c0mm0.com — the continuously verified register of European data

Cross-source linking

Linking identifiers

The shared keys that let data be joined across French public sources — a parcel number, an INSEE commune code, an IRIS zone, a BAN address id, an RNB building id, a SIREN/SIRET. For each, this catalog shows how many sources expose it, under which raw field names, and whether it can be used as a filter in API requests (useful for sequential, drill-down calls). It's the map we'll link data with.

Based on 8,218 French sources with a classified field, out of 12,424 currently profiled. Updated 2026-08-16 13:45 UTC.

Territorial — administrative geography

INSEE COG codes that pin data to a commune, département, région or EPCI.

EPCI / intercommunalité (SIREN)

163

sources · 9 field names

join key150 joinable2 callable161 filterable

INSEE / DGCL (BANATIC)

Code commune INSEE (COG)

1067

sources · 33 field names

join key961 joinable20 callable1053 filterable

INSEE (Code Officiel Géographique)

Code département

575

sources · 15 field names

join key504 joinable20 callable561 filterable

INSEE (Code Officiel Géographique)

Code région

273

sources · 10 field names

join key231 joinable5 callable263 filterable

INSEE (Code Officiel Géographique)

NUTS code

1

source · 1 field name

join key1 callable1 filterable

Eurostat (NUTS)

LAU code

16

sources · 5 field names

join key7 callable10 filterable

Eurostat (LAU)

GSS code (UK ONS)

13

sources · 5 field names

join key7 joinable7 filterable

Office for National Statistics (GSS)

Regionalschlüssel (DE ARS)

4

sources · 1 field name

join key1 callable4 filterable

Statistisches Bundesamt (Destatis)

Gemeindeschlüssel (DE AGS)

26

sources · 3 field names

join key2 joinable25 filterable

Statistisches Bundesamt (Destatis)

Country code (ISO 3166-1)

59

sources · 5 field names

6 joinable4 callable10 filterable

ISO 3166 / Eurostat

Code postal

515

sources · 9 field names

482 joinable3 callable505 filterable

La Poste

Statistical zoning

Fine-grained census geography (IRIS).

IRIS (zone statistique)

55

sources · 12 field names

join key38 joinable53 filterablecomposite

INSEE

Cadastre

Land parcels and their components.

Parcelle cadastrale (IDU)

30

sources · 11 field names

join key16 joinable1 callable28 filterablecomposite

DGFiP / IGN (cadastre, API Carto)

Section cadastrale

35

sources · 4 field names

32 joinable1 callable34 filterable

DGFiP / IGN

Buildings

Building-level pivot keys (RNB, BD TOPO).

Identifiant RNB (bâtiment)

11

sources · 4 field names

join key6 joinable11 filterable

RNB (CSTB / IGN)

Cleabs (IGN BD TOPO)

4

sources · 1 field name

join key4 joinable4 filterable

IGN (BD TOPO)

Identifiant bâtiment (générique)

1234

sources · 2 field names

7 filterable

varies

Addresses

Postal/address references (BAN, FANTOIR).

Code FANTOIR (voie)

0

sources

join key

DGFiP

Identifiant adresse BAN

12

sources · 4 field names

join key9 joinable1 callable10 filterable

BAN (Base Adresse Nationale)

Adresse (texte)

991

sources · 224 field names

1 callable962 filterable

varies

Organisations

Legal units and establishments (SIREN/SIRET).

SIRET (établissement)

363

sources · 59 field names

join key280 joinable34 callable345 filterable

INSEE (SIRENE)

SIREN (unité légale)

171

sources · 41 field names

join key112 joinable33 callable161 filterable

INSEE (SIRENE)

EU Transparency Register ID

0

sources

join key

European Commission / Parliament

Coordinates & geometry

Spatial linking via points or geometry.

Coordonnées (lat/lon WGS84)

2562

sources · 82 field names

join key394 joinable8 callable384 filterablecomposite

WGS84 (EPSG:4326)

Géométrie

4179

sources · 16 field names

join key63 joinable1 callable3122 filterable

OGC / GeoJSON

How to read this

  • Joinable counts sources whose real sample values match the key's expected format (e.g. genuine 5-char INSEE codes) — those are directly joinable today; the higher source count is the candidate pool.
  • Coverage is limited to French sources we've already profiled — others appear as they get profiled.
  • “Filterable” is authoritative for Opendatasoft/DataFair facets and inferred structurally for feature services (WFS/OGC API Features/ArcGIS). For plain OpenAPI REST APIs it's unknown, because query parameters aren't captured yet.
  • Field→identifier matching is alias/pattern-based — it may miss exotic spellings; composite keys (parcel, IRIS, lat+lon) are flagged but not auto-assembled.