According to the Office for National Statistics, at the time of the United Kingdom Census 2001, Chadderton (urban-core and sub-area) had a total resident population of 33,001. The population density was , with a 100 to 95.4 female-to-male ratio. Of those over 16 years old, 27.2 per cent were single (never married) 44.5 per cent married, and 8.5 per cent divorced. Chadderton's 13,698 households included 28.8 per cent one-person, 38.7 per cent married couples living together, 8.9 per cent co-habiting couples, and 10.3 per cent single parents with their children. Of those aged 16–74, 35.6 per cent had no academic qualifications.