aus-identity 0.1.0

Cross-source join keys for Australian public data — postcode ↔ state crosswalks, state-code normalisation, more coming. Foundation for tools that talk to multiple AU government data sources.

aus-identity

Cross-source join keys for Australian public data. The foundation layer for tools that need to talk to multiple AU government data sources at once (ABS demographics + ATO income + APRA banking + au-weather climate + ASIC company register + RBA monetary stats), or for any application that has to map between Australia's postcode and state/territory conventions.

What it does today (v0.1.0)

• Postcode → state: postcode_to_state("2000") → "NSW". Handles the three ACT-inside-NSW carve-outs (0200-0299, 2600-2618, 2900-2920) correctly.
• Postcode normalisation: accept "2000", 2000, " 2000 ", "0800", 800 — all return canonical 4-digit string form.
• Postcode validation: is_valid_postcode(x) returns a boolean and never raises — safe for filtering arbitrary input.
• State code normalisation: normalize_state("nsw") / normalize_state("New South Wales") / normalize_state("AU-VIC") / normalize_state("Tassie") → canonical short code.
• Full state name: state_full_name("NSW") → "New South Wales".

Install

pip install aus-identity
# or
uv add aus-identity

Zero runtime dependencies. Pure Python. Wheel is < 20 KB.

Quick examples

from aus_identity import (
    postcode_to_state,
    normalize_postcode,
    is_valid_postcode,
    normalize_state,
    state_full_name,
)

# Postcode → state
postcode_to_state("2000")      # "NSW" (Sydney CBD)
postcode_to_state("3000")      # "VIC" (Melbourne CBD)
postcode_to_state("2600")      # "ACT" (Parliament House — not NSW)
postcode_to_state("0800")      # "NT"  (Darwin)
postcode_to_state(6000)        # "WA"  (int input also accepted)

# Normalisation
normalize_postcode("  2000  ")  # "2000"
normalize_postcode(800)         # "0800" (3-digit shorthand padded)

# Validation (never raises)
is_valid_postcode("2000")       # True
is_valid_postcode("ABCD")       # False
is_valid_postcode(None)         # False

# State normalisation
normalize_state("nsw")                  # "NSW"
normalize_state("New South Wales")      # "NSW"
normalize_state("AU-VIC")               # "VIC"
normalize_state("Tassie")               # "TAS"
normalize_state("New_South_Wales")      # "NSW" (LLM payload form)

# Full names
state_full_name("NSW")          # "New South Wales"
state_full_name("act")          # "Australian Capital Territory"

Why this exists

The AU public-data MCP stack (abs-mcp, rba-mcp, ato-mcp, apra-mcp, aihw-mcp, asic-mcp, au-weather-mcp) lets an LLM agent talk to any single Australian government data source. But each agency uses its own identifier conventions:

• ABS uses ASGS region codes (1GSYD for Greater Sydney, 101011001 for an SA1)
• ATO uses 4-digit postcodes
• APRA uses ABNs
• ASIC uses licence numbers
• au-weather uses location keys and lat/long
• RBA uses F-table IDs and series codes

To use any two of these together — "what's the median household income vs unemployment rate in postcode 2000?" — something has to translate between identifier systems. aus-identity is that something. v0.1 starts with the most-used crosswalk (postcode ↔ state); v0.2+ will extend to ASGS / ABN / ANZSIC / ANZSCO.

Source of truth

Postcode → state mappings are sourced from Australia Post's public postcode boundary publication and cross-checked against ABS ASGS Edition 3 (2021) state-of-residence assignments. The three ACT-inside-NSW ranges and the Vic/Qld PO Box blocks are handled explicitly. Coverage is 99%+ of currently-active AU postcodes.

For exact suburb-level precision (e.g. which side of an ACT/NSW boundary a specific delivery address falls), use ABS ASGS sub-state codes — planned for v0.2 of this package.

Roadmap

• v0.1.0 (this release) — postcode + state crosswalks
• v0.2 — ASGS 2021 sub-state crosswalk (SA1 ↔ SA2 ↔ SA3 ↔ SA4 ↔ GCCSA ↔ state)
• v0.3 — ABN ↔ ACN ↔ ACNC charity-ID crosswalk
• v0.4 — ANZSIC industry codes + ANZSCO occupation codes

License

MIT.