Recommended research sequence
- Start from the user task.
Choose whether you are researching by ZIP code, state, city, or a
specific address. For a broad first pass, use the
homepage map guide, state hub, or
ZIP page.
- Move from place name to tract.
ZIP codes and city names are useful entry points, but QOZ designations
are tract-based. For a specific address, use the
Census Geocoder documentation
or Census Geocoder API
to understand address-to-tract lookup.
- Compare the tract with source files.
Check CDFI Fund designated QOZ files, Treasury materials, HUD datasets,
and relevant state pages. Use the Data Sources
page as the link directory.
- Separate research from decisions.
A map or tract reference is not professional advice. For tax, legal,
investment, compliance, or transaction questions, review the
Disclaimer and consult a qualified professional.
ZIP lookup versus census tract confirmation
A ZIP code can contain multiple census tracts, and a census tract can
overlap more than one ZIP code. That means ZIP-level research can narrow
the search area, but it should not be treated as the final source for a
property-specific question. The next step is to identify the census tract
for a specific address, then compare that tract with source materials.
Source hierarchy for this site
Federal tax and policy context
IRS and Treasury pages are used for federal QOZ tax framework,
guidance, and nomination-process context.
Designated tract and GIS references
CDFI Fund and HUD resources are used for tract lists, GIS files,
visual map resource paths, and dataset references.
Address-to-tract lookup
Census Bureau Geocoder materials are used to understand how an address
can be translated into geography such as a census tract.
State context
State agency pages are used for state-specific nomination context,
files, program notes, and local map resource entry points.
OZ 1.0 and the next QOZ cycle
First-version research should distinguish the existing designated tract
materials from the newer nomination and eligibility materials that apply
to the next QOZ cycle. The local source set includes HUD context for the
existing program, IRS guidance for state nominations under newer law, and
Treasury eligibility criteria materials for 2027 nomination research.
For current source review, use the
HUD overview,
IRS 2026 state nomination guidance,
and Treasury OZ 2.0 criteria PDF.
Where to go next
This guide is an independent research resource. It does not provide
personalized tax, legal, investment, accounting, or compliance advice.