numbers that match across the two vintages do not always cover the same land.
- 2027 status is "certified" only where an official list names the tracts. Until then a tract shows as eligible or nominated.
- Census statistics are survey estimates with margins of error; suppressed values are left blank, never estimated.
Common questions
Where does this Opportunity Zone data come from?
From the official files published by Treasury, the IRS, the CDFI Fund and the Census Bureau. Each file and its retrieval date is listed under data sources on this page.
Can I use this data?
Yes. The underlying government data is public. Our compiled files are free to use with attribution to opportunityzones.help.