Large Scale vector boundary area

OSNI Large Scale vector boundary data is made up of a number of distinct historic and administrative boundaries.

Although county and townland are no longer official administrative boundaries, they are still widely used. These data are accurate at property and street level making them suitable for detailed analysis purposes.

Key features

  • can be used with all other OSNI products
  • all data is fully attributed and users can tailor the datasets to suit their own requirements
  • basic units of spatial information represented as polygons
  • available in MapInfo and ESRI formats
  • can be used with all industry standard GIS and CAD packages

Datasets are available as full Northern Ireland coverage only. They can be supplied as a full set or individually. Datasets include:

  • counties
  • district electoral areas
  • Local Government Districts
  • Parliamentary Constituencies
  • electoral wards
  • NI Outline


  • statistical research
  • market analysis
  • internet mapping
  • demographic analysis
  • this data is now available under OSNI Open Data

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