Data Sources & Methodology

Sources

• Picture of Subsidized Households (FY2025) — HUD's administrative census of assisted properties: unit counts, occupancy, tenant-paid rents, incomes, waiting times. huduser.gov/datasets/assthsg.html
• LIHTC Database (2024) — HUD's census of tax-credit properties placed in service since 1987. huduser.gov/lihtc
• Fair Market Rents (FY2026) — county/metro rent benchmarks effective October 2025. huduser.gov/datasets/fmr.html

Processing

1. Duplicate buildings receiving both HUD project-based aid and tax credits are merged into single profiles carrying both program tags.
2. Name/address fields are standardized (title case, ZIP-5 extraction); coordinates come from HUD geocodes.
3. Suppressed values (negative sentinels in HUD data) become blanks, never zeros.
4. City aggregates sum property-level records; medians use HUD-reported values only.

Known limitations

• Administrative data lags reality by 6–18 months; treat rents/waits as indicative.
• Voucher (tenant-based) inventory isn't tied to addresses, so it appears in guides, not property pages.
• Some LIHTC records lack exact addresses; those show city/ZIP level detail.

Update cadence

Full refresh annually after HUD releases; spot corrections continuously.