Official sources

Opportunity Zone Map Data Sources

This site uses federal, state, and census-tract source materials to help visitors research Opportunity Zone map questions. These links are the starting point for checking tract lists, geocoding an address, and reading agency guidance.

Opportunity Zone status is tied to census tracts, not ZIP codes. Use the Census Geocoder to identify a tract for a specific address, then compare that tract with the relevant QOZ source materials.

Source category

IRS

Federal tax guidance and frequently asked questions for Opportunity Zone research.

IRS Opportunity Zones overview IRS overview page for Opportunity Zone tax topics.
IRS Opportunity Zones FAQ Frequently asked questions that help frame non-advisory content.
IRS Notice 2018-48 Original 2018 designated QOZ list notice.

Source category

U.S. Treasury

Federal policy, data transparency materials, and nomination guidance.

Treasury Qualified Opportunity Zones hub Treasury data transparency hub and guidance links.
OZ 2.0 eligibility criteria PDF Treasury criteria document for 2027 nomination research.

Source category

HUD

HUD overview, GIS dataset references, and map resource entry points.

HUD Opportunity Zones overview HUD overview page with program context and tract count references.
HUD Opportunity Zones map resource HUD map resource entry point for visual tract exploration.
HUD ArcGIS dataset ArcGIS dataset page used for source-backed map research.

Source category

CDFI Fund

Designated tract lists, shapefiles, CIMS instructions, and visualization guidance.

CDFI Fund Opportunity Zones resources CDFI resource hub with designated QOZ files and related links.
Designated QOZ spreadsheet Spreadsheet of designated QOZ census tracts updated in 2018.
CDFI CIMS CDFI mapping-system entry point referenced in downloaded source notes.

Source category

U.S. Census Bureau

Address-to-census-tract lookup documentation used before matching a tract to QOZ source materials.

Census Geocoder documentation Documentation for geocoding an address to geography such as a census tract.
Census Geocoder API REST API documentation for technical address-to-tract workflows.

Source category

State Sources

State agency pages and state-provided files used for first-version state research pages.

California GO-Biz Opportunity Zones California timeline, criteria, and state program context.
California Department of Finance Opportunity Zones California designated tract workbook, PDF, shapefile, and KML references.
Texas Governor Opportunity Zones Texas state page for Opportunity Zone process and criteria.

Local downloaded reference set

The project keeps local copies of selected pages, PDFs, spreadsheets, shapefiles, and competitor references in the research source folder for editorial verification during site buildout.

Important limitation

This site organizes source paths and research context. It does not make property-level tax, legal, investment, or compliance decisions.

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