Blacktown — LGA Conditions Intelligence

Net internal migration stayed positive across all four years but fell sharply — from +4,173 in 2021-22 to +839 in 2024-25, an 80% decline, the steepest deceleration of any LGA built so far in this series. Both arrivals (31,046 → 23,493) and departures (26,873 → 22,654) fell, but arrivals fell faster, closing the gap. This looks like the tail end of the 2021-22 amenity/COVID migration wave the other cohort LGAs in this series avoided.

ERP growth segmented into four phases. Unlike every other LGA in this series, Blacktown shows no boom/stall/recovery pattern at all — growth has run in a tight 12–16% band every phase since 2001, the most consistent trajectory found so far.

Natural increase alone (4,000) is nearly five times the net internal migration figure (839) — Blacktown’s population growth is overwhelmingly births-driven, not internal-migration-driven, the only LGA in this series where that’s true. Against 2,476 approvals in 2024-25, the LGA is adding roughly one dwelling for every 1.8 residents of net inflow (internal migration + natural increase combined, ≈4,839 persons, ≈2,016 implied households at 2.4 persons/household) — a materially tighter supply picture than the migration-only read would suggest.

The Census unoccupied dwelling rate counts dwellings recorded as unoccupied on Census night — it is not a market vacancy rate. Blacktown’s 5.0% is the lowest of any LGA in this series, consistent with a tight, high-demand outer-Sydney market rather than a holiday-home or retirement one.

• Bedrock figure is population-weighted, not a simple average of suburbs. Readings are on APN Bedrock™ methodology v1.1. Blacktown’s population-eligible localities (344,336 residents across 44 localities) produce a population-weighted mean of 44.4 on node 24110 — a simple, unweighted average gives 43.7, essentially no gap. Blacktown is one of several LGAs in this series where the two conventions nearly agree, which shows the unweighted/weighted discrepancy is context-dependent, not universal — it’s largest where suburb-level scores vary widely with population size, smallest where they don’t.
• Classification badge is provisional and hand-applied. “Sustained Growth, Internal Migration Sharply Decelerating” reflects the two-track pattern here (strong overall growth, sharply declining internal-migration component) — it deliberately avoids the “Reversing” label used elsewhere in this series since net internal migration has stayed positive throughout, not turned negative. The platform’s formal 4-way classification query has not been ratified.
• No crime/safety data included in this version. APN Sentinel™ crime-pillar data (node 24121/24122) exists at suburb grain nationally but carries open, jurisdiction-specific data-quality caveats not yet resolved platform-wide — deliberately excluded from this card rather than presented with unresolved caveats attached.
• Demographic profile is 2021 Census vintage.
• Card format approved 19 August 2026; the Bedrock population-weighting convention used above was adopted platform-wide in October 2026.