BostonUnited States |
BeijingChina |
625 087
(2011) |
625 087
(2011)
21 148 000
(2013) |
21 148 000
(2013) |
232 km2
|
232 km2
16 411 km2
|
16 411 km2
|
2 694.34
/km2 |
2 694.34/km2
1 288.65/km2
|
1 288.65
/km2 |