As of the 2001 UK census, Salford had a population of 72,750. The 2001 population density was 9,151 per mi2 (3,533 per km2), with a 100 to 98.4 female-to-male ratio. Of those over 16 years age, 44.0% were single (never married) and 36.7% married. Salford's 32,576 households included 44.1% one-person, 22.0% married couples living together, 7.6% were co-habiting couples, and 13.3% single parents with their children. Of those aged 16–74, 37.3% had no academic qualifications, similar to that of 35.5% in all of the City of Salford but significantly higher than 28.9% in all of England. 15.9% of Salford's residents aged 16–74 had an educational qualification such as first degree, higher degree, qualified teacher status, qualified medical doctor, qualified dentist, qualified nurse, midwife, health visitor, etc. compared to 20% nationwide.