At the time of the United Kingdom Census 2001, the Leeds urban subdivision occupied an area of and had a population of 443,247; making it the fourth-most populous urban subdivision within England and the fifth largest within the United Kingdom. The population density was , slightly higher than the rest of the West Yorkshire Urban Area. It accounts for 20% of the area and 62% of the population of the City of Leeds. The population of the urban subdivision had a 100 to 93.1 female–male ratio. Of those over 16 years old, 39.4% were single (never married) and 35.4% married for the first time. The urban subdivision's 188,890 households included 35% one-person, 27.9% married couples living together, 8.8% were co-habiting couples, and 5.7% single parents with their children. Leeds is the largest component of the West Yorkshire Urban Area and is counted by Eurostat as part of the Leeds-Bradford larger urban zone. The Leeds travel to work area in 2001 included all of the City of Leeds, a northern strip of the City of Bradford, the eastern part of Kirklees, and a section of southern North Yorkshire; it occupies .