# Map data

Postal boundaries: OpenStreetMap contributors, extracted by yetzt/postleitzahlen, release 2026.02 (ODbL). https://github.com/yetzt/postleitzahlen/releases/tag/2026.02

Place names / state mapping: GeoNames via zauberware/postal-codes-json-xml-csv (CC BY 4.0). https://github.com/zauberware/postal-codes-json-xml-csv

State outlines: isellsoap/deutschlandGeoJSON, 2_bundeslaender/3_mittel.geo.json. https://github.com/isellsoap/deutschlandGeoJSON

Display geometry is projected and simplified; cross-border postcode polygons are clipped to the Baden-Württemberg outline in the map. Boundaries are for orientation, not official postal routing. Downloaded September 2026. Source-derived geometry is provided in map.json.