city proper population city limits in millions  density per km square                           urban area  population urban area in millions                        metro area population metro area in millions
0          london , uk                                7.5                   4761                       paris , france                               10.1                       london , uk                           12 - 14
1     berlin , germany                                3.4                   3815                          london , uk                                8.5                    paris , france                              11.7
2       madrid , spain                                3.1                   1985                       madrid , spain                                5.5            rhine - ruhr , germany                              10.2
3         rome , italy                                2.7                   5198                       ruhr , germany                                5.3            randstad , netherlands                               7.0
4       paris , france                                2.2                  24672                    barcelona , spain                                4.5                    madrid , spain                               5.8
5  bucharest , romania                                1.9                   9131                        milan , italy                                3.8                 barcelona , spain                               5.3
6    hamburg , germany                                1.8                   2310                     berlin , germany                                3.7                     milan , italy                               4.3
7      warsaw , poland                                1.7                   3258  rotterdam - the hague , netherlands                                3.3                  berlin , germany                               4.3
8   budapest , hungary                              1 , 7                   3570                      athens , greece                                3.2  frankfurt rhine - main , germany                               4.1
9     vienna , austria                                1.7                   3931                       naples , italy                                2.9                   athens , greece                               3.9

Table as JSON:
{"city proper":{"0":"london , uk","1":"berlin , germany","2":"madrid , spain","3":"rome , italy","4":"paris , france","5":"bucharest , romania","6":"hamburg , germany","7":"warsaw , poland","8":"budapest , hungary","9":"vienna , austria"},"population city limits in millions":{"0":"7.5","1":"3.4","2":"3.1","3":"2.7","4":"2.2","5":"1.9","6":"1.8","7":"1.7","8":"1 , 7","9":"1.7"},"density per km square":{"0":4761,"1":3815,"2":1985,"3":5198,"4":24672,"5":9131,"6":2310,"7":3258,"8":3570,"9":3931},"urban area":{"0":"paris , france","1":"london , uk","2":"madrid , spain","3":"ruhr , germany","4":"barcelona , spain","5":"milan , italy","6":"berlin , germany","7":"rotterdam - the hague , netherlands","8":"athens , greece","9":"naples , italy"},"population urban area in millions":{"0":10.1,"1":8.5,"2":5.5,"3":5.3,"4":4.5,"5":3.8,"6":3.7,"7":3.3,"8":3.2,"9":2.9},"metro area":{"0":"london , uk","1":"paris , france","2":"rhine - ruhr , germany","3":"randstad , netherlands","4":"madrid , spain","5":"barcelona , spain","6":"milan , italy","7":"berlin , germany","8":"frankfurt rhine - main , germany","9":"athens , greece"},"population metro area in millions":{"0":"12 - 14","1":"11.7","2":"10.2","3":"7.0","4":"5.8","5":"5.3","6":"4.3","7":"4.3","8":"4.1","9":"3.9"}}