Skip to main content
EN/JA
NATIONAL TOPKOUSOU 0
scope-macro · NATIONAL
MACHIKARTE / Open Local Assembly Data

Know your local council.
Change what matters.

KOUSOU 0 is a structured-data platform for Japan's local councils, financial reports, and procurement data. We analyze minutes, budgets, and bid records from more than 1,700 municipalities and publish scores under Creative Commons Attribution 4.0 International (CC BY 4.0, commercial use permitted with attribution) — free for journalism, research, and civic use.

What KOUSOU 0 covers

Assembly minutes analysis

QQS · RQS · AHS scores

Deferral Rate (Sakiokuri-ritsu)

Non-committal response ratio

Fiscal transparency

Revenue, expenditure, bond ratios

Procurement patterns

Bidder concentration metrics

Who uses KOUSOU 0

KOUSOU 0 provides data infrastructure supporting journalists, researchers, and public officials. We offer a dedicated channel for each use case.
Press and journalists
Exclusive stories, custom data cuts, citation templates, and commentator referrals.
/en/press →
Research institutions
Joint research, contributed reports, dataset contracts, Advisory Board.
/partnerships →
Municipalities
Official account verification, data correction requests, council bulletin citation guide.
/for-municipalities →
Developers and data users
CC BY 4.0 (commercial use permitted), CSV / API, embed widgets, reproducible SQL — all open.
/en/developers →

What KOUSOU 0 does not publish

We explicitly list features that are technically possible but intentionally excluded on grounds of mission, ethics, or legal requirements.

Features we exclude (with reasons)

  • Municipal "creditworthiness ranking" or "investment-grade list" — ranking municipalities by superiority violates our design principles.
  • Scores aggregated by political party or faction filter — would compromise journalistic neutrality.
  • Labels such as "bad council" or "outstanding lawmaker" — we do not apply value labels.
  • Individual lawmaker scores or rankings— pending legal review with counsel under Japan's public-election law.
  • Bulk data provision for AI training — subject to individual negotiation.
Explore KOUSOU 0
Press
Press inquiries and citation templates →
Researchers
Research partnerships and joint studies →
Developers
API / CSV / SDK →
Indicators
Deferral Rate definition and limits →
Data coverage
Coverage by prefecture →
Japanese version
構想0区 日本語版 →
Related sites

Related publications from the KOUSOU 0 editorial team.

The KOUSOU 0 editorial team also publishes related thematic sites. Explore them below.

public0
Public Asset Utilization Media

Case studies, policy proposals, and municipal interviews on idle public asset utilization.

public0.isvd.or.jp →

About KOUSOU 0

Discover & use

Contact (forms)

Numbers & latest

  • Councils covered1,759 / 1,788 (98% coverage)
  • Statements indexed255,598,616
  • Meetings509,342
  • Data aggregated2026-09-21
  • Monthly newsletter