Based on 'the number of employees and students over the age of fifteen, according to permanent residence and destination' from the 2000 national census, the population of the Urban Employment Area (an area where at least 10% of the suburban population commutes to the central city), centered on the cities of Osaka, Higashi-Osaka, Kadoma, and Moriguchi, is 12,120,000.
2000年（平成12年）国勢調査「常住地による従業・通学市区町村別15歳以上就業者及び15歳以上通学者数」に基づいた、大阪市・東大阪市・門真市・守口市を中心市とする都市雇用圏（10%通勤圏）の人口は約1212万人。