The West Yorkshire Built-up Area, previously known as the West Yorkshire Urban Area, is a term used by the Office for National Statistics (ONS) to refer to a conurbation in West Yorkshire, England, based on the cities of Leeds, Bradford and Wakefield, and the large towns of Huddersfield and Halifax.

It is the fourth largest urban area in the United Kingdom.

However, it excludes other towns and villages such as Featherstone, Normanton, Castleford, Pontefract, Hemsworth, Todmorden, Hebden Bridge, Knottingley, Wetherby and Garforth which, though part of the county of West Yorkshire, are considered independently.

The ONS partitions the area down into 39 sub-divisions:[1] Three further subdivisions are given[2] with no population numbers as they are present or former industrial areas with no resident population.

Rawdon is the subdivision name for Horsforth Vale, on which a former industrial plant was redeveloped for housing from 2010, too late to be recorded for the 2011 census.