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Transparent data sources

Adatka combines publicly released and openly licensed sources. A response can be built from several sources; the response lists which ones, and the role and licence of each source are described on the Sources and licences page.

Sources

KSH Gazetteer (Helységnévtár)

Official settlement names, settlement identification codes and administrative classification.
Source: Hungarian Central Statistical Office (Központi Statisztikai Hivatal) · Use: under the KSH's published terms, with attribution

GeoNames

Additional settlement names, postal codes, coordinates and time zone data.
Licence: CC BY 4.0

OpenStreetMap

Street, address and geometry data, depending on the coverage available.
OpenStreetMap contributors · Licence: ODbL

Magyar Posta Partner Extra

Postal code and street data, based on the dataset of 21 September 2026. If this layer also contributed to the match, Magyar Posta appears in the response's list of sources.

National Election Office (Nemzeti Választási Iroda) — polling district address dataset

Checking that a house number exists, without coordinates.
Source: Nemzeti Választási Iroda, Körzetállomány (16 January 2026), valasztas.hu. We keep the source dataset unchanged; Adatka does the matching of street names. The National Election Office confirmed the use — with attribution — on 2 October 2026.

Data status: Magyar Posta — dataset of 21 September 2026 · KSH Gazetteer (Helységnévtár) — 2025 edition · OpenStreetMap — extract of 16 August 2026 · GeoNames — download of 16 August 2026 · National Election Office (Nemzeti Választási Iroda) — dataset of 16 January 2026

Detailed list of sources and licences: Sources and licences