UK Postcode Tessellation Inspector

Geolytica UK postcode polygons samples — UK Postcode Boundaries, Complete National Tessellation on ADX

Polygon colours only separate neighbours. Confidence = the share of a postcode's geocoded observations that fall inside its polygon. Postcodes whose locations are within 10 m of each other (usually one building) form a stack group; postcodes at the same location (within 1 m) share one polygon. Boundaries follow roads, railways and rivers (v2.1). Display coordinates rounded to 6 decimals. Road, rail, water and land-mask geometry contains OS data © Crown copyright and database right 2026 and OSNI public sector information (OGL v3.0). © Geolytica Inc. — geocode.xyz