Area measurements used are the Standard Area Measurements (SAM) created using standard methodologies by ONS Geography for key geographies in the UK. These are land measurement figures defined by topographic boundaries (coastline and inland water) as at the end of 2011. Area measurements used are in hectares - the metric unit of area defined as 10,000 square metres or approximately 2.47 acres - there are 100 hectares in 1 km2.
The area measurements in this table may not sum due to rounding.
Population density:
Population density is the number of usual residents per hectare. Population density for each area is calculated using aggregations of the area measurements (to two decimal places) for each Output Area that has been best-fitted to each higher area. This means that some figures may not match exactly the population densities for local authorities published in the September 2012 census release which used exact area measurements for each local authority.
The rounded area measurements provided in this table are for reference only. Any population density derived using these rounded figures may not match the population density included in the table.



