CologneGermany |
San DiegoUnited States |
1 017 155
(2011) |
1 017 155
(2011)
1 366 865
(2008) |
1 366 865
(2008) |
405 km2
|
405 km2
963 km2
|
963 km2
|
2 511.49
/km2 |
2 511.49/km2
1 419.38/km2
|
1 419.38
/km2 |